1917] Essenherg : New Species of Amphmomidae 65 



first sight in the general appearance, but differs from it in some essen- 

 tial characteristics. The setae in the two species differ in color and 

 in structure. The setae are brown and only of one kind in Euphro- 

 syne calypta; they are white in Euphrosyne aurantiaca, and the 

 dorsal setae are of two distinct kinds. Further differences are in 

 the location of the cirri. In E. calypta the mid-dorsal cirrus is between 

 the second and third gill-trunks; in E. aurantiaca the cirrus is 

 between the third and the fourth gill-trunks, counting from the dorsal 

 line. E. calypta has six pairs of three- to four-lobed branchiae on 

 each segment; E. aurantiaca has seven pairs of seven-lobed branchiae 

 on each segment. 



Occurrence. — The type is a dark gray color in alcohol. It has been 

 found in the channel off Santa Barbara. Further data lacking. The 

 other specimen is tan-brown in color. Its locality is unknown.' 



2. Euphrosyne multibranchiata sp. nov. 



PI. 4, figs. 4-5, 8-12 



Diagnosis. — Comparatively large-sized worm. Body elongated 

 obtusely rounded at both ends. Dorsal and ventral surfaces convex; 

 setae long and brittle; caruncle bilobed and long, extending to the 

 seventh segment. 



Description. — The classification of this species is based on a single 

 specimen. It is a large worm, for this genus. The length of the body 

 is 40 mm., the width in the widest part of the body (between segments 

 26 and 29) 13 mm., exclusive of the setae. From these segments the 

 width of the body decreases towards both ends. The body is elongated, 

 slightly wider in the center, very gradually decreasing in width 

 toward the ends, wiiich are obtusely rounded. The dorsal and the 

 ventral surfaces are convex and the segmentation is well indicated 

 on both sides by transverse ridges. The number of the segments in 

 this specimen is 45. Except for the narrow mid-dorsal bare line, the 

 dorsum is covered with rows of branchiae and setae. The color of 

 the worm is grayish-brown with ventral setae light yellow, almost 

 white. 



The prostomium is deeply sunken between the peristomial para- 

 podia and fused with the dorsally located bilobed caruncle. The 

 caruncle (pi. 4, fig. 11) is long with its free end extending to the 

 seventh segment. It is bilobed dorso-ventrally. The dorsal lobe is 

 grooved and evidently longer than the ventral, for it is coiled in a 



