348 PROCEEDINGS OF THE ACADEMY OF [April, 



ably uniform width to near the caudal end where they taper rapidly 

 into the minute pygidium. Neural furrow and lateral ridges little 

 marked but the ventral field as a whole prominent and very smooth; 

 the dorsal surface very little cross-furrowed. Nephridial papillae 

 begin at VI but are very minute and inconspicuous throughout, 

 often pigmented. Anal cirri similar to notocirri but longer, equal to 

 greatest width of body and parapodia without setae. Elytrophores 

 small and prominently elevated, with constricted pedicle and circular 

 bearing surface; because of their whiteness in a brown background 

 they are very conspicuous; fifteen pairs with the usual arrangement. 

 Parapodia (Pi. XXIX. fig. 19) rather short and small, little com- 

 pressed, their basal depth much less than the depth of the body and 

 their length nowhere exceeding by more than a trifle one-half the width 

 of the segments ; posterior parapodia not relatively longer than others. 

 Notopodia little prominent, flattened lobes prolonged into a short, 

 blunt, postsetal, acicular process. Xeuropodium much larger but 

 short and abruptly truncated, the nearly square or very broadly 

 rounded postsetal lip merging with the presetal lip at the dorsal 

 margin; the presetal lip prolonged from the dorsal margin into the 

 short, broad, blunt acicular lobe, which bears a minute finger-like 

 cirrus above the projecting end of the aciculum. 



Notocirrophore (Pi. XXIX. fig. 19) slightly dorso-caudad of notopo- 

 dium, short, reaching not quite to base of notopodial acicular process; 

 base swollen, the rest cylindrical and rather strongly curved. Style 

 exactly like median tentacle, scarcely reaching tips of longest seta 1 

 and but little beyond median line, longer near caudal end, rather richly 

 provided with sensory cilia with bulbous ends and nearly as long as 

 diameter of style. Neurocirri (fig. 19) with small cirrophore posterior 

 to ventral border proximad of middle of neuropodium; style very 

 regularly subulate, slender, short, not reaching end of postsetal lip 

 at level of aciculum; no sensory cilia. Xeurocirrus of II two-thirds 

 as long as ventral tentacular cirrus. 



Acicula as usual single, straight, tapering, yellow styles, both 

 projecting freely from the ends of their respective acicular processes. 

 Neuropodial seta? in four supra-acicular and seven or eight subacicular 

 series, nearly colorless, rather stout, nearly equaling notopodials in 

 this respect; the shafts straight and distal enlargements (Pi. XXIX, 

 fig. 21) of moderate length, gently curved and tapered, with from 

 sixteen (ventral) to twenty-two (dorsal) pectinated plates on each 

 side which are deeply and finely divided, becoming prominent and 

 somewhat imbricated toward the distal end, which is smooth for a ■ 



