1909.] K.. E. Lloyd: Deep-Sea Fish caught by the ‘'Investigator.” 143 
One small male specimen, measuring 36 cm. in its greatest length and 23 cm. in 
its greatest breadth, was taken from 130 fathoms in the Gulf of Aden. Station 360. 
Registered No. 
There are now six species of the genus Raia in the collection, each of which is 
represented by a single specimen Four of these are from depths of over 200 fathoms. 
Two are from more shallow water. Of these two R. powelli is from 67 fathoms in the 
Gulf of Martaban, the other, R. philipi, is from 130 fathoms in the Gulf of Aden. 
These two resemble one another more closely than any of the others. There is in the 
Indian Museum another specimen of the genus which was brought ashore by fisher- 
men at Travancore from water which must have been less than 10 fathoms in depth. 
This specimen closely resembles R. powelli ' but in some ways it also resembles 
R. philipi. It is possible that the three specimens are in a wide sense of one species 
which occurs rarely in the shallow waters around India and shows local variation. 
The specimens from Martaban and Travancore are both females, while the specimen 
from Aden is a male. It has been suggested to me that the differences exhibited may 
be of a sexual nature At present it does not seem advisable to describe the speci- 
men from Travancore as a new species, nor is it safe to infer without evidence that 
R. philipi is the male form of R. powelli. The measurements of the three specimens 
will be given in detail : — 
Name of specimen 
Locality . . 
Depth 
Sex 
Total length 
Breadth 
Snout to pelvic fin 
Vent to snout . . 
Width of mouth 
Corner of mouth to front end of nostril 
Length of snout from centre of upper jaw 
Greatest diameter of eye . . 
Spiracle 
Interorbital distance 
Position of greatest breadth — 
A, from snout 
B, from end of pelvic fin 
Number of teeth — 
Upper jaw . . 
Lower jaw 
Reg. No 
Raia powelli. 
Raia, sp. 
Raia philipi. 
G. of Martaban. 
Trivandrum. 
G. of Aden. 
67 fathoms. 
10 fathoms ( ?). 
130 fathoms. 
Female. 
Female. 
Male. 
318 mm. 
475 mm. 
350 mm. 
191 
315 .. 
220 ,, . 
187 .. 
290 ,, 
220 ,, 
150 ,, 
235 .. 
174 .. 
— ^ , 
46 „ 
32 ,, 
17 >. 
25 .. 
16 „ 
54 .> 
78 ,. 
60 ,, 
9 
12 ,, 
II ., 
9 
17 ., 
II ,. 
13 .. 
22 ,, 
16 ,, 
93 ... 
147 .. • 
135 .. 
94 .. 
•143 .. 
85 .. 
55 >> 
75 .. 
80 ,, 
55 .. 
75 .. 
bo ,, 
235 
2708 
1383 
I 
I 
I 
As regards the form of the disk R. powelli and the Travancore specimen resemble 
one another exactly, and differ widely from R. philipi, in which the greatest breadth 
is much further ^ack. As regards the shape of the mouth the Travancore specimen 
is intermediate between the other two (text-fig. i), while as regards the relative 
' See Annandale, Mem. hid. Mus., vol. ii, No. i, p. 16. 
