8 THE VOYAGE OF H.M.S. CHALLNGER. 



anterior pairs of legs in female and all but the last in male with well-developed 

 natatory exopodites. Only a single pair of pleopoda present in male. Uropoda, com- 

 paratively short, with the branches lanceolate, outer Inarticulate, inner uniarticulate. 

 Telson distinctly defined, but extremely small, rounded at the tip and unarmed. 



Genera. 



1. Pseudocuma, G. 0. Sars. 2. Petalomera, G. 0. Sars. 



7. CtTMELLIDJE. 



Integuments more or less indurated. Tail very slender and rather sharply defined 

 from the trunk. Eye single or double, in male much larger than in female. Antennula? 

 quite similar in both sexes, fiagella very unequal, the smaller one uni- or Inarticulate. 

 Antennae in male with outer part of peduncle distinctly Inarticulate, flagellum composed 

 of rather elongate and slender articulations. Mandibles with the anterior branch 

 slender and slightly dilated at the extremity, lateral spines few in number. Epipodite 

 of maxillipeds with the gill-lobules in female very slightly developed, terminal plate of 

 cxopodite exserted into a narrow tubular flap. Second pair of gnathopoda with the 

 terminal part irregularly flexuous. The two anterior pairs of legs in female, and all but 

 the last in male, with well-develojaed natatory exopodites. The three posterior pairs of 

 legs extremely slender and terminating in a distinct claw. Pleopoda quite wanting 

 in both sexes. Uropoda with outer branch Particulate, inner uniarticulate. Telson 

 wanting. 



Genera. 



1. Cumella, G.'O. Sars. 



2. Nannastacus, Sp. Bate. 



3. Spencebatea, Norman. 



8. Camp yl a spice. 



Integuments strongly indurated and calcareous. Carapace enormously developed 

 and highly vaulted in its hinder part. Tail comparatively short, with the segments 

 somewhat depressed. Eye generally present. Antennulse similar in both sexes, with one 

 of the fiagella obsolete. Antenna? in male with the flagellum filiform and composed of 

 elongate and slender articulations. Mandibles slender, with apex obliquely truncate and 

 dentate, molar process very narrow, styliform. First pair of maxilla? unusually large, 

 with the masticatory lobes strongly spinous ; second pair poorly developed, forming 

 simple, small, membranous plates. Maxillipeds imperfectly developed, terminal part 



