1910.] ' NATURAL SCIENCES OF PHILADELPHIA. 363 



neural fui-row is Ijounded by low, smooth, lateral nuiscular ridgas. 

 Nepliridial papilla) 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 l^earing a pair of cirri about as long 

 ^s the median tentacle but much more slender. 



Parapodia (PI. XXX, fig. 43) long, directed strictly laterud and 

 enfiancing the appearance of depression; posteriorly they are rela- 

 tively long so that the extreme width remains neai'ly un if( )nn . Typical 

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

 obliquely truncate. Rami very unecjual, the notoi)odium a scarcely 

 differentiated process about halfway between the notociri-us and tip 

 of the neuropodium consisting chiefly of a rather short subconical 

 acicular process. Neuropodium large, little tapered, its oblitjuely 

 ])eveled end slightly compressed and divided into a low presetal lip, 

 slightly prolonged into a short acicular process surmounted ])y a sliort. 

 somewhat flattened supra-acicular cirrus, and an equally low i)ost- 

 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 notopodiimi, 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 beai-s a few scattered, 

 short, clavate sensor}' cilia. Neurocirrus arising from a very low 

 cirrophore on ventral side of foot halfway between nephridial ]:)a})illa 

 and ventral border of neuropodial setse 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 bhmt tips of l)oth projecting slightly. Seta; very imijer- 

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

 l)ody 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 tlie body, those 

 of the middle segments being probabl}' shorter and stouter. Xoto- 

 podials a small tuft, coloi-less, very slender and capillary with close 

 fine serrations for neaily entii-e length. Xeuropodials (PI. X.XXI, 

 figs. 45 and 40) in moderate numl)er, forming an obliquely vertical 

 fascicle not ai'ranged in the usual hoiizontal sei'ies, colorless, all deli- 



