COMPLETE HAIG : EASTERN PACIFIC PORCELLANIDAE 233 



Basal segment of antenna broad, elongate, produced inward and 

 outward ; strongly produced forward and broadly in contact with an- 

 terior margin of carapace, with movable segments far removed from 

 orbit. 



Basal segment of antennule large, truncate on anterior face, without 

 spines or other projections. 



Chelipeds large, subcylindrical, often unequal in size. Walking legs 

 rather long and slender; propodus with movable accessory spinules on 

 posterior margin; dactylus very short, with two or more large, strong, 

 fixed spines, in addition to small posterior movable spinules. 



About twenty-one described species, most of them from the Indo- 

 Pacific region. 



Remarks: A few Indo-Pacific Poly onyx with spines on the lateral 

 margin of the carapace are close to certain species currently included 

 in Parcel /ana, as pointed out by Johnson (1958). When the Porcellani- 

 dae as a whole are revised, such forms may prove to be referable to 

 a distinct genus. 



Key to the Eastern Pacific Species 



la. Manus of major cheliped with a low longitudinal crest on 

 dorsal surface ; merus of walking leg 3 with five or six strong 

 spinules on posterior margin ; propodus of walking legs without 

 movable spinules on posterior margin except for three at distal 

 end confinis 



lb. Manus of major cheliped swollen on dorsal surface, without 

 a longitudinal crest; merus of walking legs with about 12 

 small spinules on posterior margin ; propodus with one or two 

 movable spinules on posterior margin in addition to three at 

 distal end 2 



2a. Propodus with two movable spinules on posterior margin in 

 addition to three posterodistal spinules (Gulf of California) 

 nitidus 



2b. Propodus with a single movable spinule on posterior margin 

 in addition to three posterodistal spinules (California and west 

 coast of Baja California) .... quadriungulatus 



