22 
Memoirs of the Indian Museum. 
[VOL. 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 : — 
9 (type) 
9 
& 
cf 
Length of disk 
137-5 
cm. 
170-0 cm. 
i30‘0 cm. 
135-4 cm 
Breadth across disk . . 
195-0 
y y 
222-5 ,, 
187-5 ,, 
191-25 „ 
Length of tail 
132-5 
y y 
147-8 ,, 
102-5 ,, 
122-5 ,, 
Breadth of base of tail 
20-0 
y > 
17-5 „ 
, , 
Distance from base of tail to 
base of spine 
67-5 
) ) 
121-5 ,, 
112-5 ,, 
130-75 ,, 
Breadth of nasal flap 
. . 
18-75,, 
13-7 ,, 
12-5 „ 
Distance between eyes 
17-5 
y y 
23-75 „ 
18-75 „ 
20-0 ,, 
Length of snout from eyes 
35-4 
y y 
40-0 ,, 
37-5 ,, 
38-75,, 
Length 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 not 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 ver}^ clearly. 
The type specimen (skin and skuU dried, mouth in spirit) is numbered F 
in the registers of the Indian Museum. 
Trygon uarnak (Forskâl). (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 
