270 PROCEEDINGS OF THE ACADEMY OF [April, 



about equal to frontal tentacles, quadri-annulate ; stjdes two and 

 one-half times as long as ceratophores and reaching to middle of II. 

 Posterior paii-ed tentacles arise on the dorsal surface opposite the 

 middle of the prostomium and just within its lateral borders; cerato- 

 phores similar to. those of the anterior pair; styles reach somite VII 

 or VIII. Median tentacle behind center of prostomium, similar to 

 posterior paii-ed tentacles, but somewhat shorter, reaching only to 

 VI or VII. Palps cushion-like, arising from posterior ventral surface 

 close to mouth, diverging from median line, the broadly rounded ends 

 projecting beyond the sides of the prostomium. 



Peristomium very short above, in the median line only about 

 one-half as long as the prostomium, nearty twice as long at the sides 

 and carried forward to embrace the prostomium, the cephalic margin 

 as a consequence being deeply concave, ^^entrally it forms the usual 

 bilobed lip, which is quite distinct from II. Nuchal cirri arise from 

 extreme anterior border of peristomium in line with the posterior 

 paired tentacles and separated by a distance of twice their length, very 

 slender and tapered. Somites II and III equal and elongated, each 

 as long as prostomium and peristomium combined, but no wider than 

 the latter. Both are simple segments, widest anteriorly. Behind III 

 the segments gradually increase in width and decrease in length to X, 

 from which they remain neaily uniform for the length of the piece, 

 being quite simple and about five times as wide as long ; dorsally they 

 are flat, ventrally strongly convex, the parapodia arising high up. 

 Furrows well-marked and clean-cut and the cuticle very smooth and 

 highly u'idescent. 



Anterior parapodia (PI. XVII, figs. 58 and 59) elongated and rather 

 slender, prominently outstanding and fully equalling the width of 

 their somites, from the anterior ends of which they arise. The first 

 two are directed somewhat forward, but little more than those of 

 0. vexiUaria. From the ventral level of the fii'st they gradually rise 

 until the dorsal level is attained by the eighth. No important differ- 

 ence is noticeal^le among the first seven or eight. All have the some- 

 what prolonged, slightly flattened, neuropodial bod}^ terminated by 

 a short and broadly rounded presetal lip and a moderately prolonged 

 postsetal lip decidedly flattened at the base. Notocirri and neuro- 

 cirri clavate, with thickened bases and more slender distal parts 

 ending bluntly ; the former are longer than the postsetal lips and more 

 slender, and Ijelow their thickened bases, borne on a slightly con- 

 stricted notopodial base; the neurocirri more proximal in origin and 

 equal to or shorter than the postsetal lip. At the eighth foot the 



