1910.] NATURAL SCIENCES OF PHILADELPHIA. 337 



Elytraphores 15 pairs, on II, IV, V, VII, to XXIII, XXVI, XXIX, 

 XXXII. They are rather small and only moderately prominent with 

 oval or slightly auricular scars from which the elytra are very easily 

 •detached. Alternating with them but more mesad in position are 

 small and simple rounded dorsal tubercles. Elytra (Pi. XXVIII, fig. 4) 

 of moderate size and rather thick, soft, texture. Except for a few 

 posterior segments they nearly or quite cover the dorsum. Those of 

 the first pair are small and irregularly circular, the second and third 

 pairs narrow and strongly reniform or bean-shaped; remaining ones 

 so far as known rather broadly ovate-elliptical with the broader end 

 lateral and the anterior border slightly concave or nearly straight. 

 The small scar lies well anterior and slightly lateral to the middle. 

 Except for a small translucent portion of the antero-medial border 

 the surface is thickly covered with hard tubercles, very small and 

 numerous at the antero-medial margin (figs. 4 and 5) but becoming 

 larger and fewer toward the postero-lateral margin (figs. 4 and 6). 

 With the exception of the very smallest these tubercles are knoblike 

 and bear on the summit two, three or more stout, sharp points; some 

 of them are very thickly studded with spines which vary in length 

 on different elytra. A variable number of tubercles near the posterior 

 border and in the neighborhood of the scar are much more massive 

 than the others; these likewise are studded with spines, long or short 

 according to the habit of the particular elytron; many of them are 

 surrounded by a raised ring. Marginal fringe extensive, passing 

 round nearly the entire exposed margin, the cilia slightly knobbed 

 distally and varying much in length, those on the posterior border 

 short and inconspicuous, those of the lateral border exceeding the 

 length of the largest papilla?. Scattered over the exposed surface 

 among the spines are numerous short cilia and slightly behind the 

 middle of the posterior border is a loose irregular tuft of cilia, some of 

 which are even longer than the longest lateral cilia. On the first pair 

 large rough tubercles are scattered round the entire margin and the 

 cilia have an even more extensive distribution but are much shorter. 



Color of middle portion of dorsum brown or olive; parapodia and 

 under parts chiefly colorless. Prostomium purple; eyes black; ten- 

 tacular elytrophores brown, the lateral very dark; styles of cephalic 

 tentacles, tentacular cirri and notocirri of setigerous segments beauti- 

 fully mottled brown and white with the white tip preceded by a brown 

 and this again by a white annulus at the beginning of the subterminal 

 enlargement. Facial ridge brown, palps and notocirri colorless. 

 Elytra, except for the translucent colorless portion, beautifully mot- 

 tled with brown, gray and white, the papillae brown or yellow. 



