iQi6.] S. Kemp : 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 10. 



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 {I.e. supra) from 

 Sagami Bay in Japan, from the Gulf of Siam and from Chemulpo 

 in Korea, notes that the specimens recorded by Doflein in IQ02 as 

 L. inucronatus are in reality examples of L. planirostris, de Haan. 



^Y§~ Port Blair, Andainans, 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. 

 (Plate xxxvi, fig. 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 9 to 11 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- 

 natus ; the antennal scale (text-fig. 36) is closely similar in form. 

 The second peraeopods (text-fig. ^e) 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. 3/); in most cases, however, 

 as in L. mucronatus , single spines occur in this position. 



