CIRRATULUS MEG ALUS. 375 



Cirrhatula Templeton, Mag. nat. hist., 183G, 9, p. 234. 



Timarale Kinueiu;, Ofvors. K. vot. akad. Forh., 1865, no. 4, p. 254. 



Promenia Kinberc;, Op. cil., 1865, no. 4, p. 254. 



Archidice Kinbeug, Op. cit., 1865, no. 4, p. 255. 



CiRKATULUS MEGALUS, Sp. noV. 



Plate 70, fig. 1^. 



Special branchiae on first setigerous segment in a group of at least eight on 

 each side, the two groups widely separated by a naked dorsal area. A single 

 branchia on the second somite on each side. 



The number of setigerous segments in the two specimens is nearly 18G 

 and 205 respectively. Total length 260 mm.; greatest width about 13 mm. 



The color of the preserved specimens is a somewhat brownish grey, of a 

 greenish cast. A pale median longitudinal ventral line. Branchiae yellowish. 



The body is stout, widest near the middle and strongly tapering towards 

 both ends, with the caudal end somewhat the more pointed. The dorsal sur- 

 face is strongly convex, hemicylindrical, while the ventral surface is flat. There 

 is a conspicuous, fine, median longitudinal sulcus along the dorsum, the sulcus 

 deepest on the line separating the somites. 



The prostomium is short and wide. Anteriorly convex, semicircular; 

 depressed a little above the anterior margin, with a weak median longitudinal 

 sulcus. No eyes evident. (Plate 78, fig. 1). 



Peristomium long, equaUing the succeeding seven somites. Partially and 

 ■ irregularly divided into three rings above and laterally. Of these rings the last 

 two are divided by a transverse sulcus above, and the second has a median dorsal 

 triangular impression at its caudal border. The anterior ring is crossed above 

 and in front by a deep sulcus which at the middle is semicircularly curved for- 

 wards. Beginning near each side of the mouth is a weak furrow which runs 

 caudad and mesad to meet the one from the opposite side at the midventral 

 line on the caudal edge of the peristomium. The ventral area enclosed by these 

 furrows is divided by a transverse sulcus into a nearly smooth triangular area 

 and an anterior area between this and the mouth which is divided by transverse 

 sulci into four narrow transverse bands. Along the dorsolateral surface, espe- 

 cially of the caudal ring, are some short longitudinal sulci. The caudal border 

 of the mouth is divided into radiating ridges by numerous fine sulci. (Plate 70, 

 fig. 4). 



The first somite is longer than those succeeding; above it is conspicuously, 



