STALK-EYED CRUSTACEA 



195 



II. Antcro-lateral teeth alternately large and small . 



Cronius . . . 

 Portuuiis (partj) 

 Lupea (part) 

 AcJielous (part) 



4. Cronius. 



Stimpson, A. Milne Edwards. 



Lamarck. 



H. Milne Edwards. 



A. Milne Edwards. 



The front, wide, is divided into eight teeth, counting 

 the internal orbital angle. The antero-lateral borders are 

 cut into nine alternately large and small teeth. The basal 

 antennal joint is advanced in such a way as to exclude the 

 flagellum from the orbit. The fourth joint of the external 

 maxillipedes is slightly prolonged in front, but is dilated 

 externally ; the terminal joints are cylindrical. The 

 fourth joint of the last pair of legs has a spine. 



Range. — West Indian Sea and Gulf of Mexico, Cape 

 Verde, Pacific Ocean. 



I. Cronius ruber. 



Cronms ruber . . Lamarck, Miers, Stimpson, A. 



Milne Edwards. 

 Portuniis ruber . . Lamarck. 

 Lupea ruber . . . H. Milne Edwards. 

 Achelous ruber . . A. Milne Edwards. 



The carapace is hexagonal, smooth, and slightly hairy. 

 The front has the two median teeth advanced, large, and 

 directed forwards ; those of the second pair, sharp, directed 

 slightly outward, and are separated from those of the third 

 pair by a deep notch ; these are sharp, directed forwards, 

 and slightly separated from the fourth pair, which 

 constitute the internal orbital angles, and are rounded in 



