198 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 24 



2b. No notch on lateral margin at cervical groove ; manus broad, 

 its surface flat 3 



3a. Epibranchial angle with two or three spinules; frontal teeth 

 pointed at tips, median one spinulate on margins 



cancrisocialis 



3b. Epibranchial angle unarmed ; frontal teeth rounded at tips, 

 median one not spinulate paguriconviva 



Porcellana hancocki Glassell 

 Plate 38, fig. 3; text-fig. 9(1) 



Porcellana hancocki Glassell, 1937, p. 87 (listed only) ; 1938b, p. 5 

 (description; type locality, Bahia de los Angeles, Gulf of Cali- 

 fornia). 



Previous records: Gulf of California. Bahia de los Angeles: Velero 

 III (Glassell 1938). Bahia de Santa Ines; Arena Bank: Zaca (Glas- 

 sell 1937). 



Diagnosis: Carapace strongly convex transversely; frontal teeth 

 narrow, pointed at tips, median tooth somewhat broader and more 

 produced than other two; lateral margin with a deep, narrow notch at 

 cervical groove, followed in smaller specimens by a small spine at epi- 

 branchial angle; carpus about one and a half times as long as wide, 

 with a low rounded lobe on proximal third of anterior margin, the 

 lobe spine-tipped in small specimens; fingers opening horizontally or 

 somewhat obliquely; telson seven-plated. 



Description: Carapace covered with faint plications and flattened 

 fine granules; strongly convex transversely, highest at midline; regions 

 not distinct except for protogastric lobes, the latter fringed with plu- 

 mose hairs; carapace elsewhere faintly pubescent, especially on frontal 

 region. Frontal teeth narrow, acute, directed forward, all extending be- 

 yond eyes; median tooth with a distinct longitudinal groove, some- 

 what more produced and broader than lateral teeth and separated from 

 them by a wide V-shaped notch. Outer orbital angle sometimes with a 

 small, short tooth. Lateral margin with a deep, narrow, V-shaped 

 notch at cervical groove ; epibranchial angle with a small spine in younger 

 specimens, this spine obsolescent in adults. 



Movable segments of antenna more or less smooth, without pro- 

 jections; flagellum naked or with vestigial hairs visible only under 

 magnification. Outer maxillipeds lightly rugose, ischium covered with 

 long plumose hairs. 



