1880.] NATURAL SCIENCES OF PIIILABELPHIA. 141 



There is a considerable confusion regarding this species. p]d- 

 wards considers this as the (Jancer vocans of Linne. Linne in 

 his tenth edition .p. (i2 >, 175Y) quotes Rumphius, PI. XIV, f. E. ; 

 and Catesby's Carolina, ii, PI. XXV. Rumphius' figure (of a 

 specimen from Amboina) represents a form with the fingers regu- 

 larly tapering, and resembling G. tetragonon more nearly than any 

 other species with which I am acquainted, but the figure is not 

 accurate enough to have an}^ systematic value. Catesby's figure 

 is the well-known Ocypoda arenai-ia of North America. Linne 

 (in the Amoenitates Academici, vi, p. 416) gives a description, 

 which does not at all apply to this species, and quotes in addition 

 Marcgrave, Piso, Rumphius, Catesby, and Seba, in the order 

 given, showing a still greater confusion. In his 12th edition, p- 

 1041, Gronovius and Petiver are added to the list, but no hints 

 showing what should be regarded as the Cancer vocanii. As there 

 exists such confusion, it is impossible to apply the name vocana, 

 with certainty, to an}' species, and for that reason I have thought. 

 it best to allow it to lapse into sj'nonymy and take the first recog- 

 nis ible description for this species. 



8. Gelasimas marionis Desmarest. PI. ix, f. 8. 



Oelasimus marionis Desm., Consid. sur le Crust., p. 124, PI. XIII, f. 

 1 (1825) ; Edw., Ann. Sci. Nat., Ill, xviii, p. 145 (1852). 



Carapax smooth, and with each margin terminated by an acute 

 angle directed forward; an H -shaped impression on the carapax. 

 Ocular peduncles slightly enlarged at the extremity, and without 

 a terminal point. Inferior border of the orbit creuulate. Right 

 hand greatly larger than the left, greatly' compressed, basallv 

 granulate; finger straight, its sides smooth, its occludent margin 

 granulate ; thumb arcuate below, with its internal border broadly 

 excavate in the middle, and armed with fine teeth. Length, 8 

 lines ; breadth, one inch (Desmarest). 



Manilla (Desm.^. Malabar {'Edw.''. 



I have not seen any form corresponding to this description or 

 figure. 



S. Gelasimus dubius Stimpson. 



Gelasimux dubius Stra., Proc. Acad. Nat. Sci., Phlla., 1858, p. 99. 

 Carapax and front as in G. cultrimanus. Inferior margin of 

 orbit crenulate, externally angulate. Meros of larger cheliped 

 spinulose, hand stout, externally granulate or tuberculate ; in- 



