NEW SPECIES OF EUPHROSYNE TREADWELL 



171 



tentacle is about one-fourth as long as the caruncle. It is of uniform 

 width throughout, lacking the slender terminal portion of E. horealis 

 (fig. 46, c). The two pairs of eyes are situated as in horealis^ and 

 near the ventral pair are two slender tentacles. From a dorsal view 

 only the tips of these tentacles are visible. 



On the dorsal surface a clear space of about one-third the body 

 width separates the upper ends of the parapodial ridges. At the 

 ventral end of the ridge is a ventral cirrus with a tuft of long setae 

 just dorsal to it. There follow rows of shorter setae with gills inter- 

 spersed among them, and a dorsal cirrus is at the dorsal end of the 

 row. In one row there were five gills, but I cannot say whether this 



Figure 46. — Species of Ecpheosynb 



a, 6, Euphrosyne lorealis 0rsted : a. Anterior end, x 6 ; b, gill and dorsal cirrus, x 22.5. 

 c-f, Euphrosyne branchiata, new species : c. Anterior end, x 7.5 ; d, gill, x Q8; e, small 



seta, X 250 ; f, large dorsal seta, x 250. 

 g-i, Euphrosyne longisetis, new species : g. Gill, x 22.5 ; h, smaller seta, x 185 ; i, larger 



seta, X 185. 



number is constant in all somites. The gills (fig. 46, d) are com- 

 plexly branched and about as long as the setae. The long setae of 

 the ventral tuft very considerably in width and in the size of the 

 larger tooth but are all alike in general structure. At some distance 

 from the apex is a sharp tooth followed by a narrowing to the 

 curved, sharp apex. Just behind the apex is a very small, slender 

 tooth (fig. 46, e) . In the row with the gills are shorter but heavier 

 setae, which are hardly longer than the gills. They vary in size, 

 but all have the general outline shown in figure 46, /. Some are 

 smooth beyond the fork; others have the marginal lobing shown 

 in the figure. 



