206 Zoological Society. 



of lower orbit very distinctly crenated ; carapace with the upper 

 surface smooth ; the lateral edges rounded, without any sharp keel 

 from the outer orbital angle. Larger hand with the fingers wide, 

 both at the end slightly curved outwards, the lower finger with a 

 very wide sinus in the middle ; near the end a wide lobe serrato- 

 crenated on the edge ; moveable finger with the lower edge nearly 

 quite straight. 



Hab. Philippine Islands. From Mr. Cuming's collection. 



Gelasimus porcellanus, White, 1. c. p. 36. 



Eye-pedicels very long ; the frontal portion of carapace not nar- 

 rowed at base ; the hind part of carapace much longer than the 

 side. Lower finger thickened at the end, the inner margins of both 

 fingers with four larger tubercles amongst the small crenules. 



Hab. Borneo. Presented by the Lords of the Admiralty. 



Family Maiad*e. 

 Tyche, Bell. 



TfCHE EMARG1NATA, White, 1. C. p. 10. 



Carapace with the dilated part behind, deeply notched in the mid- 

 dle ; the tubercles on the sides of the depressed part with hairs. 



The genus Tyche was established by Professor Bell in the Zoolo- 

 gical Transactions for a species from Panama, which he has described 

 and figured under the name of T. lamellifrons. The specimen from 

 which the above brief description is taken is very much mutilated, 

 but is clearly distinct from Mr. Bell's. 



Hab. West Indies. British Museum. 



Family Thelphusid^:. 

 Valdivia, n. g. 



Outer jaw-feet with second joint wider than long; third joint 

 longer than wide, slightly notched at the end. Carapace depressed, 

 rather more rounded in the outline than in Thelphusa ; the latero- 

 anterior edge with four sharp teeth directed forwards ; legs very long, 

 last joint very long, smooth. 



This genus is closely allied to Trichodactylus. 



Valdivia serrata, White, 1. c. p. 31. 



Front quite straight ; a strong distinct keel from last tooth on side 

 of carapace to hind part ; the whole upper surface of carapace and 

 legs is covered with a brownish epidermis. 



Hab. ? British Museum. 



Family GrapsiduE. 

 Utica, White, n. g. 



Carapace somewhat eight-angled, tabular, the latero-auterior mar- 

 gin with three teeth ; the latero-posterior part of the carapace ob- 

 lique ; carapace behind very straight ; behind the middle there is a 



