[41] ANNELIDS OF PROVINCETOWN, MASS. 739 



teentli segment (fig. 91) it is reduced to a single, flattened, tapering 

 projection. Meanwhile the ventral lobe retains about the same size on 

 all segments, but shows great irregularities in the number and depth of 

 the incisions forming its lateral lobes. From the eighth segment the 

 dorsal rami and setae have an upward direction ; on theeighth they are 

 even directed inward, but as this does not occur on the segments behind 

 the eighth, it may be due to accidental distortion; in like manner the 

 ventral rami of the eighth segment are turned (disiilaced ?) upward ; 

 on all segments behind the eighth the ventral setae point directly out- 

 ward, instead of obliquely downward, as on the preceding segments. 



After the first two segments the setse of both rami are much alike, 

 but those of the dorsal rami, after the fourth segment, are much more 

 numerous, forming a stout, closely crowded bundle. 



The general outline of the body is shown in figs. 87-91, which are 

 lialf segments ; it is depressed with slightly convex dorsal and median 

 fields as far back as the sixteenth segment ; here the dorsum becomes 

 more convex (fig. 91). It is possible that this change may take place 

 somewhat more gradually than this statement would indicate, as the 

 dorsum is somewhat injured for a few segments anterior to the sixteenth. 



Ko color notes were made, but as we remember it the general color 

 was dirty white. 



Length of 22 segments, IS™"". 



Greatest width (at twelfth segment), S'"'". This width diminishes a 

 little forwards, the width of the first segment being 3"™. 



Dredged on a sandv bottom in about 20 fathoms. 



