240 CRUSTACEA. 



coat. Carapax somewhat convex, not areolate, nearly quadrate, a 

 little transverse; front emarginate ; antero-lateral margin very short, 

 three-toothed, the teeth minute spines, posterior one much the 

 smallest. Anterior feet not tuberculate ; eight posterior feet quite 

 slender, tarsus mostly covered with a very minute pubescence, like 

 that of the legs and carapax. 



Plate 13, fig. 13 a, outline of antero-lateral margin; b, leg of poste- 

 rior pair, enlarged three diameters. 



Sooloo Sea, or Straits of Balabac. 



Length of carapax, 24 lines ; greatest breadth, 3 lines ; ratio of 

 length to breadth, 1 : 1'25. The pubescence or tomentose covering is 

 exceedingly short, and covers uniformly the carapax and legs; on the 

 posterior legs, which are quite slender, its length is not equal to one- 

 fourth the diameter of the fifth joint. The sternum, abdomen, ptery- 

 gostomian region, and outer maxillipeds, are covered with the same 

 kind of pubescence. The fingers are light-coloured. 



PILUMNUS MUS. 



P. ursulo affinis, carapace pedibusque densd crassegue* lanatis, capillis 

 tubulatis. Carapax parce granulatus. Frons fimbrid longd ornatus. 

 Margo antero-lateralis crassd tridentato, dente altero brevi inter duos 

 anteriores infra insifo. Pedes antici incequi, manu minute* tuberculatd, 

 tuberculis superficiei externce seriatis. 



Near P. ursulus, carapax and feet being densely covered throughout 

 with long, coarse hairs, which are tubular. Surface of carapax 

 slightly granulate. Front with a long fringe of similar hairs. An- 

 tero-lateral margin stout three-dentate, another short tooth, situated 

 on a lower line, between the two anterior teeth. Anterior feet un- 

 equal, hand minutely tuberculate, tubercles of the outer surface 

 seriate. 



Tongatabu and Samoan Islands. 



Length of the carapax of a male, eleven and one-half lines ; greatest 



