570 EEPORT OF COMMISSIONER OF FISH AND FISHERIES. 



from the last by an iiicisiou reaching about half way to the median line, 

 Last segment entire, ovate behind, and cus])idate. The style on the 

 second pair of branchial plates ^n the male is slender, surpasses the 

 laminae, 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 promiuent tubercles along the back, and sometimes with 

 lateral rows. 



Length, 10-25 """ ; breadth, 3-7.5'"'". 



Long Island Sound to Bay of Fundy. 



Erichsonia filiformis Harger. Plate YI, fig. 26. (p. 316.) 



Stenosoma filiformis Saj', loc. cit., p. 424, 1818. 



Small, slender, and nearly linear in outline. Antennuhe not quite 

 attaining the fourth segment of the antenn?e, which are six-jointed, and 

 more than half as loug 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 coucealed or rarely visible 

 from above at theemargination; 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, aud is expanded and obtusel^^ 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, Kew Jersey. 



Erichsonia attenuata Harger, sp. nov. Plate VI, fig. 27. (p. 370.) 



Body smooth, narrowly linear in outline. Autennuhie slightly sur- 

 l^assing the second segment of the antenna?, which are more than half 

 the length of the body, and have the last segment longest. Head exca- 

 vated in front; eyes small, black, i^rominent; 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 j)ortion 

 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 



