RATHBUN : CRABS FROM THE MALDIVE ISLANDS. 127 



of the buccal cavern. The two ridges on the ischium of the outer maxillipeds 

 are further apart than in P. jukesii. 



The chelipeds of the immature male are equal and very slender, scarcely 

 stouter than the last pair of legs, and about as long as the carapace. The palm 

 is a little shorter than the ischium and nearly twice as long as the fingers, 

 which are bent down, deeply grooved, and meet throughout their length. 



In the first three pairs of legs the merus is stout and broad, with a granular 

 dorsal surface and coarselj' and unevenly serrulate edges, the anterior edge 

 ending in a crest-like tooth. The carpus is dorsally bicarinate and its anterior 

 border has the form of a two-lobed carina. The propodus and dactylus are 

 edged with thin sharp carinae, that on the anterior margin of the carina of the 

 second and third pairs being plumed. The fourth pair are cylindrical and 

 finely granular, the dactylus considerably shorter than the propodus, the latter 

 having a posterior marginal border of setae. 



The first pair of ambulatory legs are a little longer, the fourth pair a little 

 shorter, than the carapace, the second and third pairs about one and a half 

 times as long as the carapace. 



In the male all the abdominal terga except the last are transversely carinate, 

 the carinse of the second and third terga being most conspicuous. Also on 

 either side of the sternum there are two crests, one behind the base of the last 

 pair of legs, the other almost in a line with the third abdominal carina. 



Dimensions. — Male, length of carapace, 6.4 mm.; width between outer 

 orbital angles, 6.9 mm. ; width between tips of next lateral teeth, 7.7 mm. ; 

 width between bases of second and third legs, 6 mm. 



Color. — In alcohol there are traces of dark speckles ; there is a larger circu- 

 lar spot on each protogastric region and each cardiac lobule. 



Type locality. — Nallandu, at anchorage, 24 fathoms, January 18 ; two males, 

 immature. 



This species can be separated at sight from all others by the carapace being 

 wider in front than behind. 



PILUMNID^. 



Carpilodes pediger Alcock. 



Carpilodes pediger Alcock, Journ. Asiatic Soc. Bengal, LXVII. 83, 1898. Illus. 

 Zool. Inveetigator, Crust., part YU. pi. XXXVI. fig. 4, 1899. 



Male, at anchorage, January 11 ; one male. 



Nallandu, at anchorage, 24 fathoms, January 18 ; two females, one with ova. 



The specimens are all small, the female with ova measuring 3.7 mm. long 

 and 5.8 mm. wide ; its carapace is a light yellowish red in alcohol, with lateral 

 teeth gray and mottlings of gray on the posterior half. 



