ISSO.J KATURAL SCIENCES OF PHILADELPHIA. 137 



cheliped with a prominent tooth below ; meros with a tooth on 

 posterior margin at the artieukition with the carpus, otherwise 

 smooth and rounded, its upper and lower margins with spiniform 

 teeth which are more prominent above ; carpus elongate, with in- 

 (iistinct tubercles. Hand very large, compressed, externally 

 tuberculate on the basal portion, above with several teeth like 

 those of meros, inferior margin proximaLy tuberculate, outer sur- 

 face of thumb with large shallow punctte, the lower portion being 

 marginate. Occludent margin with three rows of tubercles, the 

 middle one forming a prominence at the basal two-fifths, the other 

 rows undulating, extremity contorted, acute ; inner surface nearly 

 smooth, with a tubercular ridge running from the articulation of 

 dactylus to the middle of lower margin of the palm ; dactylus 

 lamellate, externally granulate, lower margin nearly straight, 

 upper margin arcuate, basally tuberculate, tip acute and nearly at 

 right angles with occludent margin, inner surface nearly smooth, 

 somewhat concave, with a longitudinal tuberculate ridge near the 

 occludent margin. 



Bahia, Brazil! Dr. Wilson. Natal! [f] Dr. Wilson (labeled G. 

 natalensis). South America ! (Phila. Acad.) West Coast of Nicara- 

 gua ! McNiel (Smith's types in Peab. Acad.). Cayenne (Latr. 

 Edw.), Brazil (Latr. White), West Indies (White,', Eio Janeiro 

 (Dana). 



The only differences between Smith's types and specimens 

 from other localities, are the more crowded spines on the 

 upper border of the meros and the more sparse tuberculation of 

 tiie basal portion of the hand, characters surely not of specifi^c 

 importance. 



2. Gelasimus heterccheles Kingsley. PI. ix, f. 2. 



Seba, Thesaurus, iii, pi. xviii, f. 8 (1758) ; Cancer vocans major 

 Herbst, Naturgesch. Krabben und Krebse, pi. i, f. 1 (after Seba) 

 (1790). Ocypoda heterocheles Bosc, Edit. I, "torn, ii, p. 197, 1802" 

 (teste Auct.) ; Edit. II, i, p. 250 (1828) ; Cancer iika Shaw, Natur- 

 alist's Miscellany. XIV, pi. 588 (after Seba).i Gelasimus maracouni 

 (pars) Desmarest, 1. c, p. 123 ( 1825). Gelasimus platydactylus Edw., 

 Hist. Nat. des Crust., ii, p. 51 (1837) ; Ann. Sci. Nat., Ill, xviii, p. 



' I have been unable to ascertain the date of this volujne. The first 

 volume of the series bears the date 1790, the twenty-fourth (and last) 

 1813, but no others are dated ; it would, however, seem probable that the 

 fourteenth volume appeared in 1803, while the ''.\n X," in which Bosc's 

 first edition appeared, embraced parts of 1802 and 1803. 

 10 



