212 AEÏ. II. — A. IZUKA : 



Family Nephthydidae. 



Prostominm flattened, generally quadrangular, rarely nearly 

 hexagonal ; a short tentacle at each anterior angle, and one 

 palpus in a little more posterior and ventro- lateral position, or the 

 both may be absent. Eyes two, or none. Body elongate, al- 

 most tetragonal in section, though convex dor sally and flattened 

 ventrally. Segments similar. Anus terminal with a single cirrus 

 (rarely two, Ehlees) beneath. Peristomial segment fused with 

 the segment behind. Proboscis large, sub -cylindrical, ovate or 

 obovate, with or without bifid papillae, with or without a pair of 

 horny teeth. Two rami of parapodium widely separated, flattened, 

 each bearing an acicula and a double row of bristles ; the dorsal 

 ramus having superiorly a lamella and other processes as well 

 as a small dorsal cirrus in connection with branchia ; the ventral 

 ramus has a lamella and a ventral cirrus, with or without other 

 processes. 



Genus J^ephthys Cuvier. 



Prostomium as in the family ; both tentacles present. Earely 

 with a pair of eyes. Proboscis made up of two parts ; in extrusion 

 with 22 rows of distal papillso, a double arch of bifid papillae 

 round the aperture, and a pair of liorny teeth internally. Body 

 as in the family. Parapodium with dorsal and ventral cirri which 

 are either conical or foliaceous. Lamell£e generally well developed. 

 Bristles of two kinds : barred bristles placed anteriorly in each 

 ramus; and longer serrated bristles with flattened, though nar- 

 row, terminal blade, placed posteriorly in each ramus. 



