of the Virginian Coast. 



241 



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 nearly 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, 6"""^. 



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. Hog Island. 



