8 



THE VOYAGE OF H.M.S. CHALLNGEE. 



anterior pairs of legs in female and all but tlie 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 biarticulate, inner uniarticulate. 

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



Genera. 



1. Pseudoetima, G. O. Sars. 



2. Petalomera, G. 0. Sars. 



7. CUMELLID^. 



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. Antennulse 

 quite similar in both sexes, flagella very unequal, the smaller one uni- or biarticulate. 

 Antennae in male with outer part of jieduncle distinctly biarticulate, flagellum composed 

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

 slender and slightly dilated at the extremity, lateral spines few in number. Epi^jodite 

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

 exopodite 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-developed 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 biarticulate, inner uniarticulate. Telson 

 wanting. 



Genera. 



1. Cumella, G. 0. Sars. 



2. Nannastaeiis, Sp. Bate. 



3. Spencobatea, Norman. 



8. CAMPYLASPIDiE. 



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 flagella obsolete. AntennjB 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 maxillas unusually large, 

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

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



