1900.] A. Alcock — Garcinological Fauna of India. 329 



Legs sufficiently long and stout, the penultimate pair being the 

 longest ; their dactyli are sharply trigonal and elegantly plumose : the 

 last pair liave the dactylus slightly curved and compressed. 



The abdomen of the male, which is four-jointed, does not nearly 

 fill the space between the last pair of legs. 



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

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



31. Camatopsis rubida, Alcock and Anderson. 



Camatopsis rubida, 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 covers it and all parts of the body and appendages. The narrow 

 front and the anterolateral 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 eyestalks bulge 

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



The efferent branchial canals cause an angular bulging or carina- 

 tion of the pterygostomian regions. 



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

 longer one being about If times the 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 truncated 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 

 dactylus is slightly curved and compressed as for swimming. 



Colours 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. Hexapopin^:, Miers. 



Lambdophallus, nov. gen. 



Near Hexapus, De Haan, from which it chiefly differs in the form of 

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



