42 



Subgenus HEPOMADUS. 



Jfrpcmadui, Spenoe Bate, Ann. Mag. Xat. Hist., Sept. 1881, p. 189, and Challenger Crustacea Macrurn, p. 319. 



Rostrum imperfectly known, 3-toothed in one of the species and of fair 

 length in the female. Cervical groove distinct. Three spines on either side of 

 the carapace an orbital, a branchiostegal (post-antennal) and a hepatic. 



Terminal joint of the mandibular palp triangular. Bxopodite of the 2nd 

 maxillipeds slender, lax, much longer than the endopodite. Dactyli of the last 

 two pair of legs very slender. 



There is no podobranch to the third pair of thoracic legs, and no epipodite 

 or only a rudimentary one, to the fourth pair. The pleurobranchiae in advance 

 of somite XIV, though small and slender are plumose and therefore functional. 



The branchial formula is as follows : 



, ., Artlirobranchias. 



Podobranchiw. , - > Pleurobranchite. 



Appendages. Anterior. Posterior. 



Total 



4 + 6ep. 



6 + 1 small 1 + 6 small = 16 + 7 small + 6 ep. 



19. Aristceus (Hepomadus) tener ? S. I. Smith. 



Hepomadus tener, S. I. Smith, Albatross Crust., in Report U. S. Fiali. Comm. for 1882, p. 409, pl ir. figs. 7, 

 8, and for 1885, p. 85, pi. xix. figs. 3, 3a. 



From the Bay of Bengal, 1260 fathoms, a very much damaged specimen was 

 obtained which is probably this species. 



It is characterized by the large median spine that springs from the posterior 

 border of the 3rd abdominal tergum and projects far over the 4th tergum. 



The rudimentary epipodite of the penultimate pair of legs is a tiny filament. 



Colour in life, bright orange. 



BENTHESICYMDS, Spence Bate. 



Bcnthesicymut, Spence Bate, Ann. Slag. Nat. Hist., Sept. 1881, p, 190, and Challenger Crustacea Macrura, 

 p. 326 : 8. I. Smith, Bull. Mus. Comp. Zool. X. 1882-83, p. 81. 



Benthotcetet, S. I. Smith, Albatross Crustacea, in Report U. S. Fish. Commission for 1882, p. 391 



Integument thin, sometimes membranous or submembranous. 



