STALK-EYED CRUSTACEA 243 



I. Gecarcoidea lalandii. 



Gecarcoidea lalandii 



■J 



. . H. Milne Edwards. 

 Pelocarcinus lalandii 



Carapace oval, and without crest upon the lateral 

 borders. 



The first pair of legs strong; pincers large, cylindrical, 

 tuberculous ; the fingers are in contact through their 

 whole length when closed ; anterior border of the fourth 

 joint nodulous. The walking legs are toothed on their 

 edges ; those of the third pair are the longest. The last, 

 terminal, joint has six rows of spines. The colour is a 

 red-brown. 



Range. — Brazil. 



3. Cardiosoma. 



Cardiosoina . . Latreille, H. Milne Edwards, Miers, 



S. J. Smith. 

 Cancer .... Linne. 

 Ocypoda . . . Latreille. 

 Gecarcinus . . Latreille, Desmarest. 



Carapace transverse, elevated, and sometimes very- 

 convex anteriorly ; with the branchial regions antero- 

 laterally convex, and very greatly developed. The antero- 

 lateral margins are sometimes armed with a small tooth 

 placed at a short distance from that at the external angle 

 of the orbit. Front deflexed, and usually broader than 

 Geocarcifius ; it nearly reaches the anterior margin of the 

 buccal cavity, and conceals, in part, the antennules. 

 Orbits large and widely open, with the margins entire ; 

 the interior subocular lobe is separated by a wide hiatus 

 from the frontal margin, and this hiatus is occupied by 



