144 PROCEEDINGS OF THE ACADEMY OF [1880. 



(Phila. Acad); Tahiti and Sandwich Is..' A. Garrett (Peab. 

 Acad.); Red Sea and Nicoiar Is. (Heller); Zanzibar (HilgCn- 

 dorf, ; Bourbon (Edwards) ; New Caledonia {A. Milne-Edwards). 



13. Gelasimus acutns Sfm. 



Gelashnus acutus Stm., Proc. Phila. Acad., 1858, p. 99. 



Carapax narrowed behind, anterolateral angles prominent, acute, 

 marginal line distinct. P'ront narrow, not constricted, inferior 

 margin of orbit crenulate, externally acute, internal suborbital 

 lobe convex ; a crest on the sub-hepatic region parallel to the in- 

 ferior margin of the orbit, the included surface smooth. Larger 

 hand coarsely granulate, a tubercular ridge on the inner surface. 

 Fingers not longer than the palm, externally sulcate, inner margin 

 dentate, median tooth larger, but no sub-terminal tooth (Stimpson). 



Macao (Stimpson). 



14. Gelasimus forceps Milne-Edwards. PI. ix, f. 12. 



Oelasimus forceps Edw., Hist. Nat. des Cmst., ii, p. 52 (1837) ; An- 

 nales des Sciences Naturelles, III serie, tome xviii, p. 148, PI. Ill, f. 

 11 (1852) ; White Cat. Brit. Mus. Crust., p. 36 (1847). 



Cavapax narrowed behind, lateral angles prominent, acute; 



orbits below with two denticulate margins. Meros and carpus 



smooth, the lower margin of the meros crenulate, upper cristate, 



finely dentate ; hand smooth or indistinctly granulate, fingers 



long, slender, finely denticulate, the thumb with a distal lobe 



(Edwards). 



Australia (Edwards, White). 



I have not forms referable to the two foregoing species. 



15. Gelasimus longidigitum (nov.). PI. ix, f. 13. 



Closely allied to forceps in shape of carapax, orbits below with 

 a simple smooth margin. Meros and carpus smooth, the inner 

 margin of the carpus acute, crenulate. Basal portion of the hand 

 externally obscurely granulate ; internally with an oblique tuber- 

 cular ridge, and a few tubercles near the base of the fingers. 

 Fingers compressed, long, finely denticulate, and narrower near 

 the base than at the middle point. 



Moreton Bay, Australia ! E. Wilson. 



16. Gelasimus smitMi (nov.). PI. ix, f. 14. 



Carapax gibbous, front narrow ; meros with a strong, oblique 

 ridge on the upper outer surface, the inner upper mnrgin produced 

 into a prominent vertical crest. Carpus externally nearlj' smooth. 



