260 PROCEEDINGS OF THE ACADEMY OF [April, 



The type is a complete example of 94 segments, 112 mm. long, with 

 a maximum body width at XXV of 4.8 mm. and a depth of 4 mm. 



Prostomiiim (PI. X^'I, fig. 41) in the strongly up-bent position in 

 which it occurs in both specimens nearly circular, the seven tentacles 

 radiating very regularly about its margin and as usual increasing in 

 length from before caudad. Frontal tentacles in contact medially on 

 the extreme anterior liorcler of the prostomium from which they are 

 scarcely delimited, little divergent, nearly two-thirds as long as the 

 prostomium, short ellipsoidal and slightly bilobate from a . shallow 

 lateral furrow. Probably the styles of none of the dorsal tentacles 

 are Cfuite complete, the ends of all being more or less worn and ragged. 

 The ceratophores of all are short, scarcely longer than thick and divided 

 into three or four annuli. The styles increase in both length and 

 diameter from before backward, the anterior paired reaching to II, 

 the posterior paired to XII or XIII and the median to XV. Palpi 

 large, subgloboid, slightly bilobed processes bounding the mouth in 

 front, in contact medially and projecting ventrad and laterally beyond 

 the sides of the prostomium. 



Peristomium reduced, scarcely half as long as the prostomium and 

 not much wider. Xuchal cirri (fig. 41) arising slightly behind anterior 

 border of peristomium in line with lateral border of base of posterior 

 lateral tentacles, slender, tapered, not quite reaching base of one of 

 opposite side. Posterior lip sonrewhat bilobed, furrowed, its antero- 

 lateral margins continuous with mandibular cushions and not pro- 

 jecting freely as in many species. Somite II much enlarged, more 

 than twice as long as I and nearly twice as wide, strongly convex 

 and rising beyond I on all sides and embracing it completely laterally. 

 Anterior region of body stout, not slender as in many species ; III and 

 IV rapidly reduced in length, V about normal; its width about six 

 times length. These proportions are maintained throughout the 

 middle region, but the width gradually decreases posteriorly until it 

 becomes only three times the length. Dorsum very strongly arched, 

 venter flat with neural groove. Body walls firm and muscular ante- 

 riorly, softer with translucent walls posteriorly. Caudal end tapered 

 rather rapidly to a short tubular pygidium with expanded rim bearing 

 a pair of very slender subanal cirri as long as the last eleven segments 

 and one and one-third times the greatest body width. 



Parapodia of anterior end much like those of Hyalincecia (PI. XVI, 

 figs. 42, 43). The first (fig. 41) much enlarged, most modified and 

 strongly bent forward at sides of prostomium to the level of its anterior 

 border, cylindroid or subconical and truncate, much and deeply fur- 



