1910.] NATURAL SCIENCES OF PHILADELPHIA. 335 



depressed. Segments 39. Type 29 mm. long; maximum width at 

 XII : body alone, 4.5 mm. ; between tips of parapodia, 8 mm. ; between 

 tips of seta?, 10 mm. 



Prostomium very small, its width less than one-fifth width of body, 

 broader than long; dorsal furrow shallow and short, the cephalic 

 lobes not well differentiated from each other or from the median 

 ceratophore. Peaks very short and blunt, inconspicuous, but diverg- 

 ing from the median tentacle, well above and largely free from the 

 lateral tentacles. Eyes tw r o pairs, black, conspicuous, the diameter 

 of each about one-eighth width of prostomium; the posterior pair 

 dorsal and near the postero-lateral border; the anterior pair ventro- 

 lateral, anterior to middle of prostomium. Median tentacle with 

 short, stout ceratophore half as thick and one-third as long as prosto- 

 mial width ; styles lost from both type and cotype. Lateral tentacles 

 with ceratophores one-half length and one-fourth diameter of median ; 

 styles nearly twice length of prostomium, the basal half nearly uniform 

 in diameter, followed by a slight enlargement bearing the abruptly 

 filamentous terminal third, sensory cilia few and scattered, short, 

 with slightly bulbous tips. Palps slender, terete or slightly five- 

 angled with prominent longitudinal lines of densely placed cylindrical 

 cilia, regularly tapered, about five to five and one-half times as long 

 as the prostomium. Facial ridge low but, owing to its dark brown 

 color on a white background, very conspicuous. 



Peristomium represented dorsally by a small nuchal fold, ventrally 

 produced forward and united with prostomium. Its parapodia bear 

 from one to three small curved setae. Cirrophores of tentacular cirri 

 prominent, reaching beyond anterior border of prostomium; styles 

 rather stout, subequal, the dorsal reaching to end of third quarter of 

 palps, the ventral slightly shorter, gently tapered to a fusiform sub- 

 terminal enlargement which passes abruptly into a terminal filament 

 less than one-fifth the total length ; sensory cilia scattered, short with 

 thickened ends. Mouth with the usual swollen, rugose lips, the lateral 

 pair embracing the facial ridge anteriorly. Metastomial segments 

 strongly arched anteriorly, posteriorly depressed and tapering to the 

 minute pygidium w T hich (on the type) bears a single cirrus resembling the 

 tentacular cirri but little more than half as long and entirety pale. 

 Neural groove broad and w^ell defined. Xephridial papilla? begin on 

 VI at postero-lateral border of segments, short and directed slightly 

 upward into the furrows. 



Typical parapodia rather short, less than one-half width of segments, 

 stout, little compressed, interramal cleft little developed, the notopo- 

 22 



