1916. |] 5S. Kempe: Notes on Crustacea Decapoda. 397 
there are 2 teeth and in two specimens 3 teeth in this position. 
In no case is there a tooth in the posterior third of the carapace 
as in de Haan’s figure of L. planirostris. The teeth on the upper 
edge of the rostrum in the male may be as many as Io. 
Living specimens were as a rule inconspicuously mottled ; two 
examples were, however, found in which the carapace and the 
greater part of the abdomen were of a uniform rich red-brown, the 
tail-fan and the posterior half of the last abdominal somite being 
pure white. 
Balss, who has recently recorded this species (J.c. supra) from 
Sagami Bay in Japan, from the Gulf of Siam and from Chemulpo 
in Korea, notes that the specimens recorded by Doflein in 1902 as 
L. mucronatus are in reality examples of L. planirostris, de Haan. 
2265 Port Blair, Andamans, 2-6 fms. S. Kemp. Thirty. 
Most of the specimens were obtained among weeds in the 
channel off Ross I.; a few were found in Brigade Creek. 
Latreutes porcinus, sp. nov. 
(Rlaterxsxcxvi es .3))) 
In general form there is very little difference between the 
sexes; in both the carapace is sharply carinate dorsally, the carina 
being very high and abruptly declivous in its anterior third. The 
carina is armed with rather irregular procurved teeth, 6 to 12 in 
number (usually g to Ir in large specimens). The series begins 
behind the middle point of the carapace and the foremost 3 or 4 
are usually in advance of the orbit, though separated, in the ma- 
jority of the specimens, by an unarmed interval from the teeth on 
the rostrum proper. The antennal spine is present and there are 
7 or 8 spinules on the antero-lateral margin. 
The rostrum resembles that found in female L. mucronatus, 
being semiorbicular and rounded anteriorly or broadly lanceolate 
and more or less pointed at the apex. The teeth are on the whole 
less numerous than in the allied species; the dorsal series consists 
of from 4 to 8 and the ventral of from 3 to 8; in most specimens 
there are from 5 to 7 on each margin. In two out of the fifteen 
specimens examined there are three minute teeth in the interval 
between the upper rostral teeth and the series on the carapace. 
The antennule (text-fig. 3a) is more slender than in L. mucro- 
naius ; the antennal scale (text-fig. 3b) is closely similar in form. 
The second peraeopods (text-fig. 3¢) are a trifle more slender and 
of the three segments of which the carpus is composed the second 
is proportionately longer, exceeding the length of the first and 
third combined. The last three peraeopods are similar to those of 
L. mucronatus, but the terminal spine of the dactylus is usually 
more slender than the next of the series. In a few individuals 
two spines are to be found at the distal end of the lower margin of 
the merus of the third pair (text-fig. 3f); in most cases, however, 
as in L. mucronatus, single spines occur in this position. 
