of tlie Yirginian Coast 



269 



their inner back margin. The ventral cirri originate at 

 first near the base of the dorsal cirri (f. 159); further back 

 that part of the basal article carrying the dorsal cirrus be- 

 comes longer, bat the position of the ventral cirrus remain- 

 ing unchanged (f. 162), it now falls short of the base of 

 the dorsal cirrus. The middle third of the anterior seg- 

 ments is slightly convex above, otherwise the body in this 

 region is flat both above and below ; further back the out- 

 line is that shown in f. 364. The posterior set?e (f. IGl) are 

 longer and stouter than the anterior but not so numerous. 



In the single specimen found there were 320 segments; 

 the posterior portion of the body had been lost. 



Length observed, 90°"°". 



Diameterof head, 0.4°" ; breadth of third segment, 1.1"°*; 

 of 100th segment, 4'^'"; of 300th segment, 3.5°'°'. 



All the body measurements include the feet; and the 

 changes in width are almost entirely due to the increase, 

 and subsequent decrease, in the length of the feet; the 

 width of the body changing but very little. 



Color everywhere white. 



Found at extreme low water in soft mud. 



Trans. ix.'\ 35 



