702 THE VOYAGE OF H.M.S. CHALLENGEE. 



The anterior two pairs of pereiopoda resemble each other in form and nearly 

 correspond in size, they differ from those of Atya sulcatipes in having the carpos more 

 cup-shaped, for the reception of the posterior or carpal extremity of the propodos (&). 

 The posterior three pairs are subequal in size and form, they are slender and have 

 the margins subparallel and fringed with small spines, particularly on the posterior margin 

 of the three distal joints. 



Habitat. — Honolulu. One hundred specimens, of which eleven were gravid with 

 numerous long-ovate ova; the largest specimen was 35 mm. and the smallest 23 mm., 

 which was also the size of the males, which differ in little else from the females. 



Sandwich Islands, Randall, Dana, HUgendorf, and Stimpson ; Seychelles, Hoffman. 



Caridina, Milne-Ed wards. 



Caridina, Milne-Edwards, Hist. Nat. Crust., torn. ii. p. 362. 



The carapace, according to Milne-Edwards, presents no special feature ; it is 

 anteriorly produced to a flattened tenuous rostrum ("rostre lamelleux "), of which the 

 length varies in different species. 



The ophthalmopoda are prominent. 



The first pair of antenna; is very long and terminates in two flagella, one of which is 

 stout at the base. 



The second pair of antennse resembles that of Palsemon. 



The second pair of gnathopoda is long, slender, and pediform. 



The anterior two pairs of pereiopoda are didactyle. The first pair is very short, and 

 possesses a very remarkable character, the carpos being triangular, and anteriorly pro- 

 duced in a concave border, and receives the posterior margin of the propodos, which is 

 attached to its inferior angle ; the propodos is short, the fingers being deeply hollowed 



