1910.] NATURAL SCIENCES OF PHILADELPHIA. 345 



enlargement, terminal filament short or indistinct; the dorsal about 

 four-fifths, the ventral three-fourths length of palpi. Mouth sur- 

 rounded by a furrowed trilobate lip. Remaining segments well marked. 

 Greatest width near anterior end (VII or VIII), thence body regularly 

 but very gently tapered caudad. Neural furrow distinct and dee}). 

 Nephridial papillae not clearly seen, evidently very small. Dorsum 

 with intersegmental furrows well developed except in pharyngeal 

 region. Dorsal tubercles small and inconspicuous. Pygidium larger 

 than usual in the family ; anus dorsal. Anal cirri lost but a pair of 

 small cirri, evidently the last notopodials, at sides of anus. 



Parapodia (fig. 14) rather prominent, nearly equalling width of 

 body on middle segments. In the type the base somewhat swollen 

 with eggs, thence tapered distad to the pointed apex. Neuropodium 

 large, compressed, tapered to a prominent, acutely triangular, flattened, 

 acicular lobe, beyond which the aciculum appears not to project 

 (fig. 14 a ). Notopodium of typical parapodia reduced to a small 

 antero-dorsal setigerous lobe with a finger-shaped acicular process 

 at its ventral border from the end of which the tip of the small aciculum 

 projects. 



Notocirrophores small, but rather elevated, situated a little'dorsad 

 and caudad of notopodia; styles short, reaching tips of neuropodial 

 setse only, subulate with thickened base tapered to slender, acute point, 

 bearing a very few minute clavate sensory cilia or none. Neurocirri 

 arising far out beyond middle of ventral face of parapodia, not reaching 

 end of neuropodia, slender, regularly subulate, acute. Neurocirrus 

 of II about twice as long as its parapodium, nearly equal to ventral 

 tentacular cirrus. 



Elytra 15 pairs, having the customary arrangement, small, and little 

 elevated. Elytra (Pi. XXVIII, fig. 15) easily detached, only slightly 

 imbricated and barely covering dorsum. First pair subcircular and 

 completely hiding prostomium, its small scar slightly caudad of middle; 

 the next two strongly reniform with a deep hilum close to which is the 

 scar of attachment; succeeding ones larger, broader and less deeply 

 emarginate, with the scar slightly antero-lateral of the center; the 

 last pair, finally, subquadrate-elliptical with the attachment anterior 

 to the center. All are thin, delicate and membranous, perfectly 

 smooth, and entirely lack cilia and tubercles, except for a small area 

 of minute, rounded corneous granules just behind the hilum. They 

 are pale and daintily colored, with a bluish-gray ground and white 

 subcentral spot, a pale brown postero-medial submarginal crescent 

 and a small more deeply colored pigment spot over the point of attach- 



