of the Virghiian Coast. 53 
The stout setaB of the 5th segment are bluntly rounded 
externally, either straight, or slightly curved at tip (f. 121). 
Three or four short flat capillary setse curve around the 
anterior margin of the first stout setse, and lie directly 
across them. 
Ventral setse ; from the 7th segment stout, bidentate ; 
lower tooth much longer than upper (f. 122), and covered 
by membrane. They barely project from the surface; are 
curved within the body. 
Color. Anterior part flesh-color passing into white 
behind. 
A single specimen was found living in a tortuous gallery, 
excavated in a perfectly sound upper valve of Anomia 
glabra Verr. The gallery was lined by a membrane, which 
formed a tube projecting about 4™™ beyond the surface of 
the shell. The channels in the tentacles were densely 
covered with cilia. The long tentacles were almost con- 
stantly protracted and moved about. The cilia of the 
branchiae were very long and numerous. 
Length, 19°'°'; diameter, in front, l""""; behind, 0.5°"°. 
This species can readily be distinguished from any pre- 
viously described from our coast by the purple markings 
on the tentacles. Though living in a gallery in a hard 
shell, it lacks the dorsal hooks of P. hamaia and P. hoplura 
Clpd. 
Fam. ARICIID^. 
ARICIA {8av) Aud. tfc Ed. 
Aricia rubra n. sp. 
PL. IX, FIGS. 123-126. 
Branchiae beginning on the 6th setigerous segment. 
Head elongate, conical, pointed, as long as the first three 
segments, having neither eyes, nor antennae. 
Branchiae: on the anterior segments nearly cylindrical 
