336 A. Alfock — Carcinological Fauna of India. [No. 3 



angle of the merus, propodite large and articulating with the end of 

 the carpus, dactylus large and spathulate and articulating with the 

 inner angle of the propodite : exognath small and a good deal con- 

 cealed. 



Chelipeds equal, short : the chelipeds in the male equal, and much 

 stouter than the legs. 



First 3 pairs of legs coarse, not differing much from each other or 

 from the chelipeds in length, though the second pair are slightly the 

 longest. The fourth (last) pair are very much smaller than the others. 



The abdomen of the male is narrow and consists of 7 separate 

 segments. 



Tetrias differs very little from Pinnixa of which it might, perhaps, 

 be regarded as a subgenus. 



Distribution : Indo-Pacific, Andamans to California. 



36. Tetrias Fischeri, (A. M. E.). 

 or Pinnixa (Tetrias) Fischeri (A, M. E.). 



Pinnotheres Fischeri, A. Milne Edwards, Ann. Soc. Entomol. France, VII. 1867, 

 p. 287. 



Pinnixa Fischeri, A. Milne Edwards, Nouv. Archiv. da Mas. IX. 1873, p. 319, 

 pi. xviii. fig. 3 : de Man, Archiv fur Naturges. LI II. 1887, i. p. 385, pi. xvii. fig. 2. , 



Carapace and appendages everywhere covered by a close adherent 

 coat of short hair. The regions of the carapace are fairly well indicated 

 and its dorsal surface is closely and finely granular, except in the 

 middle where also the hair is somewhat deficient. Deflexed edge of the 

 front broadly triangular. Eyes well pigmented. The inner edge of the 

 carpus and the inner and distal edges of the large spathulate dactylus 

 of the external maxillipeds are fringed with a close row of hairs of 

 extraordinary length. 



Chelipeds in the male much more massive than the legs, and about 

 If times the length of the carapace: their movements are somewhat 

 restricted. There are some spinules at the inner angle of the wrist, and 

 numerous rows of granules — the lowermost row rather acute — on the 

 outer surface of the palm : the fingers, which are shorter than the palm, 

 are stumpy but sharp-pointed. 



The first 3 pairs of legs are coarse and are all about H times the 

 length of the carapace, though the second pair are very slightly the 

 longest. The 4th pair are very short — not two thirds the length of the 

 carapace — and are much slenderer than the others. All the legs have a 

 shaggy posterior border, and all end in small hooked dactyli. The 

 posterior border of the meropodite of the last pair is armed with small 

 coarse spines. 



