244 



Annelida Ghcetapoda 



gular ; lower lip slightly largest. In the posterior half of 

 the body the length of the feet equals the width of the 

 segments ; not quite so long in front. 



Dorsal cirri, longer than feet : none on first setigerous 

 segment ; first shorter than second. Base cylindrical ; 

 appendix conical or fusiform, tapers rapidly to a pointed 

 extremity, forms about one-third the entire length of 

 cirrus. Constriction between the base and the terminal 

 article very deep. Blood vessels and seta very apparent 

 in the cirrus. 



Ventral cirri, arising at middle line of the foot, do not 

 reach quite to the end of the foot. 



Anal cirri : upper made up of four articles, subulate ; 

 lower, one article, similar in all respects to basal article of 

 upper cirri. 



Body, widest at anterior third, diminishing slightly in 

 front, and more rapidly behind. Convex above, flat below ; 

 segmentation well marked. 



Setae : the terminal article of the compound setae is 

 much shorter and stouter than in S. pallidus Yerr. ; fig. 90 

 represents a form occasionally seen in the anterior feet. 

 Simple setae of the upper bundle long, delicate, with one 

 edge minutely denticulated. 



Color, yellowish- white ; between the segments a narrow 

 red line ; a similar line crosses each segment, sometimes 

 falling a little short of the base of the feet. Just outside 

 of each posterior eye is a crescentic red line bounding a 

 clear white spot; while just back of each posterior eye is 

 an irregularly curved red line, also limiting a clear white 

 spot. Anal segment with a quadrangular clear white 

 spot. 



Length of a large specimen, 20™™ ; diameter, 2™™. 

 I^umerous, of all lengths from 4 to 20™™. On shells, 

 etc. Dredged. 



