OXYSTOMATOUS AND ALLIED CRABS OF AMERICA H^ 



of meriis of outer maxillipeds projecting slightly in advance of median 

 sinus of front. 



Chelipeds equal, rather short, stout, coarsely scabrous-granulate. 

 Merus stout, unarmed. Carpus broader than long, having a shallow, 

 platelike, blunt projection along its outer surface, a short blunt 

 tooth at inner angle. Palm about as broad as long, bearing a stout 

 blunt spine or tooth on outer side at articulation of carpus, and a 

 lower, less conspicuous tooth at articulation of fingers; two feebly 

 marked carinae, one connecting the two teeth, the other lower down. 

 Digits longer than upper margin of palm, bent down, not gaping, 

 pollex much stouter than dactylus, prehensile edges denticulate; 

 dactylus with a superior longitudinal groove, inner superior margin 

 subacute and continuous with that of palm. First ambulatory about 

 twice as long as carapace, dactylus longer than propodus; second 

 ambulatory exceeding the first by half the length of dactylus; third 

 leg half as long as second, propodus thick, horn-shaped, dactylus 

 equall}^ long and curved, but slender; last leg similar, but longer and 

 narrower. 



Color. — Carapace of some specimens speclded with small black 

 spots, in alcohol. Of the specimens from station 284, two (the 

 largest and smallest) had a brown V on the back, on a china white 

 ground; one was more or less pure china white. 



Measurements. — Male (67437), length of carapace to end of rostral 

 lobe 3.7, width 4 mm. Female, from the same gathering, length 3.5, 

 width 4 mm. 



Range. — Southern California; Mexico; shallow water to 40 

 fathoms. 



Material examined. — See table 36, page 116. 



CLYTHROCERUS LAMINATUS Rathbun 



Plate SO, Figuhes 1-4 



Clythrocerus lominatus Rathbun, Proc. Biol. Soc. Washington, vol. 48, p. 2; 

 1935 (type locality, Wenman Island, Galapagos Islands, 100-150 fathoms, 

 male holotype, U.S.N. M. no. 69221). 



Diagnosis. — Carapace wider than long. One lateral spine. Wrist 

 of male with a large square plate on inner edge. 



Description. — Carapace a little broader than long, measured on 

 median line. A median furrow on frontal surface; two longitudinal 

 furrows on gastric region and one on either side of cardiac region; a 

 transverse furrow curved forward behind each orbit. Surface mi- 

 nutely granulate. Frontal teeth broad, subacute, sides slightly concave, 

 at the outer end terminating in a small rectangular tooth. Outer 

 orbital tooth bluntly rounded and pointing almost directly forward. 

 Lateral marginal tooth a little in front of widest part of carapace; 

 tooth acute, outer margin more than twice as long as inner margin, 

 which is nearly transverse. 



