1905.] NATURAL SCIENCES OF PHILADELPHIA. 545 



its tentacular processes, and tapers from a broad base to the abruptly 

 contracted tip which is not longer than the basal diameter and scarcely 

 filamentous. The tentacular processes are largely united along the 

 medial face with the base of the median tentacle, their tips only being 

 free for a short distance; the style is similar to the median one, but 

 somewhat more slender, slightly shorter, and with a longer terminal 

 filament having a length of fully twice the basal diameter. The 

 palpi are very stout, bulge widely beyond the sides of the prostomium 

 at the base, and taper abruptly at the end to a short, acute appendage, 

 five longitudinal lines extend for their entire length. On the two sides 

 the dorsal tentacular cirri are of very unequal length, one exceeding 

 the median tentacle, the other being considerably shorter than the 

 lateral tentacle, which is just equalled by the ventral tentacular cirri 

 of both sides; in form they are similar to the median tentacle. The 

 mouth is large with very rugous lips. 



There are 26 segments, all of which are broad and stout, and the 

 posterior ones relatively little reduced, though the body is clearly com- 

 plete. Nephridial papillae begin on VHI and continue to XXVI; they 

 are elongated, the basal half adnate, the distal half free and curved 

 outward and upward between the parapodia. The caudal cirri are 

 similar to the dorsal cirri, but more tapered and longer, equalling the 

 last 4 segments. 



Typical parapodia (fig. 35) are very short and thick, those in the 

 middle region about | the width of the body. The neuropodium is 

 obliquely truncate with a very short presetal acicular process near the 

 dorsal angle. The notopodium is a small, rather slender lobe on the 

 antero-dorsal face of the neuropodium and is divided into a prolonged 

 acicular process and a setigerous papilla. The ventral cirrus arises from 

 a rather stout ceratophore near the base of the neuropodium, and its style 

 tapers to a slender tip which reaches slightly beyond the end of the 

 ventral border of the neuropodium. The dorsal cirrus has a very large 

 tapering ceratophore borne partlj^ on the postero-dorsal portion of the 

 parapodium and partly on the bod}" wall and reaching beyond the end 

 of the notopodium ; the style has the form of the lateral tentacles and 

 extends beyond the tips of the longest sette. The last dorsal cirrus is 

 borne on the posterior face of its parapodium and tapers more regularly 

 from base to tip than the others. The ventral cirrus of II resembles in 

 form and size the ventral tentacular cirrus. 



There are 12 pairs of elytra (fig. 32) situated as usual in the genus. 

 Notwithstanding their large size they fail to cover the broad back, 

 which is largely exposed along the middle. All, including those appa- 



