22 Memoirs of the Indian Museum. [Voi,. II, 



Since this was written three other specimens, including two males, have been taken 

 in 24 — 27 fathoms off the Ganjam coast (March 1909). The claspers of the male are 

 remarkably short. The following are the measurements of two males and two 

 females : — 



1 5 (type) ^ cf & 



Length of disk 



137-5 cm. 



170-0 cm. 



130-0 cm. 



135-4 cm. 



Breadth across disk . . 



195-0 „ 



222-5 ,, 



187-5 „ 



191-25 „ 



I^ength of tail 



132-5 „ 



147-8 „ 



102-5 ,, 



122-5 ,, 



Breadth of base of tail 



20'0 ,, 



17-5 „ 







Distance from base of tail to 











base of spine 



67-5 „ 



I2I-5 ,, 



II2-5 ,, 



130-75 ,, 



Breadth of nasal flap 





18-75 „ 



13-7 ,. 



12-5 „ 



Distance between eyes 



17-5 ,, 



23-75,, 



18-75,, 



20-0 ., 



lycngth of snout from eyes 



35-4 ,, 



40-0 ,, 



37-5 „ 



38-75,, 



Ivcngth from mouth to vent 







83-75,, 



87-5 „ 



From these measurements it is clear that the proportions are somewhat variable 

 in this species, the relative lengths of the tail and the disk especially being very different 

 in the different individuals. It is very unfortunate that the young one was not pre- 

 served. 



This is hot only the largest species of the genus I have seen, but it differs from 

 the other Indian forms in the shape of the tail and in the fact that all the denticles 

 have stellate bases. The photograph reproduced on plate iv, fig. i, is of the type, 

 and was taken as soon as the specimen was brought ashore. It shows the peculiari- 

 ties of the tail very clearly. 



The type specimen (skin and skull dried, mouth in spirit) is numbered F ^^i^ 

 in the registers of the Indian Museum. 



Tvygon uarnak (Forskal). (PI. i, figs. 1,2; pi. ii, figs, i, la ; pi, iii, fig. 2.) 



T. uarnak, Günther, op. cit., p. 473. 

 T. punctata, id., ibid., p. 474 (young). 



Size large (over 157 cm. across the disk in large individuals, not less than 23 cm. in 

 young). 



Colour in young white ; the dorsal surface covered with large round or oval black 

 spots ; the pectoral and pelvic fins edged with pink in life ; the tail boldly ringed 

 with black. As the fish grows, the white ground of the dorsal surface gradually 

 changes first to grey and then to pale brown, the spots become dark brown in col- 

 our and coalesce in various ways to form larger spots or complicated figures. A 

 similar change as regards colour takes place on the tail, but the dark rings 

 remain distinct. There is often a dark margin to the ventral surface of the disk. 



Disk with the lateral angles broadly rounded ; the length, considerably less than the 

 transverse diameter. In the young the broadest part of the disk is situated at a 

 point not much more than half the distance between the base of the tail and the 



