138 PROCEEDINGS OF THE ACADEMY OF [1880. 



144, pi. iii, f. 2 (1852) ; Savissure, Revue et Magazin de Zoologie, II, 

 V, p. 362 (1853) ; Smith, Trans. Coun. Acad-., ii, p. 122 (1870). 

 Gelasimus princeps Smith, 1. c, p. 120, pi. ii, f. 10, pi. iii, f. 3-3e 

 '1870) ; Report Peab. Acad., iii, p. 91 (1871) ; Lockington, Proc. 

 California Acad., vii, p. 145 (1877). 



Carapax transversely iiearl}^ flat ; meros of larger cheliped 

 rounded posteriori}^, its lower margin crenulate, its upper pro- 

 duced into a broad, arcuate, laminiform, dentate crest ; carpus 

 elongate, externally tuberculate, inner margin crenulate, the inner 

 surface with one or two tubercles. Hand large, compressed, palmar 

 portion swollen, upper and lower margins tuberculate, external sur- 

 face of palm tuberculate, of thumb smooth, except a crenulated 

 ridge below. The inner surface smooth, with a tuberculate ridge 

 winning from the lower margin at the base of the thumb obliquely 

 upward and backward, and meeting a similar ridge from the base 

 of the dactjdus ; occludent margins of thumb with three rows of 

 tubercles, (the middle the most prominent) and somewhat angulated 

 beyond the middle. Dactylus with the upper margin and outer 

 basal portion tuberculate, the occludent margin rather prominent 

 in the middle. 



Mexico! (Guerin-Meneville). Jamaica! (Dr. Wilson) Phila. Acad. 

 Cayenne, Edw. W. Coast Nicaragua ! (McNiel, Smith's types 

 Peab, Acad.). Lower California (Lockington). Mazatla.n (Saus- 

 sure), 



Seba's figure represents the carapax as granulate and the front 

 rather broad (in these respects he has been followed by Herbst 

 and Shaw), otherwise his figure answers well. Bosc says that the 

 species is black ! Smith's types agree well with the Jamaica, 

 specimens which I have seen, except that the meral crest in the 

 Nicaraguan specimens is more distinctl}' den.tate. 



3. Gelasimus bellator White. PI. ix, f. ?i. 



Petiver, Opera, i, PI. 78, f. 5 (1767) ; Gelasimus bellator White, Cata- 

 logue British Musenm Crustacea, p. 36 (1847) ; (sine descr. ) Voyage 

 of H. M. S. Samarang, Crustacea, p. 49 (1848) ; Edw., Ann. Sci. 

 Nat., Ill, xviii, p. 146 (1852). 



Carapax arcuate, front but little enlarged below tlie eyes. 

 Meros of larger cheliped posteriorly with an oblique rounded 

 ridge, its ijiipper and lower margins crenulate, the former even 

 denticulate ; carpus externally polished, above granulate, inner 

 margin denticulate, outside of palm and basal portion of dactylus 

 granulate., inside of palm granulate but without tubercular ridges 



