COMPLETE HAIG : EASTERN PACIFIC PORCELLANIDAE 19 



anterior margin. Carpus armed on anterior margin with three narrow, 

 wide-set teeth, proximal one the largest, distal not always developed ; 

 posterodistal angle usually produced into a small spine. Manus narrow, 

 sometimes more so than carpus, granules more projecting toward outer 

 margin; fingers long and slender, fitting together for their entire 

 length, gape without pubescence. 



Walking legs lightly granular or punctate. Merus, carpus, and pro- 

 podus naked or with a few scattered hairs; dactylus with a thick, short 

 tuft of hairs on posterior margin. 



Variations: From a survey of the literature and examination of 

 specimens, it appears that in general the two lateral lobes of the front 

 begin to develop when the crab attains a length of between 2.5 and 5.0 

 mm. In specimens over 5.0 mm long, the lateral lobes are almost in- 

 variably present, although they may be very small. 



The third carpal spine is usually present in specimens of 6.0 mm and 

 over and absent in those smaller than 6.0 mm; however, one 3.7 mm 

 specimen examined had three distinct spines, and a 6.5 mm specimen 

 had only two. The carpus appears to become considerably longer in pro- 

 portion to its width with increase in size of the crab. 



Material examined: See Table 2. 



Measurements: Of material examined in connection with the pres- 

 ent report: males, 3.7 to 6.5 mm; non-ovigerous females, 2.5 to 3.7 

 mm; ovigerous females, 4.8 to 12.0 mm. Of material examined for an 

 earlier report (Haig, 1955): males, 2.3 to 8.0 mm; non-ovigerous fe- 

 males, 2.0 to 5.3 mm; ovigerous females, 4.3 to 8.7 mm. The only 

 recorded measurements to exceed these are Cano's 11 mm for the male 

 type of Porcellana pulchellula, and Lenz's 13 mm for a specimen of un- 

 specified sex. The type of Porcellana mitra was recorded as 2^ lines 

 (5.3 mm) ; of P. spinosa, 3 lines (6.0 mm) ; and of P. patagonica, 

 about 8 mm. During a visit to the British Museum (Natural History) in 

 1953, the writer examined two specimens of P. patagonica from Port 

 Otway, Chile, labelled "Type?"; they were an 8.1 mm male and a 7.8 

 mm female. 



Color: Liopetrolisthes 7nitra has two characteristic color patterns, 

 both of which may occur in the same individual; one consists of a 

 broad white longitudinal stripe on the carapace, and the other of mar- 

 blings and stripings on the carapace, chelipeds, walking legs, and abdo- 

 men. These patterns have been mentioned or figured by Dana (1855), 



