1911.] NATURAL SCIENCES OF PHILADELPHIA. 283 



Ninoe gemmea sp. nov. PI. XIX, figs. 101-109. 



Form moderately elongated, slender and terete, the anterior bran- 

 chiate region wider and depressed. A complete example (type) is 

 104 mm. long with a maximum width, exclusive of parapodia, of 2.4 

 mm. at XXX. Segments 146. 



Prostomium small, slightly longer than wide, distinctly depressed, 

 subovate, continuing the outline of the anterior end of the body 

 forward to a subacute apex, very smooth and differentiated only 

 indistinctly from the peristomium at the sides. The mid-dorsal 

 portion of the pro-peristomial furrow forms a broad but shallow, 

 semicircular or crescentic furrow, the horns of which end at a pair of 

 small translucent spots marking the tips of the forward lateral pro- 

 jections of the peristomium. It is uncertain whether or not a minute 

 obscure papilla exists at the bottom of this nuchal furrow. On the 

 ventral surface is a pair of slight submarginal longitudinal grooves 

 which meet the lateral furrows bounding the prominent quadrant- 

 shaped palps which are separated by a deep medial furrow. No eyes. 



The outline passing from the prostomium into the peristomium and 

 body is very regular and unbroken. Peristomium and somite II 

 apodous, together equalling the prostomium in length; the peristo- 

 mium longer at the sides, but dorsally cut into by a deep re-entering 

 bay, reducing it to the length of II. Ventrally they coalesce to form 

 a deeply furrowed lip. Segments simple, very smooth and regular, 

 and separated by deep, even furrows, the length to width ratio varying 

 from one to four or five at the anterior end to one to two at the posterior 

 end, toward which their length increases both relatively and actually. 

 From the point of gi-eatest diameter at about XXX, the body tapers 

 very regularly and gently to the caudal end, being for most of the 

 length strictly terete. Cuticle highly polished, with a pearly irides- 

 cence. 



Pygidium a small, obliquely flaring ring, bearing at the sides of a 

 small ventral platform a pair of conical cirri about as long as the 

 diameter of the pygidium. 



Parapodia strictly lateral, uniramous, with quite rudimentary noto- 

 podium. The first few are very small, slightly compressed tubercles 

 with obsolete presetal lip and subfoliaceous, cuneate-ovate postsetal 

 lip as long as the body of the foot (PI. XIX, fig. 101). Farther 

 back, in the branchial region, the presetal lobe becomes a hemispherical 

 swelling, which is again lost posteriorly. At VI, or in one case, V, the 

 postsetal lip bifurcates, the ventral lobe remaining as before, the dorsal 

 being cirriform and slightly longer. On succeeding segments the 



