COMPLETE 



HAIG : EASTERN PACIFIC PORCELLANIDAE 



181 



lobe on proximal half of anterior margin, joining distal portion of 

 margin in a broad curve. 



Description: Carapace very strongly convex front to back, highest 

 at epibranchial level; finely punctate or granulate anteriorly, other- 

 wise nearly smooth, devoid of hairs; regions not distinct. Front tri- 

 lobate, median lobe broadly triangular, pointed at tip, much more 

 strongly produced than lateral lobes, latter narrow and rounded; in 

 frontal view, median lobe showing a narrow, acute, strongly deflexed 

 extension, present to a lesser degree on lateral lobes also. Orbital mar- 

 gin forming a nearly straight line from lateral lobe of front to groove 

 separating hepatic and epibranchial regions; outer orbital angle slightly 

 produced into an acute tooth, latter deflexed like tip of frontal lobes 

 and scarcely visible in dorsal view. 



Text-fig. 6. Right antennule of 1, Allopetrolisthes angulosus, x 7^ ; 2, A. punc- 

 tatus, X 4; 3, A. spinifrons, x 9. 



First movable segment of antenna smooth or granulate, with a low 

 crest on anterior margin; second and third covered with tubercles or 

 large granules; flagellum with vestigial hairs. Ischium of outer maxil- 

 lipeds smooth or slightly granular, other segments roughly granular. 



Chelipeds smooth or lightly granular, devoid of hairs. Merus armed 

 on anterior margin with a narrow, rounded lobe. Carpus about one and 

 a half times as long as broad, a strongly projecting, angular lobe occu- 

 pying proximal half of anterior margin, and joining distal portion of 

 margin in a broad curve; a smooth, longitudinal crest on dorsal sur- 

 face, and another along posterior margin. Manus with a smooth, longi- 

 tudinal crest, extending to base of dactylus; outer margin with a thin 

 edge. Fingers smooth, meeting entire length or slightly gaping, crossing 

 at tips; gape without pubescence. 



Merus of walking legs devoid of hairs, greatly expanded and flat- 

 tened, with a high, sharp crest on anterior margin; carpus devoid of 

 hairs, with an anterior crest and another on dorsal surface; propodus 



