The Family Oxycephalid^. 



47 



cccc 1. The second pair of 

 antenoœ in tlie male 

 are hidden under the 

 head and the periBon, 

 when folded, the first 

 joint not being half 

 as long as the second. 

 CCCC 2. The second pair of 

 antennse in the male 

 are hidden only under 

 the head, when fold- 

 ed, the first joint be- 

 ing about as long as 

 the second. 



ccc 2. The first two pairs of peraeo- 

 poda with a cheliform hand, 

 the carpal process being 

 spoon-shaped. The head is 

 produced into an obtuse, 

 rounded rostrum. 



c 2. The last ural segment is more than twice as 

 long as the first. 



7. Craaocephalus. 



8. Stebbingella. 



9. Grlossocephalus. 



10. Leptocotis. 



Gen. 1. Simorhjncliotus, Th. Stebbing, 1888. 



Diagn. The head is short, not produced, or only a little produced, 

 forming a thick, broad, obtuse snout. The hind part of 

 the head is not constricted. 



The second pair of aniennœ in the male are concealed under 

 the head and the perason, when folded. 



The first pair of perœopoda have a folding hand, the second 

 pair a subcheliform. The carpus and metacarpus of the fifth 

 pair are not dilated. 



The last ural segment is about as long as the first, and is 

 broader than long. 



The inner rami of the last two pairs of urojpoda are co- 

 alesced with the corresponding peduncles. 



The telson is very broad, and triangular. 



