I9I9.] 



S. Kemp : Notes on Crustacea Decapoda. 



341 



across the inner face, while the outermost runs along the lower part 

 of the outer surface and extends to the proximal end of the 

 palm. Between these ridges 

 there are a few extremely 

 minute tubercles; the re- 

 maining portions of the 

 palm, including almost the 

 whole of the outer surface, 

 are quite smooth. The 

 fingers meet only in their 

 distal third when the claw 

 is closed ; their tips are 

 curved a little inwards and 



are slightly spatulate. The fixed finger is without teeth; the 

 dactylus is ridged above and bears a low crest of minute teeth 

 in the proximal half of its prehensile edge. 



Text-fig. 14. 



Tympaiiomeriis sieve nsi, 

 sp, nov. 



Chela of male. 



Text-fig. 15. — Tympanomei'us steveiisi, sp. nov. 

 Abdomen of male (left), of female (right). 



In females the chelipeds are a little more slender and the 

 fingers are fully twice the length of the upper border of the palm. 

 The palm is crested above with the row of setae on the inner face 

 as in the male ; but on the lower side there are only two carinae, 

 enclosing a flattened lower surface, and each of these carinae bears 

 long setae. The fingers are more distinctly spatulate than in the 

 male ; they gape widely at the base and there is no denticulate 

 crest on the dactylus. 



The third or penultimate pair of walking legs is the longest, 

 nearly two and a half times the length of the carapace. There 

 are well defined tympana on the upper and lower surfaces of the 

 meri of the first two pairs and on the lower surface of the last 

 two. In the proximal half of the merus of the two intermediate 

 pairs, on the dorsal surface, there is a finely crenulate ridge run- 

 ning parallel to the upper border. The edges of the meri are 

 finely spinulose, a feature specially well marked on the posterior 

 borders of the second and third pairs. In these two pairs the carpus 



