1910.] NATURAL SCIENCES OF PHILADELPHIA. 339 



perfectly smooth, four to four and one-half times length of prostomium; 

 sensory papillse not obvious. Facial tubercle unusually large, elevated 

 on facial ridge. 



Mouth large with prominent, pouting, trifid, furrowed lips, the 

 facial ridge passing between the anterior pair. Peristomium obvious 

 only through its parapodia which project well forward beyond the 

 cephalic peaks and bear on the medial side a prominent tubercle from 

 which projects the end of a stout brown aciculum and below this a 

 pair of stout notopodial setse; beyond this the cirrophores separate. 

 Styles of tentacular cirri similar to median tentacle which the dorsal 

 slightly exceeds, the ventral slightly shorter. 



Metastomial segments indistinctly separated by faint furrows, the 

 whole ventral surface forming a somewhat prominent sole-like struc- 

 ture, with the neural furrow and lateral ridges only moderately well- 

 marked. Nephridial papillae begin of VI ; small, flattened, inconspicuous 

 and projecting upward between the bases of the parapodia. Owing 

 to the peculiar elevation of the parapodia the dorsum of the body 

 appears to be depressed and gives the effect of a furrow. Elytro- 

 phores occur on II, IV, V, VII, IX, XI, XIII, XV, XVII, XIX, XXI, 

 XXIII, XXVI, XXIX and XXXII = 15 pairs; they lie well out on the 

 bases of the parapodia, are low and wide and often constricted below the 

 nearly circular free surface. Dorsal tubercles are subconical promi- 

 nences occurring at the same level as the elytrophores but projecting 

 beyond them slightly lateral. The greatest width is at about somite 

 X, anterior to which the sides curve broadly into the oral region and 

 behind which they taper regularly to the pygidium, which is a minute, 

 short, tubular segment with dorsal anus, below which is a common 

 cirrophore bearing the two very slender anal cirri exceeding in length 

 the greatest width of the body without parapodia. 



Parapodia rather short, on anterior and middle segments scarcely 

 more than one-half width of segments l)earing them. As indicated 

 above they slope doi-sad from the ventral siu-face rather strongly. 

 They are compressed and at the base rather deep, the rami only slightly 

 separated (PI. XXVIII, fig. 8). Notopodium very short and thick, the 

 moderately elongated, conical acicular ):)rocess obliquel}' truncated 

 at the end, projecting from its ventral margin and reaching to or 

 slightly beyond the end of the neuropodial acicular process. Neuro- 

 podium compressed, tapered to a blunt point and extended beyond 

 the notopodium by a foliaceous margin or presetal lobe including in 

 its doi"sal part the rather obscure acicular process, which is l)road and 

 fiat, nearty as long as the notopodial acicular process and beai-s at its 



