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 setae, 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 two 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, ver}' conspicuous. 



PerLstomium represented dorsally by a small nuchal fold, ventrally 

 produced forward and united with prostomium. Its parapodia bear 

 from one to three small c\u'ved seta^. 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, tiie lateral 

 pair embracing the facial ridge anteriorl^^ Metastomial segments 

 strongly arched anteriorl}', posteriorly depressed and tapering to the 

 minute pygidium which (on the type) bears a single cirrus resembling the 

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

 Neural groove broad and well defined. Nephridial 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 widtii of segments, 

 «tout, little compressed, interramal cleft little develojied, the notopo- 



