228 Records of the Indian Museum. [ Voi,. XVI, 



The pelvic fins have a rounded tip and do not show the shape 

 characteristic of the adult. In the male specimens the claspers 

 have developed into small rod-like structures, arising at a point 

 about f the length of the fins from the base, and have slightly 

 pointed apices. The pelvic fins are at this stage proportionately 

 much smaller than in the adult ; they arise more ventrally and their 

 tips do not reach the base of the first dorsal ; the distance between 

 their tips and the base of the first dorsal being a little less than 

 that between it and the second dorsal. The rostral ridges are 

 broadly separated. The back is quite smooth but small tubercles 

 are just indicated along the mid-dorsal line, others are scattered 

 in two rows parallel to the middle and a few are also to be seen 

 round the orbits. 



The mouth is slightly arched. The teeth are very minute; 

 those along the inner and outer margins of both the jaws are 

 much larger than the others, which are to be seen all over the 

 jaws. The roof of the pharynx also has a large number of small 

 denticles. 



The co/owr of specimens in spirit is dark yellowish; the fins 

 are much lighter and appear of a creamy colour; the membrane 

 connecting the snout with the pectoral fins is light yellow ; the 

 ventral surface and the yolk-stalk creamy. The yolk-sac, how- 

 ever, is dark yellow. 



Measurements of a female specimen : — 



Length 



Maximum breadth of the disc 



Length of snout measured 

 from the mouth 



Distance between the nostrils 



Length of the yolk-stalk 



Yolk-sac 



Internal anatomy (fig. 4). — We do not propose dealing with 

 the internal anatomy at length ; a few of the outstanding features 

 of general interest alone are described . In the pharynx fairly 

 large semilunar openings of the spiracles are to be seen on either 

 side. The oesophagus is small, the stomach is long, having the 

 usual U-shaped form, with well developed longitudinal folds on 

 its inner walls and a thick valve at the pylorus. The duodenum 

 is very short and, like the oesophagus and stomach, quite empty. 

 The colon is very large and has a fully developed spiral valve; 

 the internal yolk-sac opens into it dorsally very near its anterior 

 end on the right side. The colon is full of yolk granules. The 

 rectum is a much thinner tube and has a large rectal gland. In 

 the cloacal region of the rectum the oviducts and ureters also 

 open (fig. 4). The liver and the gall-bladder are fuU}^ developed. 

 The former is brownish but the gall-bladder is of the usual greenish 

 tinge. The pimcreas and spleen are of a dark j-ellow colour. The 

 single ovary is as yet poorly developed. 



The internal yolk-sac is an ovoidal structure lying slightly 



