150 University of California Publications in Zoology [Vol. 23 



Hapalogaster grebnitzkii Schalfeew 



Plate 29, figure 2 



Hapalogaster grebnitzkii Schalfeew, Melanges Biol. 13, 329, figs. 3a-3Z>, 

 Bull. Acad. Imp. Sci. St. Petersb., 35, 335, 1892; Bouvier, Ann. Sci. 

 Nat. (8), 1, 19, 1896; Holmes, Oeeas. Papers Calif. Acad. Sei., 7, 115, 

 1900; Bathbun, H. A. E., 10, 163, 1904. 



Fig. 96. Hapalogaster grebnitzkii, dorsal view of carapace, reduced (after 

 Schalfeew). 



Characters. — Carapace and legs finely pubescent; margin of carapace behind 

 the cervical groove armed with five spines, which decrease in size posteriorly. 

 Legs armed with setose spines. Hand of right, or larger cheliped armed with two 

 rows of spines on the outer surface and a row of small spines on the inner edge; 

 there is a broad smooth unarmed interval between the two rows of spines on the 

 outer surface. Abdomen as in H. cavicauda. 



Dimensions. — Largest specimen of type lot: length of carapace 18 mm., width 

 18.5 mm. 



Type Localities.- — Bering Islands and Kadiak, Alaska. 



Distribution. — From Bering Sea off the Pribilofs and Cape Newenham south- 

 ward, along the Aleutian Islands to Sitka, Alaska; Bering Island; Humboldt Bay, 

 California. 



Bemarks. — Bouvier thinks that this species is but a variety of H. mertensii 

 Brandt, which ranges from Atka, one of the Aleutian Islands, eastward and south- 

 ward to Puget Sound. In view of their overlapping ranges this might well be 

 the case. The chief difference between them is in the number of longitudinal rows 

 of spines on the right hand: H. grebnitzkii has three, while H. mertensii has four. 

 Holmes notes still another difference, viz., the absence of a spine behind the gape 

 of the fingers of the smaller hand of H. grebnitzkii; but for this difference the 

 small hands of each would be spined alike. 



Genus Oedignathus Benedict 



Carapace moderately convex, somewhat roughened, granular on upper surface, 

 slightly setose, but not hairy; lateral margins unarmed. Ambulatory legs sub- 

 cylindrical, very sparsely haired. Abdomen much as in Hapalogaster. 



