524 BULLETIN 129, UNITED STATES NATIONAL. MUSEUM 



such a degree; anterior margin of carpus and propodus of all the legs 

 finely spinulous or denticulate. 



Measurements. — Female (21966), length of carapace 29.7, width of 

 same 40.3, length of cheliped 76.4 mm. 



Range. — From west coast of Lower California, Mexico, to Panama 

 and the Galapagos Islands. Depth, 31 to 80 fathoms. 



Material examined. — See table, page 523. 



PARTHENOPE (PLATYLAMBRUS) DEPRESSIUSCULA (Stimpson) 



Plate 188 



Lambrus depressiusculus Stimpson, Ann. Lye. Nat. Hist. New York, vol. 10 

 1871, p. 101 [128] (type-locality, Manzanillo, Mexico; type not extant). — 

 A. Milne Edwards, Crust. R6g. Mex., 1878, p. 155. 



Diagnosis. — Branchial region elongate. A long spine at end of 

 branchial ridge and at lateral angle. No large median tubercle on 

 posterior margin. No spine on rostrum below lateral teeth. 



Description. — Body depressed though much less so than in P. 

 serrata. Carapace two-fifths broader than long, regions moderately 

 prominent, the cardiac region most so; surface covered with scattered, 

 berried tubercles, irregular in size. Branchial region broadly ex- 

 panded. Lateral margin armed with 14 or 15 spiniform, granulated 

 teeth; two of these are in front of the cervical suture, and five on the 

 post-lateral margin; of the latter, the second is the longest of all, 

 recurved, and is at the end of the branchial ridge. The spine at the 

 lateral angle, at the widest part of the carapace, is a little longer than 

 those on either side of it. Intestinal region broad, projecting but little 

 beyond line of postero-lateral angles; it is bordered by seven tubercles, 

 of which the end ones are the largest and the two either side of the 

 median one next in size. Frontal region concave; rostrum small, 

 triangular or trilobate, horizontal. Subhepatic and pterygostomian 

 regions moderately guttered. Upper surface of merus of cheliped 

 armed with a row of about five unequal tubercles; margins of merus 

 and manus armed with numerous spiniform teeth, of which there are 

 10 or 11 on outer margin of hand; teeth granulated like those of 

 carapace but not ramose; beneath, the hands are ornamented with 

 longitudinal rows of small, smooth tubercles, largest along inner edge 

 and fading out toward exterior margin. Legs slightly compressed, not 

 cristate, smooth and unarmed; last two and a half joints furred. A 

 small, slender spine on penult joint of male abdomen; female abdomen 

 furred. 



Measurements. — ^Male, holotype, length of carapace 21.6, width 

 including spines 29.2, length of hand 28.7 (Stimpson) . Female oviger- 

 ous (17866), length of carapace 26.4, width including spines 35.2, 

 length of hand 28.8 mm. 



