246 PROCEEDINGS OF THE ACADEMY OF [April, 



but differs from that species in color, the form of the imcini and spines 

 and the greater number of marginal divisions of the pygidium. 



Lumbriclymene pacifica sp. nov. Plate XII, figs. 40-42. 



The type and largest complete specimen, which is unduly elongated 

 through maceration of the middle region, is 103 mm. long and 2 mm. 

 in diameter. 



The head (composed of prostomium and peristomium) is slightly 

 compressed laterally and very short, the length only very slightly 

 exceeding the depth. It totally lacks a cephalic plate and has a 

 nearly straight dorsal profile, meeting the vertical and convex anterior 

 profile at nearly a right angle. There is just the faintest indication of 

 a palpode and of the anterior end of the median ridge. About midway 

 on the side of the head a longitudinal furrow extends from the furrow 

 Yj to a point just over the mouth, and just anterior to the ends of 

 these furrows are the nuchal organs — a pair of small round depres- 

 sions. A few faint short furrows run from near the end of the longi- 

 tudinal furrow toward the mouth, and behind the latter the longitudinal 

 furrow is cut by a transverse furrow which is very strongly developed 

 on the dorsal side but fades out ventrally. From the posterior end 

 of the peristomium a short re-entering half-ring is cut off ventrally by 

 a rather distinct furrow which ends dorsally at the longitudinal furrow. 

 The mouth is a rather conspicuous transverse slit situated about 

 opposite the middle of the head and bounded both anteriorly and 

 posteriorly by rather prominent lips, the former of which is marked 

 by a short but deep longitudinal furrow. 



Somite II is slightly shorter than the head. Behind it the segments 

 increase regularly in length to IX at least, which is about three times 

 as long as the head. Behind this several segments are probably still 

 longer, but owing to their much softened state the exact length is 

 uncertain. At the posterior end XVI is about as long as VI or VII 

 and succeeding segments diminish rapidly, XIX and XX together only 

 about equalling V in length. The two achsetous preanal segments are 

 again much reduced. 



Except that at the extreme posterior end a few are provided with 

 prominent tori, all somites appear to be perfectly cylindrical. Somites 

 II, III and IV bear setae about the middle and just behind them is a 

 faint furrow. The next five bear them near the anterior end just 

 behind the glandular girdle. Posterior somites have their large swollen 

 tori situated near their posterior ends and bearing the small tufts 

 of setse above and moderately long lines of crochets below. The two 



