Boone, Crustacea, Cruise of ''Alva," 1931 153 



hiti, Society Islands, and was deposited in the Smithsonian Institute 

 and the Philadelphia Academy of Natural Sciences. 



Distribution : As cited above, Paumotus and Tahiti, (Dana) ; Ta- 

 hiti, (Rathbun) ; Mergui Archipelago, (de Man) ; Tahiti, (Boone) ; 

 Japanese Seas, (Miers). 



Material examined: One specimen, taken on Venus Point Reef, 

 Tahiti, Society Islands, August 15, 1931. 



Technical description : Carapace oval, frontal margin very wide, 

 sinuate, the submedian lobes very wide, slightly convex, the outer pair 

 minute, acute, scarcely as large as the notch separating it from the de- 

 flected, nearly right-angled preorbital angle; there are two closed 

 sinuses on the orbital margin, one of which is very obscure; the 

 postorbital angle is an acute spine; the anterolateral margin is short, 

 convex, cut into three sharp, procurved, uptilted spines, in addition to 

 the postorbital spine; the first of these spines is widest basally, the 

 second is narrower but equally high, while the third spine is definitely 

 the smallest of the series ; behind the last lateral tooth the postlateral 

 margins are moderately but definitely convergent. The postlateral 

 margin is wide, weakly carinate in the median area. The dorsal sur- 

 face is moderately tumid with the cardiac region circumscribed and 

 continuous with it is a tonguelike process extending forward between 

 the gastric lobes. The cervical groove is deep and confluent with a 

 sulcus that nearly circumscribes the orbit. A slight median sulcus 

 runs back from the median notch. There are a pair of small, anteriorly 

 truncated lobes behind the frontal border and separated posteriorly 

 from the larger gastric lobes, which are moderately tumid. Inside the 

 anterolateral margin on the outer branchial and hepatic regions there 

 is a line of five acute spines, the anterior one of which is on the orbital 

 margin, and the posterior one the opposite the last lateral spine. There 

 are also a few granules behind the orbit on the branchial area. 



The pterygostomian region is granular. The chelipeds are about 

 equal in the male, the short trigonal merus thick, coarsely spinulose 

 on both upper lateral margins ; the small exposed upper surface and 

 distal margin also spinose ; the carpus is entirely covered on its upper 

 and outer surface with sharp procurved spines, two of which, one 

 below the other, are on the inner angle ; the palm and fingers are two 

 and one-third times as long as the carpus, the palm being a trifle 

 over half of this length ; the palm is moderately dilated, with the entire 

 upper and outer surfaces covered with sharp, thorny spines, the long- 

 est of which are curved distally ; these spines diminish in size slightly 



