486 THE ANNELIDA POLYCHAETA. 



at all recurved. Along the outer edge of each outer series of paleae is a fold 

 along the edge of which is a series of low, rather stout, papillae, the precise 

 number of which was not determined. 



The gill-filaments are moderate in length, slender and numerous. The 

 number of plates and the precise arrangement of these and filaments were not 

 ascertainable. 



The peristomium ventrally is concave anteriorly where bordering the mouth. 

 On each side of the mouth it projects forward as a proximally very broad lobe, 

 which narrows cephalad, is distally rounded and is widely separated from that 

 of the opposite side. Proximally each lobe projects laterad as a thin, free, 

 ectally convex lobe. At its ectal base arises a stout, subcorneal cirrus which 

 extends cephalad and ends in a subacute tip. At the base of the cirrus is a 

 setigerous tubercle which is very small. 



The second setigerous somite is clearly separated from the first one. It 

 bears on each side three conspicuous cirriform processes, one at base of setigerous 

 lobe above, one of equal size farther dorsad, and at the level of the dorsum a 

 third one which is decidedly longer and stouter than the other two. Each 

 dorsal cirrus is transversely broad at base, flattened dorsoventrally, and narrows 

 strongly distad. 



The three following "thoracic" somites present each at the ventral border 

 of each side a low neuropodial lobe bearing a fascicle of numerous paleae of 

 moderate size. At the dorsal level of the side is a much stouter and longer, 

 subcylindrical notopodial lobe which bears a fascicle of much longer and stouter 

 paleae. On all of these somites on each side and in line with that of the first 

 somite is a stout, proximally broad and flattened, distally acuminate, notocirrus 

 (branchia) . 



The dorsum of the abdomen is mesally convex, with a longitudinal furrow 

 on each side separating off a lateral branchiferous ridge. The venter is depressed 

 as usual, two longitudinal and well-separated forms gradually diverging cephalad. 

 The long neuropodial setae on each side project mesad and widely overlap 

 those of the opposite side. The dorsal cirri, or branchiae, are stout and conical 

 like those of the thoracic division with which they form continuous series. 

 Those in the widest region of the abdomen are largest, these when laid mesad 

 nearly touching each other at thek tips, but separating more widely caudad 

 until the slender posterior region is reached. The uncinigerous tori are incon- 

 spicuous. They lie on the sides between the cirri and the neuropodia, as usual. 



The dorsal thoracic paleae are long and strongly flattened. Each widens 



