254 THE ANNELIDA POLYCHAETA. 



annulate, though the transverse wrinkles may to some extent be due to partial 

 drjdng. The median tentacle reaching to somite IX ; the inner paired tentacles 

 somewhat more slender than the median, but likewise reaching the ninth somite. 

 The outer paired tentacles are very short, reaching only to the second somite, 

 though the tips may have been broken off. 



Peristomium in length equalling or exceeding the succeeding three somites. 

 Indented at the median line in front, the anterior edge extending farther forward 

 laterally and ventrally. Dorsally conspicuously ribbed longitudinally. Ven- 

 trally transversely wrinkled and the lower lip crossed by longitudinal sulci. 

 Lower lip mesally deeply incurved. 



Somite II apodous as usual. Distinct dorsally and ventrally, but laterally 

 completely fused with somite I. Dorsally longitudinally ribbed. Cirri slender, 

 weakly annulate, extending but slightly beyond anterior margin of peristomium. 

 The succeeding somites bearing parapodia. Regular and undivided. Dorsally 

 strongly convex; with a sharply impressed median longitudinal furrow, this 

 less distinct anteriorly; longitudinally costate, the impressions distinct laterally, 

 fading out toward the middorsal region, and becoming less distinct, or absent 

 in caudal region. Ventrally only weakly convex; with a deep median longi- 

 tudinal neural furrow. Body becoming widest at or near the twenty sixth 

 somite. In this region the somites are five times wider than long. From this 

 point the body narrows strongly cephalad and is narrowest at the third somite; 

 caudad it remains of nearly uniform width to the caudal region, where it narrows 

 very gradually. 



Parapodia of the usual short and simple type. Neurocirri in anterior 

 region with conspicuously swollen bases, ovate in outline, and short, subconical, 

 apical divisions; caudad they undergo the usual change, the basal division 

 becoming smaller and not abruptly separated from the tip. Notocirri long, 

 much exceeding the neurocirri; thick proximally, but subulate and slender 

 distally. 



The branchiae begin on the ninth somite and continue throughout most 

 or all of the length (the caudal end of the type is missing and the presence of 

 branchiae on the somites of that part is uncertain, though probable). They are 

 throughout unilaterally pectinate; they are moderately long, moderately 

 exceeding the cirri, and, when laid against the dorsum nearly reach to the mid- 

 dorsal line; they are not erect, the flattened stalk being rather weak and show- 

 ing a tendency to curl; filaments simple, unusually short and relatively wide, 

 flattened and often curling. The maximum number of filaments noted in the 



ri 



