1910.] ' NATURAL SCIENCES OF PHILADELPHIA. 381 



the prostomium, the dorsal border somewhat inflated above the palpi, 

 the remainder compressed and terminating in front of mouth in a 

 slender, pendant, finger-like process studded with numerous pediculate 

 globular papillae. 



Peristomium forming a narrow transverse fold above connected with 

 the nuchal fold, below a rugous lip. Its parapodia (Pi. XXXII^ fig. 85) 

 strongly compressed and prolonged straight forward, more than half 

 its length beyond the prostomium, the distal end slightly expanded 

 and bearing three rather small tufts of capillary seta?. Tentacular 

 •cirri with short, rather stout cirriphores arising from the dorsum and 

 venter of the expanded distal end, the dorsal directed somewhat 

 upward, the ventral chiefly outward; styles moderately slender, 

 tapered, without distinct subterminal or terminal bulbs and without 

 cilia. Mouth a small opening bounded by furrowed lips, the posterior 

 lip a broad plate occupying the entire ventral area of 11 and III and 

 cutting somewhat into I\'. 



Metastomial segments forming a flat ventral surface fairlv well 

 separated from the parapodia by a lateral furrow and differentiated 

 by shallow transverse furrows. To the twenty-ninth the Ijody is 

 nearly equally curved and tapered anteriorly and posteriorly; posterior 

 to this the caudal region is slender and attenuated. Ventral integu- 

 ment thick and opake, so that the neural area, though constituting 

 about two-fifths of the width, is not clearly defined from the muscular 

 as in some species, ^^enter so thickly studded with spherical tubercles 

 that in many places they touch over large areas, especially on the 

 parapodia. On the dorsum the integument is thinner and translucent 

 and is rather sparsely studded with small bluntly-conical papillse 

 (PI. XXXII, fig. 87). Anus a short dorsal slit extending through the 

 last four segments. 



Elytra fifteen pairs, on II, IV, V, VII and alternate segments to 

 XXIII, XXVI, XXL\ and XXXII, strongly imbricated, in genera,l 

 nearly circular with a slight lateral notch from which the broad linear 

 attachment extends to the center. Posterior ones elongated with 

 anterior attachment, the last about twice as long as wide and folded 

 with its fellow into a tube reaching somewhat beyond the pygidium. 

 In texture they are somewhat firmer and thicker than on the otlier 

 species here noticed. 



Dorsal fimbriated organs begin on VI and occur on all cirriferous 

 somites to and including XXXI. The first is small and the last two 

 rudimentary. On middle segments they are unusually large. They 

 are of lappet-like form, produced freely on the medial side. Free 



