352 PROCEEDINGS OF THE ACADEMY OF [April, 



Peristomium not distinct, its parapodia (PI. XXIX, fig. 23) elongated 

 and reaching beyond cephalic peaks, bearing on its medial face two 

 small setae beyond which the cirrophores diverge slightly; styles of 

 tentacular cirri similar to median tentacle, the dorsal about as long 

 as the latter, the ventral slightly shorter. Metastomial segments 

 depressed, with strongly marked neural furrow and muscular ridges 

 below; segments anterior to XX of nearly uniform width, posterior 

 to that tapering regularly to pygidium which has the usual form but 

 has lost its cirri. Nephridial papilke begin on VI, when fully developed 

 prominent, subconical, with enlarged base and tubular end directed 

 dorsad between bases of the feet. 



Parapodia (PI. XXIX, fig. 24) very prominent, fully as long as width 

 of segments bearing them on middle of body and exceeding this 

 caudally, in basal part dorsal and ventral borders nearly parallel; 

 rami well differentiated. Neuropodium compressed and expanded 

 into a large, obliquely-ovate, foliaceous, presetal lobe prolonged 

 slightly into a tongue-shaped process and including in its dorsal border 

 the acicular process and aciculum. Notopodium rather prominent, 

 with a constricted base and compressed free setigerous lobe, its ventral 

 part prolonged into a very long, slender, tapered, blunt-ended acicular 

 process which reaches nearly as far as the neuropodial acicular process 

 and bears no terminal cirrus. The foliaceous lobes are largely devel- 

 oped on middle somites but are reduced toward the ends of the body. 

 Posterior parapodia become more slender and elongated. 



Notocirrophores (Pi. XXIX, fig. 24) arise ahnost in contact with the 

 notopodia but slightly caudad and dorsad of them ; they are cylindroid 

 with enlarged bases and reach far beyond the notopodial setigerous 

 lobe. Styles slender, elongated, reaching far beyond tips of setse 

 or well beyond dorsal median line, tapered nearly regularly, with very 

 slight subterminal enlargement, to a long filamentous tip; a very 

 few small clavate sensory cilia scattered throughout their length. 

 Neurocirri with short, well-differentiated cirrophores and rather long, 

 regularly tapered styles reaching to the middle of the foliaceous 

 presetal lobes. 



Acicula single in each ramus, stout and brown at base, tapering to 

 slender, colorless tips which project freely, the notopodial from the 

 end of the acicular process, the neuropodial from behind the tip of 

 the presetal lobe. Notopodial setae (PI. XXIX, figs. 27, 28) in an 

 irregular, slightly spreading tuft, moderately numerous, pale yellow, 

 rather stout, straight or slightly curved, tapered to blunt points and 

 practically smooth, the pectinations being nearly obsolete. Two 



