112 CALIFORNIA ACADEMY OF SCIENCES. 



Pleuroncodes planipes St. 



Pleuroncodes planipes Stimpson, Ann. N. Y. Lye. Nat. Hist., Vol. VII, 

 1860, p. 245. A. Miltstk-Edwards, and Bouvier, Ann. Sci. Nat. (7), 

 T. XVI, 1894, pp. 248 and 245. 



Closely allied to P. monodon from the coast of Chili. Carapace crossed 

 \>y setose striae but, with the exception of a few spinules behind the supra- 

 orbital teeth, devoid of spines. Eostrum long, very slender, scabrous 

 above, and continued back upon the carapace as a carina; supraorbital 

 teeth spine-like. A spine at the rounded autero-lateral angle of the cara- 

 pace, behind which there are a few spines on the margin. Ocular ped- 

 uncles not reaching the tip of the rostrum; eyes large. Maxillipeds with 

 a small spine at the antero-internal angle of the ischium; penultimate 

 joint moderately dilated. Chelipeds long, slender, and spinous; merus 

 slender, trigonous, spinulous, especially on the edges, and generally ex- 

 ceeding the tip of the rostrum; carpus spinous; hand long, narrow, 

 spinulous, with the upper and lower margins parallel; fingers slender, 

 straight, longer than the palm, the tips curved. Ambulatory legs sca- 

 brous, ciliated, with the penultimate joints flattened. Abdomen devoid of 

 spines. 



''This species," says Stimpson, ''lives in the open 

 -ocean, and is sometimes found in vast quantities in the 

 Pacific off the American Coast. It was taken by Mr. 

 Grayson in N. lat. 24°, W. Ion. 130°. In March, 1859, 

 it was thrown ashore in considerable numbers at Mon- 

 terey, California.'' 



Ninety miles southwest of San Francisco, Calif.! 150 

 ,miles southwest of Cape St. Lucas, Lower California, 

 ':numerous specimens! 



Subtribe PAGURIDEA. 



Carapace with a lateral (anomoural) line. Pterygostomian regions free 

 from the epistome. External antennae with a five-jointed peduncle and, 

 generally, with an acute, movable acicle. First pair of pereopods large, 

 chelate, often unequal; last pair small and generally more or less chelate. 

 Abdomen asymmetrical, the lower and often the upper side membranous; 

 the appendages generally reduced or absent, and commonly occurring only 

 •on one side. 



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