276 REPORT OF COMMISSIONER OF FISH AND FISHERIES. _ [570] 
from the last by an incision reaching about half way to the median line, 
Last segment entire, ovate behind, and cuspidate. The style on the 
second pair of branchial plates in the male is slender, surpasses the 
lamin, and reaches the middle of the terminal cilia; it is obliquely 
truncated at the end. 
Many of the specimens, especially the smaller ones, are furnished 
with a row of prominent tubercles along the back, and sometimes with 
lateral rows. \ 
Length, 10-25 ™™; breadth, 5-7.5"™, 
Long Island Sound to Bay of Fundy. 
ERICHSONIA FILIFORMIS Harger. Plate VI, fig. 26. (p. 316.) 
Stenosoma filiformis Say, loc. cit., p. 424, 1818. : 
Small, slender, and nearly linear in outline. Antennule not quite 
attaining the fourth segment of the antenne, which are six-jointed, and 
more than half as long as the body, with the first segment short, second 
and third increasing in length, last three segments about equal; head 
elevated between the eyes, where it is surmounted by a bifid tubercle ; 
first and second thoracic segments with a lateral salient angle behind 
the evident angulated epimera; third and fourth segments with their 
lateral borders emarginate, and the epimera concealed or rarely visible 
from above at the emargination; last three thoracic segments angulated 
in front of the epimera, which are also angular. This arrangement, 
especially in the smaller specimens, gives the appearance of fourteen 
serrations on each side of the thorax. There is a row of tubercles 
along the median line. Abdominal segments consolidated into a 
single piece, which is furnished with a divergent tooth on each side 
near the base, and is expanded and obtusely triangular at the apex. 
The style on the second pair of branchial plates in the male is strong 
and curved, surpasses the cilia, and is acute and sharply serrate near 
the end. 
Length, 5-9™™, 
Vineyard Sound to Great Egg Harbor, New Jersey. 
ERICHSONIA ATTENUATA Harger, sp. noy. Plate VI, fig. 27. (p. 370.) 
30dy smooth, narrowly linear in outline. Antennule slightly sur- 
“passing the second segment of the antenne, which are more than half 
the length of the body, and have the last segment longest. Head exca- 
vated in front; eyes small, black, prominent; first thoracic segment 
short; second, third, and fourth segments about equal in length, twice 
as long as the first; third segment broadest, last three segments gradu- 
ally decreasing in length. Epimera visible from above only in the last 
two or three segments, but the sutures are evident, except in the first 
segment, and their position moves gradually from the anterior portion 
of the segment in the second to the posterior in the seventh segment. 
Abdominal segments consolidated into a single piece, which is slightly 
dilated laterally near the base, and obtusely triangular at the tip. The 
