IONE, 251 
ISOPODA. - BOPYRIDZ. 
NORMALIA. 
Genus—IONE. (Latreille.) 
Turis genus is at once distinguished from all the other 
Bopyride, except Argeia of Dana, by the possession of 
elongated branchial (?) appendages attached to the base 
of the six anterior pairs of legs in the female, and by the 
structure of the branchiez affixed at the sides of the tail 
in both sexes; all of these in the male, and the posterior 
pair in the female, are elongated and filiform, whilst the 
pairs attached to the five anterior segments of the tail 
in the female are greatly elongated and multi-ramose, 
resembling pieces of coral. 
The male is minute, resembling those of the Bopyri, with 
the head distinct, the outer antenne prominently project- 
ing beyond the front margin of the head, the inner pair 
rudimentary, the seven segments of the body of nearly 
equal size and width (except the first, which is shorter 
than the rest); they are separated from each other by a 
considerable space, having the lateral margins somewhat 
angularly produced, the legs being affixed beneath the 
lateral angles. The legs resemble those of the male 
Bopyri, and are terminated by a small oval hand, with a 
small curved finger. The tail is narrower than the hinder 
segments of the body, and consists of six distinct seg- 
ments, gradually narrowing in size, each segment being 
furnished with a pair of elongated slender, cylindrical, 
membranous appendages (pleopoda). 
The female is much larger than the male, with the 
body flattened, pear-shaped, and slightly unsymmetrical. 
The head is transverse in front, its posterior portion being 
