144 S. I. Stnith on Amerlcmi Crustacea. 



Africa, with which it is compared on page 16 of this volume. In the 

 African species the first pair of these appendages are very much like 

 those of the following species, the horny tips being long, slender and 

 somewhat spiral, and the process on the iipper edge extending much 

 beyond the thickened portion of the organ. 



Cardiosoma crassum, sp nov. 



Plate V, figure 5. 



In general appearance this species is closely allied to C. qiiadratum. 

 The carina of the lateral margin of the carapax is, however, much 

 more strongly mai'ked and the ambulatory legs are clothed with long 

 hair, while in G. quaclratum they are nearly naked. The male abdom- 

 inal ai:)pendages are entirely unlike in the two species. 



The dorsal surface of the carapax is naked, very minutely granu- 

 lous, regularly and strongly convex longitudinally, but only slightly 

 transversely, and the areolation is not strongly marked, the cardiac 

 region and the median portion of the gastric alone being indicated ; 

 the anterior extremity of the mesogastric lobe, however, is distinct, 

 long and slender and reaches nearly to the front. The front is broad 

 and high and the epigastric lobes protuberant, leaving, between them 

 and the front, a depressed space which is thickly covered with coarse 

 granules. The superior margin of the orbit is slightly sinuous, as seen 

 from above, and the lateral angle projects forward as an angular tooth. 

 Just back of this tooth the antero-lateral margin is broken by a sharp 

 notch, above which the carina of the lateral margin begins in a sharp 

 prominence. This carina through its entire length is very high and 

 distinct, being much more strongly marked than in C. quadratum. 

 The epistome and nasal lobe are very much as in C. quadratum, but 

 the labial border of the epistome is armed with a line of granules 

 which is more sharply raised and composed'of smaller granules than 

 in that species. The jugal regions are densely clothed with short, soft 

 hair. The inferior branchial regions are naked, but are roughened 

 with numerous, short, sharp rugte. 



The chelipeds are very unequal in both sexes, and the ischial seg- 

 ments are armed, on the anterior side, with a few small tubercles. In 

 the larger cheliped, the merus is triquetral, very stout and reaches 

 slightly beyond the lateral margin of the carapax, the anterior sur- 

 face is flat and both its margins are armed with very large and prom- 

 inent tubercles directed forward, and on the outer surface and the pos- 

 terior angle, which is obtuse, there are short granulous rugre which 

 are very conspicuous on the angle. The larger hand is very short and 



