Zool.— Vol. I.] JOHNSON— PACIFIC COAST ANNELIDS. 157 



sincere and heartfelt thanks for the many courtesies ex- 

 tended to me by the directors of the Hopkins Seaside Lab- 

 oratory at Pacific Grove, where I have on several occasions 

 occupied an investigator's room, and enjoyed conveniences 

 and advantages for marine zoological work elsewhere un- 

 known on our coast. 



Family I. EUPHROSYNID^. 



Euphrosyne aurantiaca, sp. nov. 

 Plate V, Figs. 1-4. 



Form elongate-elliptical, slightly tapering at both ends, which are very 

 uniform. Dorsal and ventral contours both convex, the ventral more so than 

 the dorsal. Medio-dorsal bare stripe very narrow (1-1.5 mm.), not more 

 than one-fifth the width of the body. 1 



Number of somites, 30-37. Buccal somites, first to fifth inclusive. Width 

 of middle somites, 5 J times their length. 



Caruncle bilobed dorsoventrally. Lobes coalesced the whole length of 

 the shorter, inferior lobe, which reaches the anterior border of the fifth 

 somite. The free posterior tip of the superior lobe extends back of this 

 point about one-half the width of the fifth somite. The anterior edge of the 

 caruncle carries a short, stumpy tentacle, at the base of which are located the 

 single pair of dorsal eye-spots. 



Prostomium not distinct from the caruncle, deeply sunken between the 

 forwardly directed parapodia of the first somite. Ventrally, close to its ante- 

 rior border, are the ventral eye-spots, flanked on each side by a minute 

 antenna, which springs from the lateral edge of the prostomium. 



Parapodia with three cirri, two dorsal, one ventral, and seven ramose ' 'gills. ' ' 

 Ventral cirrus inserted among the ventral seta;, gradually and evenly tapered 

 from its base, about one-half the length of the ventral seta?. Lateral cirrus 

 similar in form, placed between the third and fourth gills (counting from the 

 dorsal extremity of the series). Dorsal cirrus stout, slightly swollen near 

 base, evenly tapered, acute at tip, bent towards the median line. In con- 

 tracted condition, none of the cirri are longer than the seta; among which 

 they are placed. 



"Branchiae" bifid nearly to base; each branch carries 6 or 7 branchlets (fig. 1). 



Seta; numerous on all the parapodia; those of the ventral series simply 

 forked near tip; those of dorsal series deeply incised and curved at tip (figs. 

 2, 4), serrated on both sides of incision. All seta; are hollow to tip and im- 

 pregnated with calcic carbonate, which gives them a glistening white ap- 

 pearance. 



Color in life orange, darkest along mid-ventral line. 



Measurements. — Length of average specimen, 21 mm; greatest breadth, 



1,1 Width of body " or transverse diameter in every case includes the parapodia, but 

 not the setae. 



