112 BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM 



Female. — Head separated from the first segment; posterior cor- 

 ners of fifth segment produced into triangular wings, each tipped 

 with a small spine; genital segment no wider than the abdomen; 



caudal rami as long as the two abdominal 

 segments combined, and with the anal 

 segment covered dorsally with small 

 spines; second (basipod) segment of 

 fifth legs wider than long, third segment 

 with three spines on the outer margin, in- 

 creasing in size distally, and a broad spine 

 at the inner distal corner, which is diago- 

 nal to the long axis of the segment. 

 Total length, 1.4-1.6 mm. 



Male. — Urosome 4-segmented, the third 

 segment much the shortest ; posterior cor- 

 ners of the metasome smoothly rounded; 

 right fifth leg 5-segmented, left leg 4-seg- 

 mented; second and third segments of 

 right leg equal in length, each with a 

 process on the inner margin carrying a 

 spine; fifth segment much longer and 

 narrower than the fourth; second seg- 

 ment of left leg triangular, with two 

 spines on the outer margin; fourth seg- 

 ment enlarged toward the tip, where it ends in three processes, each 

 armed with a short seta. Total length, 1.4-1.6 mm. 



Remarhs. — Poppe noted that this species is not confined to salt 

 water but ascends rivers and estuaries into brackish water, and 

 through this to water that is perfectly fresh. It is likely to be found 

 therefore in any of the brackish ponds of the Woods Hole region 

 upon further examination. It may be recognized by the dorsal 

 spines covering the anal segment and the caudal rami, and by the 

 details of the fifth legs, especially of the female. 



EURYTEMORA HERDMANI Thompson and Scott 



Figure 75 



Eurytemora hcrdmani Thompson and Scott, Proc. Liveiijool Biol. Soc, vol. 



12, p. 78, pi. 5, figs. 1-11, 1897. — Giesbkecht and Schmeil, Das Tierreich, 



Lief. 6, Copepoda, p. 103, 1898. 

 Occurrence. — Two females were taken in a surface tow in Woods 

 Hole Harbor, September, 1881; 40 males and females, surface tow. 

 Woods Hole Harbor, July, 1925 ; 5 females, surface tow, Cuttyhunk 

 Harbor, July, 1925. 



Distribution. — St. Lawrence River (Thompson and Scott) ; Gulf 

 of Maine (Bigelow) ; Narragansett Bay (Williams) ; Woods Hole 

 (Sharpe, Fish). 



Figure 74. — Eurytemora afftnis: 

 a. Female, fifth legs ; b, male, 

 fifth legs 



