COMPLETE HAIG: EASTERN PACIFIC PORCELLANIDAE 205 



the favored habitat ; other bottoms recorded were sand ; mud and sand ; 

 sand and kelp ; and mud and shell. 



Ovigerous females have been collected in January, February, March, 

 May, and July. 



Relationships : In the form of the carapace this species most closely 

 resembles Porcellana pulchra Stimpson, 1858, known from Japan and 

 China. In the western Pacific form the carpus, manus, and walking legs 

 are considerably longer and more slender than in P. paguriconviva. 



Remarks: Porcellana paguriconviva has been reported only from the 

 Gulf of California. The range is now extended southward to Costa Rica. 



Range: Bahia de la Magdalena, Baja California; Punta Penasco, 

 Gulf of California, south to Bahia Cocos, Costa Rica. Shore to 50 

 fathoms. 



Porcellana corbicola, new species 

 Plate IS 



Type: Holotype, ovigerous female, Allan Hancock Foundation Cat. 

 No. 375, from off Rocas Consag, Gulf of California, Mexico, 10-25 fath- 

 oms; March 24, 1937; collected during Allan Hancock Pacific Expedi- 

 tion of 1937 at Velero III station 719-37. 



Diagnosis: Carapace strongly convex transversely; frontal teeth nar- 

 row, lateral teeth pointed at tips, median tooth rounded at tip, some- 

 what broader and more produced than other two; a strong spine at 

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

 anterior margin unarmed ; fingers opening vertically ; telson five-plated. 



Description: Carapace strongly convex both transversely and front 

 to back, covered with light transverse plications ; regions not distinct ; 

 median frontal tooth covered with plumose hairs extending beyond the 

 tooth in a long tuft, carapace elsewhere with slight traces of pubescence. 

 Median frontal tooth rather narrow, rounded at tip, separated by a 

 broad U-shaped notch from lateral teeth, the latter narrower, pointed 

 at tips, directed forward, and less strongly produced. Outer orbital 

 angle produced into a small, acute tooth. Epibranchial angle marked by 

 a strong, spine-tipped tooth ; lateral margins subparallel. 



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

 tions; both flagella missing on only specimen seen. Outer maxillipeds 

 lightly rugose. 



Merus of chelipeds lightly striate on dorsal surface, anterior margin 

 with a broad, very strongly produced, rounded lobe; ventral surface 



