164 BULLETIN 152, UNITED STATES NATIONAL MUSEUM 



end. Carpus with outer surface tuberculate, inner margin thick, 

 rough with sharp spinules; inner angle prominent, rectangular. 

 Manus very deep distally, upper surface spinulous and tuberculate; 

 fixed finger short, triangular; dactylus wide, upper margin arcuate, 

 spinulous. Smaller cheliped very spinulous, upper margin spinous, 

 fingers proportionally longer and more slender, gaping slightly at 

 base. Merus of legs spinous above, and in last pair spinulous on 

 hinder surface; carpus spinulous in first three pairs; dactyli very 

 long and slender. Legs fringed with long silky hair, also upper margin 

 of left cheliped, lower margin of carapace, and margins of abdomen, 

 sternum, and maxilliped. Sternum granulate. Terminal segment 

 of male abdomen broader than long, not invaginated in the preceding 

 segment. Median third of abdomen spinulous, spinules diminishing^ 

 in size from first to sixth segment. 



Measurements. — Male holotype, length of carapace 42.5, width of 

 same 36.5, length of right cheliped 72, of left one 37.5 mm. 



Range. — East coast of Mexico, deep water. 



Material examined. -^O^ Cozumel Island, Yucatan, 231 fathoms,^ 

 station 2359, Albatross; one male holotype (9558). 



Genus TRACHYCARCINUS Faxon 



Trachycarcinus Faxon, Bull. Mus. Comp. Zool., vol. 24, 1893, p. 156; type, 

 T. coraUinus Faxon; Mem. Mm-. Comp. Zool., vol. 18, 1895, p. 25. — 

 Alcock, Journ. Asiat. Soc. Bengal, vol. 68, 1899, p. 100. 



Carapace pentagonal, very convex, antero-lateral margins long, 

 nearly straight, toothed. Front narrow, produced, three toothed 

 orspined. Orbits large, with forward aspect, imperfect; two hiatuses 

 above, one below, and one at inner angle; lower wall formed chiefly 

 by the carapace. Anterior margin of buccal cavity not distinctly 

 defined, epistome short, ridges of endostome developed. Sternum 

 long and rather narrow. Abdomen of male narrow. Eyestalks 

 very small, retractile within orbits; eyes dull and faintly pigmented. 

 Antennules longitudinally folded. Antennae lying in inner hiatus of 

 orbit, basal segment but slightly enlarged, not filling hiatus at inner 

 angle of orbit nor attaining to the front, subc3dindrical, unarmed, 

 imperfectly fused with carapace; second article longer and slenderer 

 than first, the third article about equal to the second in length but 

 slenderer; all are furnished with long, coarse setae; antenna less 

 than half as long as carapace. Ischium of outer maxillipeds produced 

 at antero-internal angle; merus rounded at antero-external angle, 

 obliquely truncated without emargination at antero-internal angle. 

 Legs of moderate length; dactyli styliform, straight, slender, longer 

 than the penult article. 



