122 S. J. Smith oti American Crustacea. 



granules. The jngal regions are granulous. The chelii)eds resemble 

 very much the smaller cheliped of the males but are rather smaller 

 in proportion. The abdomen is broadly elliptical and there is a line 

 of granules on the basal segment. 



Two of these specimens give the following measurements : 



Under the name of G. platydactylus, Saussure* mentions a species 

 from iVIazatlan, Gulf of California, which I sliould refer to this species 

 without hesitation, did he not state that the carpus was bitubereulate, 

 a character which does not apply to any species of Gelaslmus which 

 I have seen. Saussure's notice is as follows : 



" Gelaslmus 2olatydactijlus^ Latr. — Presque entierement semblable 

 aux individus de Cayenne, si ce n'est que le carpe est bitubercule, et 

 que la grande Crete du bras est dentelee, non entiere." 



G-elasimus platydactylus Edwards. 



f Cancer vocans major Herbst, Naturgeschichte der Krabben und Krebse, Band i, 



p. 83, Band iii, erstes Heft, p. 29, Tab. 1, tig. 1 1 (after Seba). 

 ? Ocypoda heterochelos Bosc, Histoire naturelle des Crustaces, tome ii, p. 197, 1802. 

 ? Gelasimus maracoani Desmarest, Considerations gonerales sur la Class des Crnstaces, 



p. 123, 1825, (non Latreille). 

 Gelisimus phUydctylus Edwards, Histoire naturelle des Crust., tome ii, p. 51, 1837 ; 



Annales des Sciences naturelle, 3^^ serie, Zoologie, tome xviii, 1852, p. 144, pi. 3, 



fig. •-'. 



The synonymy of this species is in much confusion. Edwards 

 quotes Ilerbst's and Seba's figui-es without query as belonging to his 

 G. platydactylus and refers the Ocypoda heterochelos of Bosc to the 

 G. viaracoaiii. Bosc's description however appears to have been 

 drawn up from Herbst's or Seba's figure, and if these figui'es really 

 belong to Edwards' species, the name heterochelos should be restored 

 and the species should stand as Gelasimus heterochelos. The rough- 

 ened or veiTucose character of the carapax in Ilerbst's figure is a 

 marked feature which is not mentioned in either of Edwards' descrip- 

 tions, so that it is quite likely that Bosc's heterochelos may be distinct 

 from Edwards' species. Edwards gives Cayenne as the habitat of 

 G. platydactylus. 



As described and figured by Edwards, this species difiers from 

 G. princeps in having the superior crest of the merus of the larger 



* Description de quelques Crustaces nouveaux de la cote occidentale du Mexique. 

 Eevue et Magasin de Zoologie, 2^ serie, tome v, 1853, p. 362. 



