294 CRUSTACEA. 



GENUS TKICHODACTYLUS. 

 TRICHODACTYLUS PUNCTATUS (?), Eydvux and Souleyet. 



T. quadrate affinis. Punctatus. Margo carapacis antero-lateralis mi- 

 nut biremarginatm, nan reflexus. Frons leviter excavatus. Digiti 

 plerumque brevissime tomentosi, eoque tarsis similes. Articulus maxil- 

 lipedis externi Btius 2do vix brevior. 



Near T. quadratus. Punctate. Antero-lateral margin of carapax 

 minutely bi-emarginate, not reflexed. Front slightly excavate. 

 Fingers mostly toinentose like the tarsi. Third joint of outer max- 

 illipeds but little shorter than second, 



Rio Janeiro. 



Length of carapax, thirteen lines; greatest breadth, fifteen lines; 

 ratio of length to breadth, 1 : 1'15. This species may be the quad- 

 ratus; but that species, according to the figure in Edwards's Cuvier, 

 Plate 15, represents the margin entire. The punctate character is 

 a peculiarity also of the quadratus. 



III. CYCLINEA. 



Pedes postici nan natatorii. Antennae externce obsoletce. Ramus maxil- 

 lipedis \mi internus simplex. Carapax angustus vel suborUcularis. 



Not natatory. Outer antennae obsolete. Inner branch of first maxil- 

 lipeds simple. Carapa-x narrow or suborbicular. 



The singular species here included, has much the appearance of 

 an Atelecyclus, and its relation to that group is suggested by Lucas. 



