1910.] NATURAL SCIENCES OF PHILADELPHIA. 363 



neural furrow is bounded by low, smooth, lateral muscular ridges. 

 Nephridial papillae begin on VI in the usual position and soon become 

 prominent, strongly clavate, appendages having a length about one- 

 half the diameter of the foot and projecting freely ventro-latero- 

 caudad. Pygidium a short tube bearing a pair of cirri about as long 

 as the median tentacle but much more slender. 



Parapodia (Pi. XXX, fig. 43) long, directed strictly laterad and 

 enhancing the appearance of depression; posteriorly they are rela- 

 tively long so that the extreme width remains nearly uniform. Typical 

 parapodia are scarcely compressed, subcorneal in form, with the end 

 obliquely truncate. Rami very unequal, the notopodium a scarcely 

 differentiated process about halfway between the notocirrus and tip 

 of the neuropodium consisting chiefly of a rather short subcorneal 

 acicular process. Neuropodium large, little tapered, its obliquely 

 beveled end slightly compressed and divided into a low presetal lip, 

 slightly prolonged into a short acicular process surmounted by a short, 

 somewhat flattened supra-acicular cirrus, and an equalhy low post- 

 setal lip. On the first two parapodia the neuropodium is shorter 

 and the notopodium larger; at the caudal end this condition is reversed, 

 the neuropodium becoming very long and slender. 



Notocirrus (PI. XXX, fig. 43) arising from behind base of parapodium 

 far mediad of notopodium, its cirrophore short and stout, directed 

 nearly laterad, style moderately slender with the distal half tapering 

 to a terminal filament which reaches barely beyond the end of the 

 neuropodium and not nearly to the middle line ; it bears a few scattered, 

 short, clavate sensory cilia. Neurocirrus arising from a very low 

 cirrophore on ventral side of foot halfway between nephridial papilla 

 and ventral border of neuropodial setae bundle but is so short that its 

 tip fails to reach either; basal half thickened, tapered to a filamentous 

 distal third, bearing a few cilia like those on the notocirrus. 



Acicula of the usual character, the neuropodial especially stout 

 and the blunt tips of both projecting slightly. Seta 1 very imper- 

 fectly known, all except those on a few segments at the ends of the 

 body being broken off flush with the surface. Most of those remaining, 

 like the exposed tips of the acicula are encrusted with a reddish deposit. 

 The description necessarily refers to seta? at the ends of the body, those 

 of the middle segments being probably shorter and stouter. Noto- 

 podials a small tuft, colorless, very slender and capillary with close 

 fine serrations for nearly entire length. Neuropodials (PI. XXNI, 

 figs. 45 and 46) in moderate number, forming an obliquely vertical 

 fascicle not arranged in the usual horizontal series, colorless, all deli- 



