396 PROCEEDINGS OF THE ACADEMY OF [April, 



its length anterior to it (Pi. XXXIII, fig. 113). It is supported by a 

 notopodial aciciilum, dorsal and ventral to which on the medial side 

 arise the two tufts of capillary setae. Parapodial lamella a thin, 

 narrow elongated curved plate embracing the medial face of the 

 parapodium like a scale nearly to its end and covering most of the 

 lateral tentacle. Tentacular cirri arising close together on lateral 

 side of distal end of parapodium; dorsal with a short cirrophore and 

 style resembling the median tentacle but much more slender and only 

 about two-thirds as long; ventral Mathout distinct cirrophore and 

 style only about two-fifths as long as dorsal. 



Mouth bounded by a pair of lateral lips formed by II and a broad, 

 furrowed, posterior lip extending through III and IV. Body slender 

 and nearly linear, the dorsum more convex than the muscular venter, 

 transverse diameter little greater than vertical, sides nearly vertical 

 but owing to greater width at dorsum slightly overhanging. Seg- 

 ments scarcely defined, the furrows being obsolete and the cuticle 

 very smooth. 



Parapodia (with the exception of the first four pairs) projecting 

 directly laterad from near the ventral level, generally little longer than 

 one-half width of segments, somewhat compressed, dorsal and ventral 

 borders nearly parallel, the rami of equal length and separated by a 

 narrow cleft. Notopodium about one-half diameter of neuropodium, 

 broadly rounded and nearly truncate at the end, which bears a low 

 papilla in which the aciculum ends. Ventral to the acicular papilla 

 is a row of four or five short, finger-shaped processes or stylodes 

 increasing in length from behind forward and forming the chord of a 

 high-arched series of setae surrounding the aciculum and backed by 

 a low crenulated integumental fold. Neuropodium much deeper and 

 more compressed distally where it terminates in a low triangle, 

 the blunt apex of which lies nearer the dorsal than the ven- 

 tral side and which receives the tip of the acicidum. Surrounding 

 this acicular prominence is a flattened, incomplete ring or horse-shoe 

 of setae open anteriorly and backed by a low membrane bearing a 

 regular series of stylodes most of which are very short, but increase 

 in length both dorsally and ventrally where from four to six become 

 prominent. A single much longer stylode is appended to the tip of 

 the acicular papilla but is frequently wanting and is probably caducous. 

 Notocirrus separated from the papapodium by a rounded bay equalling 

 the latter in width, pendant from a prominent swollen cirrophore or 

 elytrophore and usually curved inward, short and thick, reaching 

 scarcely more than half way to the neuropodium and very densely 



