60 ATTSTBALIAH - MALACOSTBACA. 



Genus Leptodius, A. M.-Edw. 

 Carapace more or less transverse, anteriorly areolate, poster- 

 iorly plane or imperfectly divided; lateral gastric lobes not 

 sub-divided. Antero-lateral borders longer than the postero- 

 lateral, toothed or lobed. Front small, truncate. Basal joint of 

 the antennae short and thick, in contact with a process of the 

 front; flagellum lodged in the internal orbital hiatus. Third 

 joint of the external maxillipedes sub-rectangular. Anterior 

 legs unarmed. Posterior legs not spinulous. 



99. Leptodius exaratus. A.M. 

 Chlorodius exaratus, M.-Edw., Hist. Nat. Crust., t. L, p. 402, 



and Begne Animale de Cuvier, Crust., Atlas, pi. xi., fig. 3 ; Dana, 

 U.S. Explor. Exped., Crust., Vol. i., p. 207, pi. x., fig. 11 ; 

 Stimpson, Prodr., etc., (Proc. Acad. Nat. Sci. Philad.) 1858, 

 p. 31. 



Xantho qffinis, De Haan, Eauna Japonica, p. 48, pi. xiii., fig. 8. 



Leptodius exaratus, A. M.-Edw., Nouv. Arch, du Mus., t. ix., 

 p. 222. 



Carapace very broad, depressed, slightly lobulated in front. 

 Branchial region with three prominent lobes which follow the 

 contour of the carapace. Antero-lateral borders with four 

 triangular, broad and pointed teeth (not including the external 

 orbital angle). Posterior part of the carapace depressed and 

 completely smooth. Eront truncate, narrow, formed of two 

 lobes which are more prominent than the internal orbital angles. 

 Anterior legs robust, fingers long and black ; hand sometimes a 

 little rugose above, completely smooth on its other aspects. 

 "Wrist with an obtuse tooth internally. Ambulatory legs smooth. 



A widely distributed species. 



100. Leptodius sanguineus. 



Chlorodius sanguineus, M.-Edw., Hist. Nat. Crust., t. i., p. 402; 

 Dana, U.S. Explor. Exped., Crust., i., p. 207, pi. xi., fig. 11. 



Ghlorodius Edwardsii, Heller, Synopsis der Crust, des Eothen 

 Meeres, p. 8. 



Allied to the preceding, but with the carapace in general more 

 convex, without tubercles, and with five teeth on the antero- 

 lateral borders, the fifth being smaller than the rest. 



Perhaps only a variety of the preceding. 



