THE SPIDEK CRABS OF AMERICA 517 



Lambrus crenulatus Satjssure, M6m. Soc. Phys. Hist. Nat. Geneve, vol. 



14, 1858, p. 429 [13], pi. 1, figs. 4, 4a (type-locality, les niers des Antilles; 



type in Geneva Mus.). — Desbonne and Schramm, Crust. Guadeloupe, 



1867, p. 21.— Stimpson, Bull. Mus. Comp. Zool., vol. 2, 1871, p. 129.— 



GuNDLACH and Torralbas, An. Acad. Habana, vol. 36, 1899 (1900), p. 



301, text-fig. on p. 303; reprint, 1917, p. 12, pi. [2], fig. 5. 

 Lambrus melanodadylus Desbonne in Desbonne and Schramm, Crust. 



Guadeloupe, 1867, p. 21 (type-locality, Guadeloupe; type in Guadeloupe 



Mus.?). 

 Platylambrus crenulatus Stimpson, Bull. Mus. Comp. Zool., vol. 2, 1871, 



p. 129. 

 Platylambrus serratus A. Milne Edwards, Crust. R^g. Mex., 1878, p. 156 



pi. 30, figs. 1-lc. 

 Lambrus granulatus Kingslet, Proc. Boston Soc. Nat. Hist., vol. 20 



1879, p. 150 (type-locality, Tortugas, Florida, 9 fathoms; cotype in 



U. S. Nat. Mus.)! 

 Parthenope (Platylambrus) crenulata Verrill, Trans. Conn. Acad. Arts 



and Sci., vol. 13, 1908, p. 417, pi. 28, fig. 5. 

 Parthenope crenulata Verrill, Trans. Conn. Acad. Arts and Sci., vol. 26, 



1922, p. 155, text-fig. 12. 



Diagnosis. — Carapace flattened, with a large lateral spine. Sub- 

 orbital and subhepatic regions deeply and smoothlj^ excavated. 

 Chelipeds over three times in male, two and a half times in female, 

 as long as carapace, miiltidentate. 



Description. — Carapace depressed, about one and a half times as 

 broad as long, antero-lateral margin of branchial region very convex, 

 separated by a long, flat, outward-pointing spine from the concave 

 postero-lateral margin, posterior margin wide and slightly convex. 

 Elevations ornamented with numerous unequal, granulated tubercles, 

 some of those on branchial regions sharp. The deepest depression 

 is that between gastric and branchial regions. Rostrimi short, 

 channeled, tridentate; below and outside each lateral tooth a smaller, 

 narrower tooth. Seven or eight triangular teeth on the branchial 

 margin in advance of the lateral spine. Of the tubercles on the 

 posterior and postero-lateral margins seven are noticeably larger 

 than the others, and each terminates a longitudinal or oblique line of 

 tubercles. An excavation of pterygostomian and subhepatic regions 

 reaches infero-exterior margin of orbit, forming, when the chelipeds 

 are retracted, covered afferent passages, the external apertures of 

 which are seen between base of finger and margin of orbit. Cheli- 

 peds long and flattened, lower face smooth, outer margin coarsely 

 serrated, nine teeth, alternately large and small, en hand; teeth of 

 inner margin smaller and more numerous (15 or 16 en hand); upper 

 surface showing a few tubercles on hand but more on arm, where there 

 is a longitudinal row near middle. Legs slightly spinulous, in the 

 main smooth; first pair not reaching end of arm.. Abdomen of male 

 with segments three to five fused, segment six with a median spine. 



