120 S. T. Smith on American Crustacea. 



Desmarest's description is as follows : — " Carapace unie, avec le bord 

 anterieur sinueux ; serre droite ordinairement phis grande que la gauche ; 

 toutes les deux etant finement ehagrinees en dehors, avec une ligne en- 

 foncee courte, pres de leur extremite, et ayant leurs doigts longs, 

 etroits, tr^s-ecartes entre eux, unis, comprimes ; pedoncules oculaires 

 pourvus a leur extremite d'une pointe aigue. Des Antilles." 



G-elasimus princ.ps, sp- nov. 



Plate II, figure 10. Plate III, figure 3-3^. 



Male. The carapax is in the form of a trapezoid much contracted 

 behind, and the dorsal surface is smooth and shining. The branchial 

 regions are somewhat gibbous, are higher than the gastric and cardiac 

 regions and are separated from them by deep sulci. The fi'ont is 

 spatulate and much contracted between the bases of the ocular 

 peduncles. The su])erior margin of the orbit is strongly curved, the 

 jiosterior margin is slightly raised and minutely denticulated, and the 

 outer angle projects laterally as a very prominent triangular tooth, 

 which is considerably larger on the side of the greater cheliped than 

 on the other side, so that the carapax is somewhat un symmetrical. 

 The lateral margins are marked by sharply granular lines which 

 curve slightly inwai"d and rapidly converge posteriorly. The upper 

 portion of the inferior branchial region is quite oblique, flat and 

 smooth, and is separated from the lower portion by a slight, granu- 

 lated line. The inferior margin of the orbit is armed with about 

 twenty-five small, compressed and truncate teeth. 



The ocular peduncles are unequal in length, the one on the side of 

 the larger cheliped being the longer, very slender but considerably 

 enlarged at the the cornea and shorter than the broad, open orbits. 



The larger cheliped is enormously developed, the hand being nearly 

 three times as long as the carapax. The anterior surface of the merus 

 is flat and smooth, and its superior margin projects into a thin, high, 

 evenly arched and sharply dentate crest, and the inferior angle is 

 armed with a line of small and closely set spines. The upper surface 

 of the carpus is rounded and verrucose and the inner margin is angu- 

 lar and denticulate. The basal portion of the propodus is rounded 

 and coarsely verrucose externally, the superior margin projects as a 

 thin crest beneath which the carpus closes, the inferior margin is 

 dentate, and the inner surface is smooth, excepting two tuberculose 

 crests, of which one runs obliquely upward, from the base of the 

 dactylus, along the margin of tlie depression into which the carpus 

 folds and meets the first crest in a rigfht anirle. The fingrers are much 



