OXYSTOMATOUS AND ALLIED CRABS OF AMERICA QQ 



susceptible of being folded under the front and by the shorter and 

 stronger feet. 



Gulf of Mexico to Leeward Islands; 70 to 300 fathoms. 



KEY TO THE SPECIES OF THE GENUS CYMOPOLUS 



A'. Sides of carapace nearly parallel. Cornea black asper (p. 99) 



A2. Carapace widest in front of middle. Cornea light brown. _ agassizii (p. 100) 



CYMOPOLUS ASPER A. Milne Edwards 



Plate 29, Figures 5-8 



Cymopolus asper A. Milne Edwards, Bull. Mus. Comp. ZooL, vol. 8, p. 27 

 (part), 1880 (type locality, Montserrat, 148 fathoms; type in M. C. Z.). — 

 Bouvier, Bull. Soc. Philom. Paris, ser. 8, vol. 9, p. 66 [13] (part), 1898.— 

 A. Milne Edwards and Bouvier, Mem. Mus. Comp. Zool., vol. 27, p. 74, 

 pi. 14, figs. 1-6, pi. 15, fig. 7, 1902 (not all synonymy). 



Diagnosis. — Sides of carapace nearly parallel. Cornea black. 

 Merus of outer maxillipeds subquadrilateral, inner margin twice as 

 long as outer. 



Description. — Carapace thick, sides nearly parallel, surface covered 

 with numerous spines of different sizes and very often bent in a hook 

 at the end. Branchial suture very narrow, cervical suture wider, 

 continued on the sides. Cardiac area in the form of a vase, the neck 

 joining the gastric pentagon, which includes the meso-, meta-, and 

 urogastric lobes; this pentagon has convex borders toward the median 

 line; it is very prominent in the wide part and gradually narrows to a 

 point; it is covered with spines of medium size and dominated on 

 either side by three conical prominences, two of which are epigastric 

 and the third anteriobranchial. These prominences are covered 

 with long and strong crowded spines; there are similar ones on outer 

 part of epigastric lobe, at antero-external angle of carapace, and a 

 little within this last one, that corresponds to a hepatic lobe. This 

 last belongs on the incHned part where the carapace is directed 

 vertically do\vnward to form the pterygostomian region. These 

 regions, as well as the flanks and almost the whole of the branchial 

 area, are armed with stronger spines than those on the cardiac region 

 and the gastric pentagon. There are especially strong spines on the 

 pterygostomian region outside the anterior border of the endostome. 

 Some sparse hairs among the carapace spines. Kostrum triangular, 

 concave above, strongly deflexed; behind the eyes the margins show 

 on each side a strong conical prominence of large spmes; in front a 

 series of six or seven strong, arcuate, marginal spines on each margin 

 besides the terminal spine. Below, the rostrum is convex and pre- 

 sents the form of a roof with two sides, the edge of which has two 

 strong spines directed backward; these spines conceal the point 

 where the rostrum is attached to the epistomian region. 



