166 BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



Of the ambulator}'' legs the first is feeble, reaching scarcely to 

 middle of propodus of second leg; second leg much larger but of 

 similar shape, reaching middle of dactylus of third leg; third leg 

 very stout, with shorter dactylus than two preceding, the propodal 

 joint much wider at distal end than base of dactylus; fourth leg 

 shortest, not exceeding merus of third, its last 3 segments similar to 

 those of third. 



Description of male. Differs from female in smaller size, shorter 

 posterior margin, slightly projecting front, with deep median 

 groove, and longer antero-lateral marginal ridge. Abdomen wider 

 at the first 3 segments than the sternum on either side, and tapering 

 rapidly from base of third to middle of sixth segment, last segment 

 wider than long, evenly rounded. 



Measurements. Female (20860), length of carapace 4, width of 

 same 10, length of third leg about 10 mm. Male (Trinidad), length 

 of carapace 3.2, width of same 6.8 mm. 



Habitat. Usually found commensal in leathery tubes of annelids 

 (Holmes). 



Range. Puget Sound to San Diego, California. 



Material examined. 



Puget Sound; 1907; 1 male (Stanford Univ.). 



Friday Harbor, Washington; July 1, 1916; Evelyn D. Way; in 

 tubes of Amphitrite; 4 females (49952). 



Trinidad, California ; June 2, 1896 ; S. J. Holmes, collector ; 1 fe- 

 male, ovigerous, from calcareous tube of worm, cotype (20860). 



Trinidad, California; June 27, 1911; W. F. Thompson; 1 male, 

 4 females (3 ovig.) (Stanford Univ.). 



Mendocino, California; A. Agassiz; 1 female ovig. (1048. 

 M. C. Z.). 



Pacific Grove, California; 2 females y. (Stanford Univ.). 



Off Point Conception, California : lat. 34 25' 25" N. ; long. 120 

 20' 00" W. ; 31 fathoms ; gy. S. brk. Sh. ; Jan. 8, 1889 ; station 2908, 

 steamer Albatross; 1 female (24752). 



PINNIXA WEYMOUTHI, new species. 



Plate 36, figs. 9 and 10. 



Pinnixa californiensis WEYMOUTH, Leland Stanford Jr. Univ. Publ., Uiiiv. 



ser. No. 4, 1910, p. 56 (part: young female from Pacific Grove). 

 Pinnixa faba WEYMOUTH, Leland Stanford Jr. Univ. Publ., Univ. ser. No. 



4. 1910, p. 59, text-fig. 7 (part; not synonymy). 



Type-locality. Monterey Bay, California ; 5 fathoms ; male holo- 

 type in Stanford University. 



Diagnosis. Carapace narrow, sides subtruncate. Chelae pubes- 

 cent, thumb horizontal. Dact} 7 li of legs slightly curved. 



