338 PROCEEDINGS OF THE ACADEMY OF [June, 



their diameter nearly one-third width of prostomium, situated just 

 posterior to middle of length close to posterior borders of prosto- 

 mium and looking dorso-laterad. Frontal tentacles arising by re- 

 stricted bases, widely separated on antero-lateral borders of prosto- 

 mium, long, slender and subulate, tapered regularly from above base 

 to slender tip ; the dorsal one and one-half times or more the length of 

 prostomium, the ventral about as long as prostomium. Study of 

 additional material may modify the last statement, as some of the 

 tentacles of both specimens have evidently suffered injury and one 

 (type) has two, the cotype one, in regeneration as small knob-like buds. 

 The cells of the prostomium form a small rosette-like radiation anterior 

 to the eyes, but there is no indication of a median tentacle. 



Peristomium completely crowded beneath prostomium, projecting 

 as lateral lobes merely, from the upper part of which arise the two pairs 

 of tentacular cirri. No nuchal papilla. Posterior lip prominent. 

 Somites II and III very short but distinct, except that ventrally the 

 former coalesces with the prostomium to form the lower lip. Tentacu- 

 lar cirri (fig. 15) all unusually long and slender, regularly tapered, with 

 well-developed cirrophores. The peristomial arises at about the level 

 of the foliaceous notocirri and reaches to about XII; the dorsal of II 

 is at a higher level and reaches XVII; ventral of II at a very low level 

 and equals peristomial; that of III at nearly the level of succeeding 

 notocirri and reaches XIV. Three or four small setse arise from a small 

 tubercle between the cirri of II and a fully developed neuropodium 

 occurs on III. Anterior segments all very short and distinctly 

 biannulate; farther back they become nearly half as long as wide. 

 Pygidium a rather long ring, but cirri wanting. 



Parapodia (PI. XV, fig. 16) unusually small, projecting very little 

 from side of body, the neuropodium flattened, with postsetal lip obso- 

 lete and preset al lip large and broadly rounded distally with a very 

 slight notch, from which the point of the aciculum projects (fig. 17). 

 Xeurocirrus very strongly foliaceous, broadly subovate, several times 

 larger than neuropodium on all somites, completely concealing them 

 from behind and bending dorsad until on most somites it meets the 

 notocirrus; arrangement of veins radial. Notocirrophores prominent, 

 somewhat flattened domes, two or three times as large at the neuro- 

 podia on middle segments. Strongly foliaceous, thin, imbricated but 

 covering only a small part of the sides of the body, of moderate size 

 but very large in comparison with the neuropodia, broadly cordate 

 with apex bluntly rounded (usually broader at the end than the one 

 figured) and base deeply excavated, with deep } T ellow-brown vein- 

 forming a dense bipinnate figure; rather easily detached. 



