Notes mt North American Crustacea. 237 



nearly as in P. cylindvica^ but the clielipeds are like those of 

 P. chaetopterana. 



Dredged in six fathoms, sandy mud, off the mouth of Beau- 

 fort Harbor, ]^.C. 



CALAPPOIDEA. 



Calappa xantusiana, nov. sp. 



Allied to C. marmorata in its little-protruded front and in the cha- 

 racter of the surface. It is, however, much narrower and more convex 

 than that species, and the triangular teeth of the postero-lateral margins 

 are carinated along the middle above, somewhat as in C. gallus, but 

 more obliquely. Also, there are numerous short transverse crenulated 

 carinae or ridges on the surface near the posterior margin. The upper 

 surface is elsewhere naked and glabrous, although depresso-papillose 

 and crowdedly granulated, the granules appearing as if covered with 

 a kind of glazing which fills up their interstices. The frontal sinuated 

 margin and teeth are obtuse, and there is no median denticle. The 

 superior crests of the hands are six-toothed, the teeth being less acute 

 and smoother, or more regularly crowdedly granulated than in C. mar- 

 morata. Length of carapax in a male, 1.15 ; greatest breadth (pos- 

 teriorly), 1.46 inch. 



Found at Cape St. Lucas by Mr. John Xantus. 

 Cyclois bairdii, nov. sp. 



Carapax broader than long, regularly convex ; surface more even than 

 in C. cristata, but with the median regions sufficiently well defined. 

 Young specimens are, however, more uneven, and sometimes tubercu- 

 lated. Front tridentate. Antero-lateral margin minutely toothed; every 

 third or fourth tooth being larger than the others ; posterior tooth 

 larger than the rest, but not projecting beyond the level of the convex 

 portion of the lateral margin where the carapax is broadest. External 

 crest of meros-joint in the chelipeds granulated, bidentate ; — a short 



