ANOMOURA HIPPIDEA. 499 



the principal Sooloo island ; found swimming along the sandy bottom 

 in shallow waters. 



Length, one and one-eighth inches. Colour, whitish, or cream- 

 coloured. The eyes slightly project beyond the limits of the indenta- 

 tion, from beneath which they arise. The shorter flagellum of the first 

 antennae is ten-jointed, and the under side is furnished with hairs as 

 long as two or three of the joints. The longer flagellum has short 

 hairs about as long as the joints. The carapax has no transverse lines, 

 and only two faint depressions, less than a line long, forward of the 

 middle. In the two preceding species there are two transverse lines, 

 one near the front, and one anterior to the middle, reaching between 

 the same points as are here occupied by the faint depressions. 



The base of the first antennae was distinctly three-jointed; the 

 second joint very short; the third broad in profile view, and having 

 the upper side pubescent. 



HIPPA EMERITA (Linn), Fair. 



Plate 25, fig. 9 a, front, with eyes and antennse, enlarged six dia- 

 meters; b, third joint of outer maxilliped, enlarged two diameters; c, 

 last joint of anterior legs, enlarged six diameters. 



Rio Janeiro. 



This species is distinguished from the following by having a regu- 

 larly triangular median tooth to the front, acute or nearly so, and the 

 inner apex of the outer maxillipeds much prolonged, the elongation 

 being as long nearly as its breadth at base. The form of the terminal 

 joint of the anterior legs, appears to vary much, and affords no certain 

 distinction, except it may be the absence of a tooth on the anterior mar- 

 gin of the joint. 



Cancer emeritus, LINN. 



Hlppa emerita, FABR., Supp. Ent. Syst., 370 ; EDWARDS, Crust., ii. 209. and Cuv , 

 pi. 4'2, f. 2. 



HlPPA TALPOIDES (Say). 



Plate 25, fig. 10 dl, front, enlarged six diameters ; b, third joint of 



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