1909.] . NATURAL SCIENCES OF PHILADELPHIA. 341 



ing smaller but otherwise unmodified. Strictly uniramal, the iieuro- 

 podia compressed, with obsolete postsetal lip and prominent, foliaceous 

 presetal lip divided by an acicular notch into a larger, broadly-rounded, 

 supra-acicular lobe and a somewhat shorter subacicular lobe ol)liquely 

 tapered to a blunt point. 



Notocirrophores large, those of all except most anterior segments 

 flattened and avuiculate (fig. 20), Notocirrostyles beginning with IV, 

 thin and membranous; typically broadly lunate-reniform, the exter- 

 nal border squarish, very regularly, closely and broadly imbricated, 

 covering and concealing the parapodia and posteriorly the entire 

 dorsum, but leaving the middle of the segments exposed anteriorly. 

 Toward the anterior end the styles approach a circular form and become 

 gradually smaller until practically the entire dorsum is left uncovered. 

 The notocirrus of III is the last tentacular cirrus, while the neurocirrus 

 of the same segment differs in no respect from those following. Neuro- 

 cirrophores prominent swellings at base of ventral side of neiu-opodia. 

 Neurostyles (fig. 20) oblong elliptical, with the broad distal end sub- 

 truncate, foliaceous, about equalling the neuropodia in size and reach- 

 ing to or, on anterior parapodia, beyond their ends. 



Aciculura single, stout, pale yellow, gently curved, with simple 

 bluntly pointed tip. Setse (PI. XVI, fig. 21) colorless, numerous (about 

 30, equally divided between supra- and subacicular groups on middle 

 segments), in a broad, fan-shaped fascicle. Shafts slender, shghtly 

 curved, slightly enlarged at the end; the very asymmetrical socket 

 prolonged on one side into a great spine with a few small teeth on its 

 base; the other side bearing a shoulder for articulation of the append- 

 age w^hich is supported b}^ a thin, scale-like process slightly fimbriated 

 at the end. Appendages long, about equal to the depth of the neuro- 

 podia, slender and delicate w^th the margin ver}' finely but distinctly 

 denticulated. The form of the articulation i-esembles the Eteone 

 type. 



Color generally, including prostomium and four anterior segments, 

 under parts, parapodia, lateral parts of notocirri and posterior fourth 

 of body, pale yellowish or yellowish ashy; exposed part of doreum 

 rich purplish-red with a fine blue-green iridescence. Inner thirds of 

 notocirri rich brown, together forming a pair of broad stripes extending 

 continuously for the anterior three-fourths and becoming darker anter- 

 iorly. Tentacular cirri except colorless tips, largely of a somewhat 

 darker brown. E3^es dark brown. 



Proboscis unknown. The type is a female ('(intaiiiing half-grown ova 

 which largely fill the ca^lom and enter the cavities of the parapodia and 

 notocirrophores. 



