STALK-EYED CRUSTACEA 241 



The colour is yellow, with the front of the carapace 

 and the anterior legs red. 



Range. — West Indies, Hayti. 



4. Geocarcinus planatus. 



Geocarcinus planatiis . . . Stimpson. 



Body depressed, carpace broad, flattened about the 

 middle and posteriorly ; 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. Fourth joint of external maxillipedes 

 subquadrate, with a very deep notch on its antero-interior 

 margin. The first pair of legs small ; fifth joint armed 

 with small spines on the inner margin. Walking legs 

 of moderate length, very spinous towards their extremities ; 

 terminal joint with six rows of spines. 



Range. — Todos Santos, near Cape St. Lucas, Lower 

 California. 



5. Geocarcinus lagostoma. 



Geocarcinus lagostoma . . . H. Milne Edwards. 



Carapace is not so wide as that of G. niricola ; antero- 

 lateral borders with a pronounced ridge near the external 

 orbital angle. The regions are well marked, the gastric 

 region being broad. The margin of the branchial lobes 

 have a scaly appearance. The external maxillipedes have 

 their fourth joint more or less triangular, with the anterior 

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