in the Museum of the Smithsonian Institution. 109 



I'unning parallel and near to the antero-exterior margin ; above this 

 groove there are two tvibercles, separated from each other by a sliort 

 groove placed at right angles with the first. 



Dimensions of a male specimen : Length of carapax, 0.34 ; breadth, 

 0.53 inch. 



Cape St. Lucas. 



Piluniiiii§ clepressiis, nov. sp. 



Body depressed ; carapax for the most part flattened and naked, 

 but slightly curved, pilose and roughened toward the anterior and 

 antero-lateral margins. Prontal margin spinulose. Margins of the 

 orbits above and below armed with spiniform teeth. Antero-lateral 

 margin with three spiniform teeth besides the angle of the orbit, 

 which, like the next lateral tooth, is bifid. Subhepatic tooth min\ite. 

 Subhepatic and suborbital I'egions covered with sharp granules con- 

 cealed beneath pubescence. Feet pilose and spinulose ; spinules 

 shorter than in P. Xantusii. Greater cheliped naked and obsoletely 

 granulated on the larger part of its outer surface. 



Dimensions of a male specimen : Length of carapax, 0.35 ; breadth, 

 0.47 inch. 



Cape St. Lucas. J. Xantus. 



Pil8iEiBiiii§ ceratoidi^. 



Pdummis ceratopus Stimpson, Notes on N. American Cnistacea, p. 87. 

 Pilumnus? Desbonne et Schramm, Cnast. de la Guadeloupe, p. 33; pi. iii, 

 figs. 9, 10. 



This species, originally discovered on the Florida coast, was 

 found at Guadeloupe by M. Desbonne. 



Piltiannn^ inar^iiiattis, nov. sp. 



A very small species. Carapax somewhat hairy, moderately convex, 

 somewhat distinctly areolated, and regularly covered with small equi- 

 distant tubercles, between which the surface is very minutely punc- 

 tate. The posterior extremity is very narrow. The areolets are not 

 protuberant. The median frontal channel is rather deep and con- 

 spicuous. The front is broad, very little pi'omiuent, and separated 



