Volume 65, Issue 1
January 1967, pages 1-41
pp 1-9 January 1967
A comparative study of morphological and cytological characters of a diploid and artificially induced tetraploidsAsparagus officinalis has been made. Vegetatively tetraploids are more vigorous than the diploids but cytologically they exhibit an unstable nature. A breakdown of tetraploidy has been noticed which was due to large number of irregularities in meiosis like quadrivalents, trivalents and univalents at metaphase and laggards and bridges at anaphase. In few cases multipolar spindle and nuclear breakdown was seen. Several PMC’s showed reduced chromosome numbers probably due to chromosome elimination during the premeiotic division.
pp 10-15 January 1967
The paper reports the occurrence of eight species of microscopic interstitial polychaetes in the sandy beach of Waltair Coast. All the eight forms have not previously been recorded from India. Among the forms reported some are previously known only from the Atlantic and their occurrence in Indian Ocean throws considerable light on their geographical distribution.
pp 16-19 January 1967
Quantitative estimation of Glutamic, Oxaloacetic Transaminase (GOT) activity in the skeletal muscles of two freshwater fishes,Barbus tor, Day (Physostomi-Cyprinidae) andHeteropneustes fossilis, Bloch. (Physostomi-Siluridae) has been done, colourimetrically. It is observed that the GOT enzyme activity is closely associated with the red fibres and is directly proportional to the concentration of red fibres in the muscles.
InB. tor, the activity is more in the hypaxial area than in the epaxial and inH. fossilis, it is more in the epaxial area than in the hypaxial area. The activity is maximum in the lateral line area of the skeletal muscles of both fishes, wherein the concentration of red fibres is maximum.
pp 20-25 January 1967
Four new beds of clay and shale, observed to underlie the Padappakara limestone of Burdigalian age are recorded and described. The base is not seen. A pattern for their correlation in the four known localities in Quilon based on lithologic and stratigraphic similarities is outlined.
The exclusive occurrence of the detrital Warkala laterite overlying the limestone bed at Padappakara is explained as due to overlapping. The source of the lignite debris, noted for the first time in the Quilon beds, is postulated as an old unknown bed either underlying or having existed nearby, but later removed by erosion or diastrophism. The proximity of the source of the Quilon sediments is supported by the presence of graphite in the sediments.
pp 26-33 January 1967
1. Seasonal gonadal changes in adult mussels were observed.
2. The spawning starts in the month of March and continues up to October indicating a prolonged breeding period.
3. After the start of the spawning, lipid globules appear in the lumen of the follicles.
4. In the male, spermatocytical morulae appear after the start of the spawning.
5. No indeterminate sex condition or hermaphroditism is noticed.
pp 34-41 January 1967
The nervous system of the larva consists of a concentrated ganglionic mass lying in the IV and V body segments. This mass is distinguished into a supra-oesophageal portion, the cerebral ganglia, and sub-oesophageal portion, the ventral ganglionic mass. Only one pair of compound nerves originates from the cerebral ganglia. The ventral ganglionic mass is a product of the fusion of the sub-oesophageal ganglion, the three thoracic ganglia and the eight abdominal ganglia. Twelve pairs of nerves arise from the ventral ganglionic mass. Of these, the first pair is of a compound nature, the next three pairs are the thoracic nerves, and the remaining eight pairs are the abdominal nerves. In addition to these segmentally arranged lateral paired nerves, a series of seven unpaired median nerves arise, from the mid-dorsal region of the fused ventral ganglionic mass. Each median nerve soon divides into two secondary nerves on each side, which then accompany the lateral segmental nerves.
The stomodaeal nervous system consists of four unpaired ganglia, connected by an unpaired recurrent nerve. This system innervates the stomodaeum, the salivary glands, the aorta and certain muscles of the mouth parts.