ZOOL.— Vol. III.] HOLMES— WEST AMERICAN CRUSTACEA. 313 



spine behind the antennal spine and in front of and external to the outer one 

 in the transverse row; all the spines are prolonged posteriorly into a carina. 

 Ocular peduncles short and stout, with a prominent rounded tubercle on the 

 upper side at the margin of the large cornea. Antennules with a triangular 

 tooth at the distal end of the first basal joint; outer flagellum flattened; inner 

 flagellum much more slender than the outer one and scarcely half as long. 

 Antennal scale short and broad, scarcely \ the length of the carapace; 

 peduncle nearly reaching the tip of the acicle. Anterior chelipeds stout, a 

 spine on the lower side of the merus; carpus with a spine on the outer por- 

 tion of the lower surface; hand oblong, inflated, about twice as long as wide, 

 the margin against which the dactyl closes evenly convex and oblique, some- 

 what more nearly longitudinal than transverse: poUex spinous, oblique. 

 Second pair of chelipeds very slender, about reaching the tip of the first pair. 

 Abdominal segments rounded above. Telson rounded above but slightly 

 flattened towards the base, much longer than the last abdominal segment 

 but shorter than the carapace; the upper side is armed with 2 pairs of 

 spinules; tip rounded and furnished with several long setse. 



Length of body 21 mm., carapace 6 mm., telson 4 mm., acicle 2.5 mm. 



Described from the two specimens from Magdalena Bay, 

 Lower California, which Lockington referred to munitus. 



Type No. 3168 of the collection of the California Acad- 

 emy of Sciences; original number 109. 



This species differs from C munitus Dana in having a 

 longer rostrum, much shorter inner flagellum of the anten- 

 nules, stouter hand, longer sixth abdominal segment, and 

 more slender uropods. 



Order ARTHROSTRACA. 



Suborder AMPHIPODA. 



Family LYSIANASSID^. 



Anonyx nugax (Phiffs). 



Plate XXXV, Figs. 17-19; Plate XXXVI, Fig. 20. 



Cancer nugax Phipps, Voy. North Pole, p. 192, pi. 12, fig. 3, 1774. 

 Anonyx nugax Miers, Ann. Nat. Hist. (4), v. 19, p. 135, 1877. 

 Lysianassa Fisheri Lockington, Proc. Calif. Acad. Sci. v. 7, p. 48, 1877. 



I have examined Lockington's type specimen of Lysi- 

 anassa Fisheri which was taken on the northern coast of 

 Alaska. The specimen was dried and imperfect when it 

 came into Mr. Lockington's hands; after soaking it for 



