of the Virginian Coast. 41 
sented in f. 86, being found only on the posterior third of 
the body. 
Jaws (f. 88). The elongated pieces of the support are 
not attached in front to a polygonal piece as in D. filum 
Clpd., but coalesce. The posterior pair of maxillary pieces 
are denticulated at base, but the number of teeth varies 
from one to five. The part of this piece behind the teeth 
is very variable in width; it may be uearly double the 
width shown in figure, and shorter.. The second pair of 
jaw pieces have a peculiar form. Outer margin nearly 
straight, except in front, where it suddenly curves out- 
ward. The first tooth is long, the second quite short, the 
others of varying length as shown in the figure. The 
paragnathi or anterior small pieces, are of the same form, 
the anterior pair a little smaller than the posterior; each 
consists of a single sharp curved tooth, with two strong 
curved supporting branches at base. 
The lower jaw pieces are extremely variable, both as to 
form and number; usually their length is about double 
their greatest width, but their greatest width may be in 
any part ; the opposite pieces are never alike, often one is 
very minute ; sometimes there is but one, sometimes none. 
Body : general appearance same as Lumbriconereis. 
Often a few of the posterior segments have no appendages. 
Anal cirri four, short. Length variable. One not par- 
ticularly long specimen had 600 segments, with a length 
of 23""*- ; diameter 0, e""". 
Abundant at low water ; mud and sandy mud. 
LUMBRICONEREIS {Bl.) Ehlers. 
Lumbriconereis tenuis Verrill. 
Invert. Animals of Vineyard Sound, etc., p. 594, and p. 342. 
Sea Beach. Host Island. 
