Carcinulogical Fuiuia of India. '629 



Legs sufficiently long and stout, tlie penultimate pair being the. 

 longest ; their dactyli ai e sharply trigonal and elegantly plumose : the 

 last pair have the daetylus slightly curved and compressed. 



The abdomen of the male, which is fow- jointed, does nob nearly 

 fill the space between the last pair of legs. 



Between the 4th and 5th segments of the steiuutn, in the male, is 

 intercalated a long narrow plate that covers the external genital ducts. 



31. Camatopsis ruhida, Alcock and Anderson. 



Camatopsis ruhida, Alcock and Anderson, Ann. Mag. Nat. Hist. Jan. 1899, 

 p. 13 : Alcock, Investigator Deep Sea Brachynra, p. 76, pi. iv. fig. 3. 



Carapace very finely granular when denuded of the short velvet 

 that covei's it and all parts of the body and appendages. The narrow 

 front and the antero- lateral borders form a semicircular curve : the 

 postero-lateral borders are anteriorly convergent, the greatest breadth 

 of the carapace being between the bases of the penultimate pair of 

 legs. The tumid anterior (true inner) borders of the ejestalks bulge 

 beyond the orbital concavities of the anterior border of the carapace. 



The efferent branchial canals cause an angular bulging or carina- 

 tiou of the pterygostomian regions. 



The chelipeds are unequal in the male (female unknown), the 

 longer one being about If times tlie length of the carapace. They are 

 unarmed. In the larger hand the fingers meet only at tip and are 

 finely toothed in the distal half only, being rather deeply notched in 

 the basal half, while on the inner surface of the movable finger is a 

 curious tru.ncated spine. In the smaller hand the fingers meet through- 

 out their extent and only the immovable finger is distinctly toothed, 

 one or two of its teeth being enlarged. 



The first and last pair of legs are about If times, the second and 

 third pair are about twice, the length of the carapace. In the last 

 pair of legs the terminal joints are more strongly ciliated, and the 

 daetylus is slightly curved and compressed as for swimming. 



Coloui'S in spirit rich chocolate brown. Animal entirely covered 

 with velvet. 



Three males from the Andaman Sea, 194 fathoms. The carapace 

 of the largest is 9 millim. long and 10 millim. broad. 



Subfamily iv. Hexapodinj;, Miers. 



Lambdophallus, nov. gen. 



Near Htxapus, De Haan, from which it chiefiy differs in the form of 

 the anterior pair of mule sexual appendages, which are rigidly bent 



671 



