122 STALK-EYED CRUSTACEA 



The fourth joint of the external maxillipedes is shghtly 

 truncated distally. The legs of the first pair in the adult 

 male are moderately robust and subequal ; fourth joint 

 short ; fifth and palm smooth or granulated above ; palm 

 sometimes carinated ; fingers usually carinated on the 

 superior margin. Walking legs short, compressed ; fourth 

 to the sixth joint dilated and carinated above ; last joint 

 slender, nearly straight, and longer than the preceding 

 joint. 



Abdomen of male five-jointed; thirdand fifth coal- 

 escent. 



Range. — Indo-Pacific region, West Indian Sea, 

 Bermuda. 



I. Lophactaea lobata. 



LopJiactcBLi lobata . . A. Milne Edwards, Miers. 



Cancer lobatns . . . H. Milne Edvv^ards, Guerin. 



Cancer vennsiiis . . . Desbonne and Schramm. 



Atergatis lobatns . . Stimpson. 



The carapace is wide, very curved from before back- 

 wards, strongly lobulated in front, very contracted behind. 

 The front Is sloped, lamellate, with a rounded outline, 

 slightly projecting, and divided in the middle line by an 

 indistinct fissure. The antero-lateral borders are pro- 

 longed very far behind, where they are continued in a 

 small ridge, where they form a right angle and are con- 

 tinued towards the cardiac region. They are divided 

 into four lobes by very narrow and short fissures. The 

 postero-lateral margins are short and concave. The first 

 pair of legs about the same size. The hand is short, com- 

 pressed, surmounted by a smooth crest ; the external face 

 has numerous granulations arranged irregularly towards 

 its superior border, but arranged below in three or four 



