Boone, Crustacea, Cruises of "Eagle" and "Ara," 1921-28 55 



numerous microscopic granules. Front produced to a small median 

 point ; pterygostomian region angulated, with one tooth ; median pos- 

 terior region armed with one tooth, outside of which and a little below 

 it on each side is another similar tooth. Chelipeds elongate, mod- 

 erately slender. 



Type : Linnaeus ' type came from the Antilles. 



DiSTKiBUTiON : Rather sparsely known from North Carolina south- 

 ward through the AVest Indies; Porto Rico, and Gulf of Mexico, to 

 Sabanilla, Colombia. Marcgrave recorded it from Brazil nearly one 

 hundred and fifty years ago. 



Mateeial examined : One large female from Colon, Panama, 1926, 

 dredged in shallow water ; one male from the same locality. One small 

 male, taken in dragnet, 2 fms., Limon Bay, Panama, January 21, 1928. 



Color: Plum purplish, with irregular marmorations of darker 

 color; granules white or tinged with plum red. 



Technical description : Carapace globose, convex, sparsely covered 

 with microscopic granules which form a visible beading along the mar- 

 gin ; frontal region, narrow, depressed medially and produced to a weak 

 tooth, inner and outer orbital angles blunted; the upper orbital sur- 

 faces with three sutures ; the dentate angle of the branchial groove is 

 visible dorsally. The pterygostomian region is produced, decidedly 

 angulated and armed with an out-pointing tooth. There are three spines 

 on the posterior region, one placed medially, directed outward and 

 upward and on either side and a little below this is a similar spine. 

 The female abdomen is wide, the first, second and third segments 

 narrow, hinge-like, arched medially, their lateral margins quite arcu- 

 ate; the fourth, fifth and sixth segments are completely fused form- 

 ing a broad, subcircular shield that covers practically the entire sternal 

 region between the legs, the seventh segment is small, triangulate, 

 with the distal end rounded. The male abdomen is triangulate, de- 

 cidedly wider in punctata, i.e., nearly a third broader than that of 

 orbicularis; the first, second and third joints are narrow, hinge-like; 

 the fourth, fifth and sixth segments are completely anchylosed; the 

 seventh is small, triangulate, with the tip rounded. 



The chelipeds and ambulatories are quite similar to those of orbicu- 

 laris, described on page 58, except that they are less granulose, the 

 upper male finger in punctata is not quite so curved and long, and the 

 fingers have no gape. 



