Volume 59, Issue 4
April 1964, pages 185-243
pp 185-194 April 1964
The spores ofA. aureum are trilete and granulose. On germination, a 6–10 cells long germ filament is produced, in which growth is mainly by intercalary formation of new cells rather than by cell elongation. One or two of the terminal cells become quiescent soon, and the intercalary cells form a prothallial plate. Cells on one side of the plate are more active than those on the other, and a broad ameristic lateral lobe is developed by their activity. As the lobe becomes spatulate, a multicellular meristem is differentiated from marginal cells on the side facing the posterior end of the germ filament. By the activity of the meristem the prothallus becomes cordate, with the meristem at the bottom of the notch. A midrib is formed behind the notch and the prothallus grows to become asymmetrically cordate. The mature prothallus is naked and with ruffled wings. Juvenile leaves possess entire, naked lamina.
pp 195-210 April 1964
pp 211-221 April 1964
The anatomy and histology of the alimentary canal has been described. The mouth is inferior and the fish is mostly a bottom feeder. Jaw-teeth and pharyngeal teeth patches are well developed. Taste-buds are present in the lips, buccal cavity, pharynx and anterior oescphagus. The pharynx is divisible into three regions. A transitional region termed the ‘oesogaster’ is present. The stomach is U-shaped and the gastric glands are present only in the ‘corpus’ part. There is no differentiation of glandular cells into oxyntic and peptic cells. The pyloric stomach has thicker musculature. A pyloric valve is present. The intestine is short; the mucosa has only two kinds of cells, columnar and goblet cells. The rectum has thicker musculature and a large number of goblet cells.
pp 222-227 April 1964
The calc-granulites from Srikakulam District with particular reference to their field and mineral characters are described. Calcite, diopside, and quartz belong to the granulite facies while sphene, scapolite and apatite have been formed by the transformation of calcite during regional metamorphism.
pp 228-236 April 1964
Peculiar, variously shaped osteo and brachysclereids occur in small numbers, in the stem, male cones and seed integument ofCephalotaxus drupacea Sieb.et Zuc. C. The distribution of these sclereids is rather localised in the stem and diffuse in the cones. A very curious feature of these sclereids is the presence of small, pointed or blunt emergences of the original cell protoplast, on the secondary wall. These are supposed to be the unlignified portions of the original protoplast, which have been cornered during the process of lignification. Both the types of sclereids develop from a parenchymatous initial. The ultimate form depends on the nature of the surrounding tissue and the organ in which they develop.
pp 237-243 April 1964