234 Notes on North American Crustacea. 



Gecarcinus planatus, nov. sp. 



Body depressed ; carapax broad, flattened about tlie middle and pos- 

 teriorly ; median and lateral furrows of gastric region well-marked, the 

 median one deep ; longitudinal furrows of branchial region near gastric, 

 obsolete ; transverse cardiac furrow deep ; no furrow separating genital 

 region from the gastric. Hepatic, and anterior part of gastric regions 

 granulated. Frontal margin thin and denticulated ; not dilated within 

 to the antennulary fossae. Meros-joint of outer maxillipeds subqua- 

 drate, with a very deep notch on its antero-interior margin, Chelipeds 

 rather small; carpus armed with small spines on the inner margin. 

 Ambulatory feet of moderate length, very spinous toward their extremi- 

 ties ; dactylus with six rows of spines. Length of c^'apax in a male, 

 1.37; breadth, 1.80 inch. 



Found at Todos Santos, near Cape St. Lucas, Lower Califor- 

 nia, by Mr. John Xantus. 



Epilotoocera,* nov. gen. 



Potamocarcino carapacem frontemque similis. Lobus suborbitalis inter- 

 nus fronti junctus, antennam externam tegens, sed non cam orbita 

 excludens. Antennae pars mobilis parvus, in orbitae cantho interno situs. 

 Maxillipedum externorum merus transversus, margine antico rotundatus ; 

 palpus goniarthroideus. 



Tbongli closely allied to Potamocarcinus, this genus is very- 

 peculiar in the position of its external antenna, which passes 

 behind the internal suborbital lobe and enters the orbit, the 

 moveable part appearing in the interior corner of that cavity. 



Epilobocera ciibensi§, nov. sp. 



Carapax flattened, glabrous ; dorsal surface minutely granulated, with 

 two minute lunate sutures or impressed lines at the middle; antero- 



* 'Em, super ; Xofioi, lobus : Ktpas, corau. 



