96 STALK-EYED CRUSTACEA 



the inside in adults ; the arm has many tubercles. The 

 walking legs are very long, slightly spinous, and hairy 

 only on their last joints ; terminal joint long and curved. 



The colour is yellow, with a large brown spot which 

 covers a great part of the cardiac region. The legs and 

 pincers are spotted with brown and white, the brown 

 sometimes forming a ring on the hand. 



Range. — Guadaloupe, St. Thomas, Florida, Mexico. 



13. Mithrax (Mithrax) forceps. 



MitJirax forceps . . Miers. 



MitJiracul us forceps . A. Milne Edwards. 



The carapace is slightly curved, subtriangular, with 

 the surface scarcely uneven ; there are some tubercular 

 elevations upon the border of the branchial regions. The 

 antero - lateral edges are armed with four pointed teeth, 

 simple and directed forwards ; behind the last there is a 

 small pointed tubercle. The front is wide. The prae- 

 ocular angle is a little advanced ; the superior orbital 

 border is scarcely interrupted by two small fissures ; the 

 external orbital angle is sharp, and there is a small spine 

 upon the inferior orbital border. The horns of the rostrum 

 are small, flat, obtuse, almost side by side. The basal 

 joint of external antennae is flat ; the antero - external 

 angle is advanced and forms a point ; there is a second 

 very small spine below the insertion of the flagellum. 

 The fourth joint of the external maxillipedes is very 

 dilated outwards, and is not notched in the antero-internal 

 angle for the insertion of the fifth joint. The first pair of 

 legs of the male is little developed ; the hand is frail, 

 smooth, and terminates in fingers relatively very large and 

 very wide at the end ; one large tooth in centre of cutting 

 edge of each. The forearm has inside one or two small 



