210 University of California Publications in Zoology (Vou. 23 
Chionoecetes tanneri Rathbun 
Chionoecetes tanneri Rathbun, Proce. U. S. Nat. Mus., 16, 76, pl. 4, figs. 1—4, 
1893; H. A. E., 10, 174, 1904; Holmes, Occas. Papers Calif. Acad. Sci., 
7, 40, 1900; Weymouth, Stanford Univ. Publ., Univ. Ser., no. 4, 35, pl. 7, 
fig. 19, 1910. 
Fig. 131. Chionoecetes tanneri, 3, X %@ (from Rathbun, U. S. N. M.). 
Characters—Carapace a little wider than long; much swollen at branchial 
regions, which are distended both vertically and laterally, concealing the lateral 
margin of the carapace; carapace covered with spines, the most conspicuous being 
arranged in irregular rows, one of which extends transversely across the anterior 
part of the gastrie region; a second row extends from behind the orbits diagonally 
backward across the branchial region; a third from near inner angle of branchial 
region almost transversely to the outer margin, from which point a row of long 
spines extends forward along the lateral margin and is continued on the pterygo- 
stomian regions; this marginal row of long spines while forming the apparent 
lateral margin really overhangs and conceals the real margin. Small sharp spines 
border the orbits, the outer margin of the postocular teeth, and the inferolateral 
and posterior margins. Second segment of abdomen of male is bent downward at 
extremities in almost a right angle; there is a transverse ridge of spiny tubercles 
on the sternum in front of the abdomen; anterior to this ridge the sternum is 
deeply excavated. 
Dimensions.—Type, male: length of carapace from base of rostral horns 119 
mm., width without spines 130 mm. 
Type Locality—Gulf of the Farallones, California, 29 fathoms (‘‘ Albatross’’ 
station 3100). 
Distribution—From Bering Sea to off San Diego, California (lat. 32° 17’ N) ; 
29 to 1625 fathoms (Rathbun). 
Genus Pelia Bell 
Carapace subpyriform. Rostrum composed of two divergent spines which are 
united at the base. Basal antennal joint elongated, its distal portion visible from 
above, at sides of rostrum; flagellum well developed. No preocular spine; post- 
ocular present; orbits small, with a superior and an inferior marginal hiatus, 
upper orbital margin smooth. First ambulatory legs much longer than the others. 
