DORYCEPHALUS AMBOBUS. 79 



2. Dorycephalus ambobus, TH. STEBBING, 1888. 



Diagn. The head is about as long as the whole perseon and the first 

 two pleonal segments together. 



The first pair of perceopoda are subcheliform ; the under free 

 margin of the carpus is longer than the hind margin of the 

 metacarpus ; the lower part of the hind margin of the carpus 

 is provided with a dozen sharp, simple teeth. The second 

 pair are cheliform, with the carpus strongly produced; the 

 carpal process is strongly serrated on the front margin, and 

 provided with six or eight sharp teeth on the hind margin 

 just above the apex; the front margin of the carpal process 

 is longer than the hind margin of the metacarpus. The 

 femur of the seventh pair is not half as long as that of the 

 sixth, as long as broad, and half as long again as all the 

 following joints together. 



The lateral parts of the first two pleonal segments are angular 

 behind; the hind corner of the third segment is produced 

 into a sharp-pointed process. 



The inner ramus of the second pair of uropoda is a fourth part 

 longer than the outer; the inner ramus of the third pair is 

 three times as long as the peduncle, and twice as long as 

 the outer ramus. 



Syn. 1888. Leptocotis ambobus. TH. STEBBING. 39, p. 1594, pi. 205. 



For a full account of Dorycephalus ambobus I refer the reader 

 to the description and drawings given by STEBBING. 



COLOUR. Almost hyaline, the ocular pigment dark brown. 

 LENGTH. 11 14 mm; (eleven-twentieths of an inch, STEBBING). 

 HAJB. The tropical region of the Pacific; New Caledonia; South 



Pacific, Lat. 36 32' S; Long. 132 52' W. (STEBBING). 



