1909.] NATURAL SCIENCES OF PHILADELPHIA. 331 



exceeding ten or twelve and oftener fewer, colorless, transparent, with 

 rather stout, curved stems, terminating in enlarged, oblique ends 

 which appear to be quite smooth. Appendages usually about twice 

 as long as the oblique end of stem, with straight, simple points and 

 strongly developed marginal fringe. Parapodia of the last thirty 

 segments at least bear a single simple spine which projects prominently 

 from the dorsal part of the bundle. It has about twice the thickness 

 of the compound seta?, is very slightly curved and ends in a blunt 

 point. The most posterior project very prominently to quite the 

 length of the compound setae; further forward they are less conspicu- 

 ous, and anterior to XL none can be detected. 



Proboscis retracted and on account of the opacity and pigmentation 

 of the anterior end difficult to see. It appears, however, to have a 

 smooth margin. Gizzard in XV to XXII, with thirty-four rings. 



Color anteriorly pale brown owing to numerous granules in the 

 integument, passing through yellow into a nearly colorless posterior 

 end. 

 Autolytus sp.? 



A single example of a stock regenerating behind and incomplete 

 from the loss of many of the appendages. Length 16 mm., width 

 between tips of parapodia 1.4 mm.; segments 85 with a narrow 

 regenerating bud of 13 segments. 



Prostomium broadly ellipsoid, anterior and posterior borders nearly 

 straight, sides prominently convex; with the palps as seen from above 

 the outline nearly circular. Eyes two pairs with lenses, the anterior 

 nearly black, diameter about one-fifth width of prostomium, located 

 midway of the length of prostomium at its lateral borders, looking 

 outward and a little downward and forward; posterior brown, about 

 one-half diameter of anterior, with which they are in contact on the 

 dorso-postero-median side. Palps completely coalesced to tips, but 

 having a depressed median line and barely perceptible distal emar- 

 gination. Median tentacle lost, but one lateral tentacle present, arising 

 just above base of palp nearly in line with anterior eye, coarse, little 

 tapered, its length six or seven times prostomium and palps, but much 

 twisted and probably incomplete. 



Peristomium bearing large cirrophores, but only the ventral style 

 of one side remaining, this being one-half the length of the lateral 

 tentacle. Anterior segments imperfectly separated, the furrows 

 shallow; width increasing for about twenty segments to the gizzard 

 region and then nearly uniform to the end. A wedge-shaped median 

 elevation with apex at the peristomium extends over the first six or 



