92 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 24 



front triangular, strongly produced, with a deep median sulcus; no 

 supraocular spine ; inner orbital angle not produced. Outer orbital angle 

 only slightly produced. No epibranchial spine. Carapace naked. 



First movable segment of antenna with a granular, lamellar lobe on 

 anterior margin ; second roughly granular ; third more or less smooth ; 

 flagellum with distinct hairs. Outer maxillipeds finely rugose. 



Chelipeds covered with small granules, devoid of pubescence. Merus 

 with a strongly projecting granular lobe on anterior margin. Carpus one 

 and a half to two times as long as wide ; a strong lobe on anterior mar- 

 gin at proximal end, anterior and posterior margins converging distally 

 from its highest point ; posterior margin rugose, the rugae forming a 

 rough, obliquely rugose ridge along posterior margin, ending distally 

 in a strong tooth. Outer margin of manus with a smooth, narrow 

 ridge. Gape with a thick pubescence, produced into a short tuft near 

 proximal end of fingers. 



Walking legs rugose and granular like carpus and chelipeds. Merus 

 unarmed, naked or with traces of a short pubescence, that of leg 3 in- 

 flated ; carpus nearly devoid of hairs ; propodus and dactylus covered 

 with tufts of setae. 



Material examined: See Table 26. 



Measurements: Males, 4.5 to 21.1 mm; non-ovigerous females, 4.5 

 to 17.3 mm; ovigerous females, 6.0 to 18.1 mm. Stimpson (1857b) 

 gave the length for a male from the type series of Porcellana rupicola 

 as .85 inches (about 21 mm). Hart (1940) reported a female speci- 

 men 24 mm in length. 



Color: The color in live specimens has not been recorded. Randall 

 (1839) gave the color as reddish brown anteriorly, blue posteriorly, 

 walking legs blue and white striped; Stimpson (1857b), for Porcellana 

 rupicola, as dark purplish red. These color notes were probably from 

 preserved material. Specimens in the collection of the Allan Hancock 

 Foundation are usually a dark rust color, fading to buff in older mate- 

 rial. Some individuals examined had traces of dark stripes on the 

 walking legs. 



Ecology : This species is almost exclusively littoral ; it is very com- 

 mon among rocks, and beneath beds of mussels, sponges, and tuni- 

 cates (Hewatt). According to Stimpson (1857b) it prefers an open 

 shore with clear water. In British Columbia, it occurs only on the ex- 

 posed outer coast of Vancouver Island and the Queen Charlotte Islands 

 (Hart). It is common in the high- and mid-tide horizons. In Oregon, 



