Volume 89, Issue 5
September 1980, pages 407-514
pp 407-414 September 1980
Ecology ofHeteromastus similis, capitellid, inhabiting the intertidal area of the Vasishta Godavari estuary has been studied for a period of 15 months. Its abundance and distribution in relation to the distance from the river mouth, tidal level, temperature, interstitial salinity, dissolved oxygen, sediment composition and organic matter in the sediment is discussed.
pp 415-418 September 1980
The description of a new species belonging to the genusQuinisulcius Siddiqi, 1971 under the family Tylenchorhynchidae (Eliava, 1964) Golden, 1971 has been reported.
pp 419-429 September 1980
Two major carp hybrids, namely, catla-rohu and rohu-catla, were produced by crossing male catla with female rohu and male rohu with female catla, respectively. The taxonomic characters of the two hybrids were studied and compared with those of the parental species, catla and rohu. The two hybrids were intermediate between the parental species for most of the taxonomic characters. In both the hybrids, the body was deeper than in rohu and the head smaller than in catla. This combination of characters makes the hybrids more desirable breeds than either parent. In both the hybrids, the mouth was terminal and only the lower lip was slightly fringed. They possessed a pair of short maxillary barbels. The two hybrids catla-rohu and rohu-catla resemble each other, the difference being noticed only in a couple of minor characters.
pp 431-439 September 1980
The anatomy of the reproductive systme ofPseudocycnus appendiculatus (Copepoda: Pseudocycnidae) has been described. The system consists of a pair of ovaries, oviducts, cement gland, spermatheca, sperm tube and egg sacs. All except the egg sacs are located in the trunk region.
pp 441-447 September 1980
The male ofPseudocharopinus narcinae (Pillai) is described and illustrated for the first time. All the other known males of the genusCharopinus Kroyer,Pseudocharopinus Kabata,Schistobrachia Kabata,Dendrapta Kabata andCharopinopsis Yamaguti are compared with that ofPseudocharopinus narcinae.
pp 449-456 September 1980
The prismatic and nacreous layers in the shells ofBarbatia obliquata, Modiolus metcalfei, Pinna vexillum andMytilopsis sallei vary in thickness, though they show similar affinity for both basic and acidic dyes. Histochemical evidence revealed that these layers contain proteins as well as acid mucopolysaccharides. Quinone-tanning is observed in the nacreous layer.
pp 457-466 September 1980
Legs of Reduviidae show modifications and specialised structures adapted for their predatory habits and efficient prey capture. The variable forelegs of these insects apparently reflect the correlation between the structure of the legs and the types of prey. The tibial pads or fossula spongiosa are a common feature in the forelegs or fore- and midlegs of most of subfamilies of Reduviidae. The functional morphology of the tibial pads of the forelegs of three insects,Haematorrhophus nigroviolaceus (Reuter),Pirates affinis Serville andTriatoma rubrofasciata (De Geer) has been studied. The oily substance produced by the cushion-like secretory tissue and the minute tenet hairs on them increase the ability to sustain static tension and enhance the gripping efficiency of the legs. Scanning electron micrographs reveal distinct morphological variations among the tibial pads. In addition to the shape and size of the organs, the number, structure and density of the tenet hairs on them markedly vary. The ability of the foretibial pad to sustain static tension on smooth and rough surfaces has been found to differ among the insects studied and this is remarkable in predatory insects.
pp 467-483 September 1980
Effect of castration and oral administration of sex hormones on the specialised apocrine sudoriferous glands of the perineal region and the holocrine sebaceous glands of the flank and oral lip regions of the male musk shrew,Suncus murinus viridescens is investigated. Gonadectomy effected a significant regression and hypotrophy of the sudoriferous as well as sebaceous glandular structures of the shrew. The secretory epithelial cells were depleted and the tubules were devoid of any secretory material at the end of one month of castration. Subsequent administration of methyltestosterone daily for four weeks reactivated all these glands, whereas the gross morphological features of sebaceous glands did not vary at any significant level after treatment with ethinyloestradiol daily for four weeks. However, partial rejuvenation in the cellular structures was noticed in all these glands of shrews orally administered with this heterosexual hormone.
pp 485-491 September 1980
A new species of myxosporidan,Myxobolus vanivilasae n. sp. infecting the fry and fingerlings of cultivable fishCirrhina mrigala (Hamilton) is described.
pp 493-503 September 1980
Eighty three specimens ofLabeo gonius were examined to study the fecundity of the species. The weight of the two ovaries together accounted for 14·71 to 21·87% of the total weight of the fish. Specimens about 1 kg in weight had ovaries weighing about 205·312 g on an average and this worked out to about 19·93% of the total weight of the fish. The average number of eggs per g weight of fish and ovary was 271 and 1424 respectively. The fecundity per kg body weight of fish was 286111. The relationships between standard length and fecundity, total weight and fecundity, ovary weight and fecundity, ovary length and fecundity, ovary volume and fecundity, fish length and ovary weight and fish weight and ovary weight ofLabeo gonius have been determined.
pp 505-514 September 1980
Immunization of guinea pigs with plain insulin for 4 weeks followed by insulin in Freund’s complete adjuvant for a further period of 8 weeks induced a variety of inflammatory changes in the pancreas of the animals. Mononuclear cell infiltration of the islets of Langerhans (insulitis), periductulitis, collagen proliferation and deposition of alcian blue and PAS-reactive mucosubstances in some of the acinar lobules were some of the conspicuous changes observed in the pancreas of all the immunized animals. It is evident that guinea pigs, which are usually resistant to insulitis-inducing manoeuvres, develop more or less well-defined insulitis on prolonged immunization with insulin.