356 Records of the Indian Museum. [Vors Xin; 
and four from Port Blairinthe Andamans. One of the new forms, 
P. inctsus, is a very close ally of the Atlantic and Mediterranean 
P. sculptus, the remainder are sharply distinguished from all species 
previously described by well-marked characters found in the sculp- 
ture of the carapace and abdomen and in the form of the rostrum, 
lateral process of the antennule, antennal scale and first two pairs 
of legs. 
In some of the species there are considerable differences be- 
tween the sexes in the form of the last four pairs of pleonods, a 
feature discussed in detail on p. 381, and other sexual distinctions of 
an unusual nature are met with in P. Jowist and P. candidus. Inthe 
former the antennal scale, which is remarkable for the possession 
in both male and female of a series of spinules on its outer margin, 
shows wide differences in form in the two sexes. In the latter a 
conspicuous spine in the mid-dorsal line of the carapace is present 
in the male and absent in the female, a remarkable distinction when 
the great constancy of the armature of the carapace in other spe- 
cies is remembered. 
The ten Indian species of Pontophilus may be distinguished 
thus :— 
I.—First peraeopods with rudimentary exopod ; second pe- 
raeopods very short, not reaching distal end of merus 
of first pair, their chela well formed with curved 
fingers ; lateral process of antennular peduncle styli- 
form, much longer than broad. 
A. Median carina of carapace with two spines... gvacilis, Smith. 
B. Median carina of carapace with three spines... abyssz, Smith. 
[1.—First peraeopods without exopod ; second peraeopods 
longer, reaching beyond carpus of first pair, their chela 
ill-formed with parallel fingers; lateral process of an- 
tennular peduncle not styliform, usually subquadrate 
and broader than long. 
A. A median longitudinal carina on carapace and 
on 3rd, 4th and 5th abdominal somites [ ros- 
trum bread distally, anterior margin squarely 
truncate or concave ]. 
1. Outer margin of antennal scale armed with a 
spine or a series of spinules in addition to 
a terminal spine. 
a. Carapace with five carinae bearing spines; a 
single additional spine on outer margin of 
antennal scale, placed near base; merus of 
first peraeopods with a single spine at distal 
end of outer margin; first four abdominal 
somites with strong lateral sculpture os ANCISUS, SPO. 
6. Carapace without spines and without lateral 
carinae ; a series of spinules on outer margin 
of antennal scale; merus of first peraeopods 
with three spines at distal end of outer mar- 
gin ; lateral sculpture of first four abdomi- 
nal somites feeble ve ... lowtst, sp. nov. 
2. Antennal scale without additional spines on 
outer margin; [carapace with spines and 
lateral carinae ; first four abdominal somites 
with strong lateral sculpture.] ... ... Sabsechota, Kemp. 
B. No median longitudinal carinae on carapace or 
abdomen. 
