Volume 7, Issue 2
February 1938, pages 49-108
pp 49-53 February 1938
pp 54-60 February 1938
pp 61-79 February 1938
The most striking histological features of the digestive tract ofSaccobranchus fossilis are the following:-
Taste buds roughly resembling those of the mammals in structure are present in the lips, buccal epithelium and pharynx in great numbers and a few are present in the œsophageal region.
In the buccal epithelium and in the anterior part of the pharynx there are giant cells, conspicuous by their one or more nuclei. These cells are dividing cells and no mention is made of them by any of the previous authors.
The anterior region of the pharynx is separated from the posterior part, for reasons mentioned in the paper.
No part of the free surface of the posterior region of the œsophagus, is free from mucous cells. External longitudinal muscle bundles are absent in the œsophagus.
The pneumatic duct comes and joins the posterior part of the œsophagus, while the bile and the pancreatic ducts open into the anterior part of the intestine just near the pyloric end of the stomach.
The stomach is divisible into cardiac and pyloric regions. The former is conspicuous by the presence of the glands while the latter is devoid of them.
There is no pyloric valve, nevertheless, the same object is achieved by the presence of the pyloric sphincter. There is no intestinorectal valve.
pp 80-102 February 1938
It is suggested that the chromophobic or idiosomic component of vertebrate somatic cells occurs as a core in the Golgi substance. In the liver cells ofRhacophorus during activity, the core which is masked in the early stages becomes differentiated inside the substance of the apparatus in various regions. Rupture and disintegration of the apparatus takes place in those regions where chromophobic areas have been differentiated resulting in the formation of osmophil masses which have no visible chromophobic component. The demonstration of a chromophobic or idiosomic component in the vertebrate Golgi apparatus renders the comparision of secretion of various substances by the apparatus in vertebrates and invertebrates more logical.
pp 104-108 February 1938