574 • Monograph of the 



Its size is about that of ornatus. Found at Key West, 

 Florida, J. E. Mills ; at the Tortugas, J. E. Mills ; at the 

 Bahama Is., Dr. Bryant ; and at Hayti, Dr. Weinland. 



CALLIXECTES TUMIDUS, nov. sp. 



Carapax quite convex, broad, and roughly granulated, with 

 the areolations quite distinctly marked. Antero-lateral bor- 

 der much more arcuated than in any of the preceding spe- 

 cies, and provided with very broad and large teeth curving 

 slightly forwards, with convex sides. Posterior tooth very 

 slightly prolonged, differing in this respect from any other 

 species of the genus that we now know. Front armed 

 with four obtuse, sub-equal teeth. Interior angle of the 

 lower margin of the orbit developed into a rounded and 

 somewhat prominent tooth. Sternum flat ; in the only 

 adult male specimen that I have, it is even slightly con- 

 cave. Abdomen of the male slightly broader than in orna- 

 tus and larvatus, penultimate segment quite short, and 

 with a slightly concave lateral outline. The intromittent 

 organs reach to the middle of the penult segment of the 

 abdomen, are curved, and very distinctly hooked at their 

 ends. 



The chelipeds are quite stout, and the granulations on 

 the costae of the manus very coarse. The carpus has roughly 

 granulated ridges, as in the preceding species, but in none 

 of my specimens is it armed with any spines, only faint 

 traces of them being visible ; but on its interior border we 

 observe two little prominences, one at the internal angle, 

 the other just below it, Meros armed with three spines 

 on the anterior border, but only faint traces of one at the 

 external angle. 



I have examined only a few specimens of this species, 

 but fully sufficient to show that it is distinct from any 

 other. The convex carapax, with its semicircular antero- 

 lateral border, short posterior tooth, and the hooked intro- 



