1906.] NATURAL SCIENCES OF PHILADELPHIA, 225 



with long, slender, curved shafts, the ends of which are rather abruptly 

 enlarged and not very oblique, and are provided with only a few small 

 teeth at the apex. The appendages or blades are strongly hooked and 

 bifid at the end and distinctly fringed. The shortest posterior ones 

 have a length of about one and one-third times the diameter of the end 

 of the shaft, the longest about four and one-half times that diameter. 



Both specimens are entirely colorless and the large one is filled with 

 masses of sperm. 



The type comes from Admiralty Inlet, near Port Townsend, Wash- 

 ington, Station 4,219, 16 to 26 fathoms, on a bottom of green mud with 

 sand and broken shells. A fragment was taken at Yes Ba}^, Behm 

 Canal, 130 to 193 fathoms, bottom of gray mud. 



Stauronereis annulatus sp. nov. Plate X, figs. 12, 13, and Plate XI, figs. 18-22. 



The larger example (much contracted) is 13 mm. long and about 1 

 mm. wide exclusive of the setse, and has 72 segments. The other is 9 

 mm. long with 62 segments. 



The prostomium (fig. 12) consists of a broad shovel-like anterior 

 process and two short segments, each bearing a pair of tentacles and a 

 pair of eyes. Although these two divisions or rings are about equal, 

 both the eyes and tentacles of the anterior one are much the larger. 

 The anterior tentacles (palpi) arise from the ventro-lateral region of 

 the first annulus. Each consists of a large and very stout basal piece 

 strongly curved backwards by the sides of the head and bearing on its 

 end a very small ellipsoidal terminal article. Just above the base of 

 each, on the dorso-lateral region of the head, is a large very dark brown 

 eye. Immediately behind and slightly above the large eyes the second 

 pair of tentacles are borne on the second annulus. They are about as 

 long but not so stout as the anterior ones, are cylindrical in form and 

 consist of six or seven nearly spherical articles. The second pair of 

 eyes are minute dark brown spots about one-fifth the diameter of the 

 anterior pair, and are situated on the dorsum of the second annulus 

 about half as far apart as the anterior pair. The mouth is small and 

 bounded behind by the second somite, and from it project the ends of the 

 jaws (fig. 18). Owing to the retracted state of the proboscis the jaw 

 apparatus is not all visible. A specimen cleared in glycerine shows 

 on the dorsal side a lenticular area having a very dark brown border 

 and a paler interior enclosing a small central space. In ventral view 

 are seen the pair of dark brown mandibles (fig. 18) with slender bowed 

 bases and curved, divergent, tapering end-plates bearing about seven 

 strong teeth along the medial margin. 

 15 



