ZooL— Vol. III.] HOLMES— WEST AMERICAN CRUSTACEA. 31I 



Lepidophthalmus Eiseni sp. nov. 



Plate XXXV, Figs. 6-13. 



Rostrum small but prominent, acuminate, rounded above, and somewhat 

 upturned. The antero-lateral regions of the carapace are strengthened by a 

 more or less calcified area, the posterior margin of which is slightly raised 

 and in the form of a letter S; a similar partly calcified area on the supero- 

 posterior portion of the branchial regions; the margin of the branchial 

 regions is thickened, and separated from the main portion by a thin flexible 

 membrane; just in front of the postero-lateral angle this thickened margin is 

 expanded into a smooth, rounded sclerite in front of which the margin is 

 thin and membranaceous. Ocular peduncles oblong, the inner margins 

 straight and contiguous until a short distance behind the acute tips; cornese 

 large, occupying most of the peduncles; a prominent rounded tubercle at 

 the anterior end of the cornese next to the inner margin. Antennules with 

 the first joint short, the third slender and tapering, somewhat over twice the 

 length of the second, and furnished below with long hairs; flagella subequal 

 to the peduncle, the upper flagellum nearly naked and slightly shorter than 

 the lower one which is furnished with numerous long hairs on the lower side. 

 Antennae much longer than the antennules, but scarcely twice as long; first 

 joint with the outer margin produced into a rim which projects over the 

 opening of the green gland; last joint of the peduncle longer and much more 

 slender than the preceding; the tip of the peduncle reaches a little beyond 

 the middle of the last joint of the peduncle of the antennules. External 

 maxillipeds with the ischium and merus broadly expanded, the merus much 

 wider than long; first joint of the palp distally widened; second joint very 

 large and flattened, the inner side strongly produced, the terminal joint 

 small, curved, and articulated to the outer angle of the preceding one. 



Chelipeds unequal, smooth and glossy; the ischium of the larger cheliped 

 finely serrated below, with a slight convexity near the distal end which is 

 furnished with a few small spines; merus with the inner and outer sides flat- 

 tened and converging below; lower margin with a rounded portion which is 

 furnished with hairs and several small teeth; a prominent curved spine on 

 the outer side at the proximal end; carpus wider than long, the posterior 

 angle evenly rounded, the margins somewhat incurved; hand in the male 

 much longer than the carpus, a broad, roughened, shallow, hairy groove 

 extending backward from the gap between the fingers upon the outer side 

 of the palm, inner side with a roughened hairy area extending backward to 

 a rounded elevation at the base; a few teeth between the bases of the 

 fingers; a prominent tooth on the outer side of the inner margin of the pol- 

 lex; dactyl with several prominent teeth, the tip curved. In the female the 

 larger hand is similar to that of the male but there is no roughened patch on 

 the inner side of the palm, and the roughened groove on the outer side is 

 short and indistinct; there is a notch on the inner margin of the poUex but 

 no prominent tooth, the inner margin of the dactyl, like that of the pollex, is 

 minutely serrated but bears no teeth; the tip is curved as in the male. The 

 small cheliped is much the same in both sexes, but the carpus is relatively 

 somewhat shorter in the male; the ischium is very minutely serrated on the 



October 8, 1904. 



