OF PLYMOUTH AND THE ENGLISH CHANNEL. 231 



*L. EXTENUATA, Grubc. Size 1^ inches. 

 Prostomium somewhat deeply cleft. 



Elytra, most of the surface minutely and densely spinulose. 

 External margin richly provided with long pellucid cilia. 

 *L. EARISPINA, Mahngrcn. Size 1| inches. 



Closely resembling L. Jioccosa. Spines on elytra larger. 

 Two curved chsetee arise dorsally from the base of the tentacular 

 cirri. 



Genus SCALISETOSUS, Mcintosh. 



Anterior border of the head smoothly rounded. 



Eyes placed close together on each side, while the right and left 



pairs are widely separated and placed far back. 

 Palpi smooth. Proboscis somewhat thin. 

 Body of moderate length. Scales cover the dorsum in front, but 



leave the centre bare posteriorly. 

 Segmental eminence distinct, but papillse small. 

 Chsetse transparent as crystal; dorsal slightly curved, and with 



from five to eight very distinct rows of spines. Ventral 



bristles slender, elongate, with close spinous rows, and hooked 



and bifid tip. 

 f S. COMMUNIS, Delle Chiaje. Size | inch. 



Median and lateral tentacles long, with numerous short clavate cilia. 

 *S. ASSIMILIS, Mcintosh. Size f inch. 



Median tentacle long, lateral short ; all smooth. 

 A blackish brown median band down the back. 

 ■fS. ECHINI, Giard. Size l\ inch. 



Eesembling >S'. assimilis. An irregular band of green down the 



back. 



Genus POLYNOE, Savigny. 



Head elongated antero-posteriorly, with a somewhat indistinct 



peak on each side, beneath which is the lateral tentacle. 

 Anterior and posterior eyes widely separated. 

 Palpi, with dense rows of clavate papillae. 

 Body linear elongate, with many segments. 

 Segmental papillae long. 

 Elytra, fifteen pairs, with a broad belt of papillie on the surface 



anteriorly. 

 Notopodium minute, with small spinous chietae truncated at the tip. 

 Neuropodium has a single, strong, hastate chteta superiorly, and 



below, strong bifid chretffi with short spinous regions. 

 *PoLYNOE scolopendrina, Savigny. Size to 5 inches. 



NEW SERIES.— VOL. VI. KO. 2. R 



