210 University of California Publications in Zoology [Vol. 23 



Chionoecetes tanneri Rathbun 



Chionoecetes tanneri Rathbun, Proc. U. S. Nat. Mus., 16, 76, pi. 4, figs. 1-4, 

 1893; H. A. E., 10, 174, 1904; Holmes, Oecas. Papers Calif. Acad. Sei., 

 7, 40, 1900 ; Weymouth, Stanford Univ. Publ., Univ. Ser., no. 4, 35, pi. 7, 

 fig. 19, 1910. 



Fig. 131. Chionoecetes tanneri, J, X % 6 (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 gastric 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. 



