128 K I. Smith on A?nerican Crustacea. 



lowing brief terms : — " Crete sourciliere posterieure presque droite, 

 I'anterieure tres courbe ; cretes marginales tres marguees sur les lobes 

 mesobranchiaux. — Antilles." 



It is quite apparent that Edwards confounded at least two species 

 under the name of palustris. The figure of G. vocans, which he has 

 given in the Regne animal and which he refers to his pahtstris, evi- 

 dently represents a different and distinct species, as the front is quite 

 narrow, the basal portion of the propodus of the larger cheliped 

 much longer in proportion and the terminal segment of the male ab- 

 domen entirely diifereut in form. It is very likely the same as the G. 

 vocafis of his Histoire naturelle des Crustaces, which is said to inhabit 

 Brazil. 



Stimpson, in tlie Annales of the Lyceum of Natural History, New 

 York, vol. vii, p. G2, refers the G. vocans of Dana and the G. minax 

 of LeConte to the palustris of Edwards, and he evidently had more 

 than one species before him, as he mentions tliat the tubercles on the 

 outer surface of the larger cheliped were minute or obsolete in speci- 

 mens from the Mexican and Central Amei'ican shores. 



G-elasimUS macrodactylus Edwards et Lucas. 



Voyage de d'Orbignj' dans FAmeriqiie meridionale, Crust, p. 27, pi. 11, fig 3, 184.3; 

 Edwards, Annales des Sciences naturelles, ^^^ serie, Zool., tome xviii, 1852, p. 149. 



" Cotes du Valparaiso " (Edwards and Lucas). 

 G-elasimus minax LeConte. 



Gelasimus minax John LeConte, On a new species of Gelasimus, Proceedings Acad- 

 emy Nat. Sci., Philadelphia, vol. vii, 1855, p. 403. 



Gelasimus palustris {pars) Stimpson, Annals Lyceum Nat. Hist., New York, vol. vii, 

 p. 62, 1859. 



Plate II, figure 4. Plate IV, figure l-l^ 



Male. The carapax is quite convex longitudinally and slightly 

 transversely, and in large specimens the branchial regions are some- 

 what gibbous above. The dorsal surface appears smooth, but is very 

 minutely granulous, and there are a few small tubercles on the ante- 

 rior part of the gastric region near the lateral margin. The front is 

 broad and regularly arcuate. The posterior, or upper, edge of the 

 superior orbital border is transverse and nearly straight, and has a 

 smooth upturned margin. The anterior, or lower, edge is marked by 

 a sharply raised and minutely denticulated margin which curves rap- 

 idly downward above the base of the ocular peduncle, then gradu- 

 ally upward and joins the posterior margin a little way from the an- 



