1903.] NATUEAL SCIENCES OF PHILADELPHIA. 427 



nent fold which encroaches on it laterally, but emarginated dorsally 

 to accommodate the median tentacle. The anterior half of the per- 

 istomium bears the first tentacular cirrus and more ventrally the so- 

 called palpi. Tentacular cirri rather short and stiff, with very short 

 ceratophores ; the styles of the first conical, obtuse, with a length 

 scarcely exceeding the width of the prostomium; those of 2d peris- 

 tomial somite lanceoloid, acute; the dorsal one 3 times the length of 

 the 1st and reaching to somite X, the ventral f length of latter and 

 reaching to VII; tentacular (dorsal) cirrus of 3d (1st setigerous) 

 somite ec^ual to preceding dorsal tentacular cirrus, and reaching to XL 

 Remaining somites well marked, strongly arched above, flattened 

 below, increasing in length to middle of body. Caudal end blunt, 

 without cirri in this specimen. Almost entire body, except a few an- 

 terior somites, filled with eggs. 



Parapodia uniramal throughout, all parts more or less foHaceous, 

 least so anteriorly. Neuropodium flattened antero-posteriorly, the 

 presetal lobe much the larger, broadly rounded and divided by a nar- 

 row cleft at apex, postsetal lobe very short. Ventral cirrus leaf-like, 

 broadly ovate, the apex obtuse, much larger than neuropodium, pos- 

 teriorly overlapping and extending beyond it, obliquely attached by 

 basal half of dorsal margin to a flattened lobe-like process from the 

 ventral side of the neuropodium. Xotopodial cirrus reniform, with a 

 deep sinus ; long diameter, which is directly oblique to longitudinal 

 axis of body, twice short diameter; posteriorly they are more rounded, 

 overlapping from before backward, covering parapodia and leaving 

 the dorsum of body only exposed; ceratophores very broad, flattened, 

 slightly curved dorsad, with a wing-like ventral process which probably 

 represents the notopodium, but receives no aciculum. Form of para- 

 podia very constant throughout entire length of body, the anterior 

 ones becoming smaller and the last three at the caudal end simphfied. 



Set* all of one kind, arranged in a broad fan-shaped fasciculus, 

 colorless, compound, shaft very gently curved, sUghtly enlarged at 

 end; socket narrow, its wall deeply cut away on one side and slightly 

 thickened at that point to form a seat for the slender base of the appen- 

 dix, elsewhere high and provided on each side with one large and three 

 or four smaller teeth; appendix very delicate, elongate, attenuate, 

 normally straight, though often curved in preparations, the back 

 thickened, the edge knife-like and rather remotely serrulate with small 

 short teeth. 



The color is partially preserved; a rather broad band equal to i 

 width of back, of reddish-brown, marks the median dorsal region, be- 



