IQ16. | S. Kempe: Notes on Crustacea Decapoda. 305 
rostrum is, however, more definitely concave in dorsal view and the 
anterior tooth of the second lateral carina of the carapace is less 
acute. The outer margin of the merus of the first legs terminates 
in a small spine and two similar spines exist between it and the 
articulation of the carpus: these spines do not exist in the type. 
The dactylus of the second legs is proportionately shorter than in 
the female, less than twice the length of the palm. The dorsal 
carina of the fourth abdominal somite is feebly channelled longitu- 
dinally; that of the fifth is similar in its anterior half, but poste- 
riorly it is split into two divergent branches. On either side of the 
median line in the third, fourth and fifth somites are short but 
well defined carinae, which are transverse on the third but take a 
more oblique direction on the two succeeding somites. Inthe type 
specimen these lateral carinae are obsolete and the median keel of 
the fourth somite does not appear to be bifurcated posteriorly. In 
the pleopods there is a wide difference between the sexes. The 
endopod of the last four pairs is well developed in the female; but 
in the male is exceedingly small in the second, third and fourth 
pairs and is entirely absent from the fifth. 
In life the male was almost pure white in colour with a black 
spot in front of the median tooth of the carapace, a pair of similar 
spots on either side between the first and second lateral carinae 
and a pair near the posterior margin. There were transverse 
bars of black pigment on the fourth abdominal somite and on the 
tail-fan, a black band near the distal end of the subchela and 
three similar bands on the fourth leg, situated on the ischium 
merus and propodus. 
£985 Port Blair, Andamans, 6 fms. S. Kemp. 1 ¢,8mm. 
e 
Pontophilus candidus, sp. nov. 
(Plate viii, fig. 3.) 
The rostrum is flat and not channelled longitudinally ; its lat- 
eral margins are curved, convergent from the base to the middle 
and divergent from the middle onwards. The distal end, seen in 
dorsal view, is abruptly and squarely truncate. The true apex of 
the rostrum is sharply deflexed ; it is visible only from in front 
and has a broadly convex margin. 
The carapace is entirely devoid of carinae ; its surface, though 
smooth to the naked eye, is microscopically scabrous. The trans- 
verse depression usually found behind the rostrum is obsolete. 
The spinulation shows a remarkable difference in the two sexes. 
In the male there is a sharp spine in the median line a little behind 
the base of the rostrum, but of this in the female there is no trace. _ 
In both sexes there is a sharp hepatic spine, situated about on the 
same level as the dorsal spine of the male, and below and in 
advance of if is another conspicuous spine situated behind the 
branchiostegal angle. In the male there is a short longitudinal 
groove above the hepatic spine and another beneath it, shallower 
