174 



BULLETIN" 15 8, UNITED STATES NATIONAL MUSEUM 



Figure 118. — Ectinosoma 

 normani: a. Female, 

 dorsal (after Sars) ; i, 

 female, fifth leg 



long and considerably divergent, the first inner apical seta only 

 one-eighth as long as the third, the latter half the body length. 

 Fifth legs with few surface spinules; the two 

 apical setae of the distal segment and the 

 two setae on the inner expansion of the basal 

 segment very unequal, the outer one of the 

 latter pair the shortest; accessory seta of the 

 distal segment arising from the outer mar- 

 gin, inside and close to the base of the outer 

 seta. Total length, 0.45-0.55 mm. 



Male. — Considerably smaller than the fe- 

 male; genital segment distinctly divided into 

 two nearly equal portions; first antennae pre- 

 hensile, the third segment considerably en- 

 larged, with a fingerlike process on its pos- 

 terior margin; fifth legs similar to those of 

 the female, but much smaller. Total length, 

 0.35 mm. 



Remarks. — This species may be recognized 

 by its minute size, and in living specimens by 

 the bright red patches on the head. This is 

 the first record at Woods Hole, but Williams found it in Charles- 

 town Pond on the shore of Narragansett Bay. 



ECTINOSOMA CURTICORNE Baeck 



FiGUBH 119 



Ectinosoma curticorne Boeck, Forh. Vid.-Selsk. 

 Christiania, 1872, p. 45.— Sars, Crustacea of 

 Norway, vol. 5, p. 36, pi. 20, fig. 1, 1904. 



Occurrence. — Two females from Oyster 

 Pond, Falmouth, July, 1896; two females 

 from same pond, July, 1926. 



Distribution. — Scottish coast (T. Scott) ; 

 Norwegian coast (Sars); Spitzbergen, 

 Franz Josef Land, Nova Zembla (T. Scott) ; 

 mouth of Yana River, Siberia (Sars) ; 

 North Sea (Timm) ; Jadebusen (Poppe) ; 

 Chesapeake Bay (Wilson) ; Charlestown 

 Pond (Williams); Woods Hole (Sharpe). 



Color. — Body dark reddish brown, often 

 inclined to yellow ; a conspicuous dusl^y pig- 

 ment spot just inside the base of each first 

 antenna, near the lateral margin of the head. 



Female. — Body spindle-shaped, the greatest width in front of the 

 middle; rostral plate short and blunt; fifth segment as wide as the 



I'luunE 119. ■ — Ectinosoma 

 curticorne: a, Female, 

 dorsal (after Sars) ; 6, 

 female, fifth leg 



