Volume 88, Issue 1
February 1979, pages 1-89
pp 1-12 February 1979
Both the openings of the stomach ofMiniopterus schreibersii are directed cranially and the fundus is large and rounded. The longitudinal layer of muscles is thin but the circular layer is thick particularly at the apex of the fundic caecum. In addition to the usual types of cells, namely pepsinogen cells, parietal cells, surface mucous cells and neck mucous cells, a new type of cell, the interstitial cell of the gastric mucosa, which stains intensely pink with PAS, has been identified for the first time in the gastric glands. In general there is a predominance of neutral mucins particularly in the pyloric region where blebs of mucus are seen to ooze out into the lumen. Acidic mucins are present in moderate amounts in the surface mucous cells at the apex of the fundic caecum.
pp 13-23 February 1979
The common carp,Cyprinus carpio Linn. has been studied for tracing the ossification centres in its skull. A large number of early developmental stages of the embryos and larval forms were sectioned at 10 micra and these sections were stained with Delafield’s haematoxylin and counter-stained with eosin for studying the bones. Alizarine transparencies of various stages were also made. Five stages have been investigated and described.
pp 25-28 February 1979
Effects of the three ganglionic extracts viz., cerebral, pleuropedal and visceral ganglia from active and aestivated snails on glutamate dehydrogenase activity in the foot and digestive gland of activePila globosa were studied. The activation with cerebral ganglia was less when compared with visceral and pleuropedal ganglia in foot but in case of digestive gland, the activation reached with cerebral ganglia extract surpassed all other ganglionic effects. The significance of these findings was discussed.
pp 29-43 February 1979
Five stages of maturity have been delineated forNoemacheilus triangularis Day. Progression of the mode in each stage of maturity has been traced from ova|diameter studies. The size at first maturity for male is around 44·5 mm and for female around 52 mm. Spawning is asynchronous and prolonged. There may be successive spawning during the year. Sexes are present in almost equal numbers. Fecundity is dependent on length and weight of fish and on length and weight of ovary.
pp 45-54 February 1979
The development of oocytes has been traced in detail in the loachLepidocephalus thermalis. The various stages of oocytes are described under distinctive stages namely 1. chromatin nucleolus stage; 2. perinucleolus stage; 3. yolk vesicle stage; 4. primary yolk stage; 5. secondary yolk stage; 6. tertiary yolk stage; 7. migratory nucleus stage; 8. pre-ripening stage; 9. ripe egg stage. The yolk deposition is initiated as minute globules in the extravesicular ooplasm. A yolk nuclous is entirely wanting in any stage of oocyte maturation. The origin of new crops of oocytes and the formation of the micropyle are described. Nature of degeneration of unextruded ripe oocytes has been followed.
pp 55-58 February 1979
The copper and protein concentrations in the blood and in the purified haemocyanin of active and starved slugs were determined. During starvation there is a marked decrease in the haemocyanin concentration in the blood. However the copper protein ratio of the purified haemocyanin of the active and starved slugs remained unchanged suggesting that haemocyanin remains unaltered during starvation.
There is a significant increase of hepatopancreatic copper upon starvation. The hepatopancreas is suggested to store copper during starvation. The results are discussed in the light of the previous works on crustaceans and molluscs.
pp 59-63 February 1979
Out of 2150 specimens of freshwater teleosts observed for the presence of haemoflagellate in their blood only 75 (3·48%) were found to be infected by trypanosomes. Siluroids were infected in higher numbers than others and the infection was found in blood only during winter months.
pp 65-72 February 1979
Drosophila collections of Sahyadri Hill range revealed the occurrence of several known species ofDrosophila in addition to a new species,Drosophila sahyadrii, a member of thesuzukii subgroup of themelanogaster species group of the subgenusSophophora. The distributional pattern of different species is closely related to the nature of the environmental conditions of the localities. The morphology and internal characters of the new species are described. The systematic position and the affinities are discussed.
pp 73-83 February 1979
Six naupliar stages ofBalanus kondakovi were raised under laboratory conditions on a diet ofDunaliella primolecta. The nauplii of this species are generally small, with carapace, caudal spine, abdominal spine and labrum, lacking any special feature that could help in specific identification. However, these features when considered in conjunction with the limb setation help to separate these larvae from those of the others. It is one of the fast metamorphosing barnacle larvae attaining metanauplius stage in about 80 hr.
pp 85-89 February 1979
A new species of histozois myxosporidean,Kudoa tetraspora, infecting the tissue around the optic lobes of a fish,Mugil cephalus is, described. This is the second report of a species ofKudoa from India and the second in the world which establishes around the brain. The cysts range varies from 0·3–1·5 mm in diameter and are attached superficially to the tissue around the optic lobes. The spores are quadrate in polar view each measuring 9·0×9·0 μm and contains 4 polar capsules. The polar filaments are thick and each measures 10·0–12·0 μm in length. The spores are characteristically arranged in groups of four for which the name ‘tetraspora’ is proposed.