CRUSTACEA. 



Plate 25, fig. 5 a, animal, enlarged three diameters ; 6, outer maxil- 

 lipeds. 



Sandwich Islands. 



Length of carapax, O3 inch ; breadth, 0'37 inch ; or ratio, nearly 

 as three to four. The eyes are unusually large for the family Leuco- 

 sidae. The front hardly projects as far forward as the epistome. The 

 frontal lobes are rather large and deeply separated. A faint depres- 

 sion proceeds along the back of the carapax, either side of the middle, 

 and passes either side of the posterior area. The tarsi are short 

 pubescent. Outer maxillipeds in part pubescent. 



FAMILY IV. DORIPPID.E. 



DORIPPUS SIMA, Edwards. 

 Singapore, East Indies. 

 Dorippus sima, EDWARDS, Crust., ii. 157. 



TRIBE II. CRUSTACEA EUBRANCHIATA ANOMOURA. 



THE relations of the Anomoura to the other Eubranchiata, have 

 been discussed on pages 49 to 58, and we give here only a recapitu- 

 lation of the grand divisions, with their subdivisions, making but a 

 few preliminary remarks. 



As the Anomoura constitute properly a transition group, between 

 the Brachyura on one side and the Macroura on the other, there may 

 be much doubt as to the proper limit in each direction. Ranina and 

 Dromia, with some allied genera, are separated from the rest by De 

 Haan, and placed with the Brachyura; while Galathea and Grimo- 



