of plymouth and the english channel. 221 



Genus Eurythoe. 



Prostomium large. A caruncle, four eyes, dorsal. A median and 



two lateral tentacles. 

 Branchiae from the third segment backward. 



Sub-Family II. EUPHKOSYNINA. 



Body oblong or ovate oblong. A median tentacle, a trilobed 

 caruncle. 



Genus Spinther. 



Prostomium merged into general contour of body. Eyes four, at 



base of tentacle. 

 No branchite. 



Genus Euphrosyne. 



Prostomium narrow. Eyes four, two dorsal and two ventral. 

 Notopodium merged into the dorsum and provided with several 

 arborescent branchiie, and two or three dorsal cirri on each side. 



Genus EUEYTHOE, Kinherg. 



Body elongated, with flattened rectangular segments. 



Prostomium large, rounded or pentagonal. Eyes four, dorsal. 

 A median and two lateral tentacles. Caruncle trilobed. 



Palpi forming two adnate lobes inferiorly in front of the mouth, 

 each with a tentacular process or stylode. 



Dorsal cirrus single. Chffitaj of the notopodium linear, sub- 

 articulate ; others sub-bifid, with a serrate limb and a short 

 process. Neuropodial chtette bifid. 



Branchise from the third segment backward. 



f Eurythoe borealis, Sars. 



Genus EUPHEOSYNE, Savigmj. 



Body generally short, oblong, equally narrowed at either end. 

 Segments not numerous, two thick styles posteriorly. 



Prostomium narrow, frontal part narrowest, a band passing down- 

 ward to the inferior ridge. Eyes both on the dorsal and ventral 

 surfaces. One median tentacle situated in front of eyes. 

 Lateral tentacles two, very short, springing in front of the 

 inferior eyes. 



Fascicles of chtetae arranged on each side of the segments. Noto- 

 podial chsetse forming a transverse row, no barbs, Neuropodial 

 chtetffi grouped in a broad pencil. Capillary chaitse unequally 

 bifurcate. Dorsal cirri two (or three, Ehlers) on each side, one 

 at the inner border of the fascicle, the other at the outer margin. 

 Ventral cirri single. 



