NCENIA UNDATA. 



477 



AMPHIPODA. 



NATAT0R1A. 



PODOCERIDES. 



NCENIA UNDATA. 



Specific character. Second pair of gnathopoda having the propodos with 

 the palm oblique, imperfectly defined, and slightly waved. 

 Length \ inch. 



Ncenia undata. Spence Bate, Cat. Amph. Brit. Mus. p. 272, pi. xlvi. fig. 5. 



The antennae are about half the length of the animal, 

 the flagellum not being longer than the last joint of the 

 peduncle. First pair of legs having the hand dilated, 

 slightly broader than the wrist, and tapering ; the palm 

 is oblique, occupying the entire under margin, and is 

 ciliated ; the finger is distinctly serrated. The second 

 pair of legs have the hands ovate, and the palm oblique, 

 and undulated (whence the specific name), defined by 

 two or three short spines, and flanked by two or three 

 short transverse rows of cilia. In other respects this 

 species differs little from the last. 



It was sent to us by Mr. Alder, who dredged it on the 

 coast of Northumberland. 



