IQI6. | S. Kemp: Notes on Crustacea Decapoda. 361 
development of this appendage there were marked sexual differ- 
ences. The condition in P. sculptus is, in fact, precisely the same 
as has been described above in the case of the related Indian form. 
As regards the characteristic tooth on the outer edge of the 
antennal scale, I noted, in the paper cited above, that it was 
apparently absent in a single Mediterranean example of P. sculp- 
tus preserved in the Indian Museum. Further examination of 
this individual shows that the tooth is indeed present, but situated 
at the proximal end of the scale. The specimen is, in fact, in all 
points identical with the types of P. incisus and differs from P. 
sculptus in the characters noted above. It is labeiled ‘‘ Mediter- 
ranean’’ without more precise locality and is said to have been 
received from FE. Cornalia, from whom Wood-Mason obtained a 
large number of Mediterranean Decapoda. From Heller’s descrip- 
tion,' however, it seems clear that the true P. sculptus occurs in 
the Mediterranean, for in his description of the antennal scale he 
says ‘‘am Seitenrande ausser dem endstandigen stachel mit einem 
zweiten beilaufig in der Mitte.’’ It is probable therefore that 
some mistake has arisen and that the specimen, said to have been 
found in the Mediterranean, was in reality obtained in Indian 
waters. 
In life Pontophilus incisus is closely mottled with dark grey 
and brown, the colouration being apparently protective. 
All the specimens in the collection are from the Andaman Is.— 
9027 Andamans, 20 fms. ‘ Investigator.’ I, 10 mm. 
2070-8 Port Blair, Andamans, S. Kemp. 41, 7-18 mm. 
2-12 fms. 
The specimens from Port Blair, among which the types of the 
species (9070/10) are included, were obtained in the channel off 
Ross I. on a rough bottom composed of sand, stones, shells and 
coral. 
Pontophilus lowisi, sp. nov. 
(Plate viii, fig. 2:) 
The rostrum is longitudinally channelled above; its lateral 
margins are curved and strongly divergent distally. The anterior 
margin is very broad and, in dorsal view, a little concave. The 
true apex is sharply deflexed; it has a rounded margin and is 
visible only from in front. 
On the carapace there is no trace of the transverse groove be- 
hind the rostrum which occurs in most species. In the mid-dorsal 
line there is a longitudinal carina which extends close up to the 
base of the rostrum. Throughout the greater part of its length 
this carina is obscure; but for a short distance just behind the 
middle of the carapace it is sharp and well defined and owing to 
its greater elevation is distinct in lateral view. A feeble groove 
runs obliquely forwards and downwards on either side of the cara- 

| Heller, Crust. siidlich. Europa, p. 228 £1863}. 
