COPEPODS OF THE WOODS HOLE REGION" 



275 



one filiform and elongate. Basal expansion narrowed distally, with 

 five setae, the two inner ones smooth, the middle one the longest. 

 Total length, 0.75-0.9 mm. 



Male. — Unknown. 



Reviarks. — This species can be recognized by the details of the first 

 and fifth legs, and is here recorded for the first time outside of Nor- 

 way. It is worthy of note that the present specimens came from 

 perfectly fresh water, while Sars's types were taken from the ocean 

 at moderate depths. 



LAOPHONTE CORNUTA Philippi 

 FiGUBK 171 



Laophonte cornuta Philippi, Arch. Nat., Wiegmann, vol. 1, p. 189, pi. 3, fig. 13, 

 1840.— Sabs, Crustacea of Norway, vol. 5, p. 235, pis., 157, 158, 1907. 



Occurrence. — Both sexes were obtained from Nashaquitsa Pond, 

 Marthas Vineyard, July, 1926; four females were also taken from 

 one of the brackish ponds on Chappaquiddick Island, August, 1926. 



Distnhution. — Mediterranean 

 (Philippi, C 1 a u s) ; Madeira 

 (Fischer); British Isles 

 (Brady) ; coast o f Norway 

 (Sars) ; Gulf of Genoa (Brian) ; 

 Polar seas (Brady). 



Color. — Body brownish white 

 or gray, the first three free meta- 

 some segments darker and often 

 pink or even dark red; these 

 three and the cephalic segment 

 are bordered posteriorly with 

 narrow transverse bands of dark 

 brown. In larger specimens 

 irregular blotches of dark brown sometimes appear on the dorsal 

 surface of the genital segment ; eggs grayish white ; eye ruby red. 



Female. — Body slender and subcylindrical, the posterior margins 

 of the segments more or less elevated dorsally and fringed with 

 knoblike ^pinules; cephalic segment with a dorsal cephalic depres- 

 sion; rostrum broad, ending in an obtuse knob. Urosome, including 

 the caudal rami, as long as the metasome ; anal segment quadrangu- 

 lar, operculum tipped with a stout spine, somewhat erect; caudal 

 rami two and one-half times as long as wide, apical setae as long as 

 the abdomen plus the caudal rami. First antennae 4-segmented, 

 first segment with a small, second segment with a very large, 

 spine on the posterior margin. Exopod of first legs 2-segmented, 

 very narrow, end segment twice as long as basal segment with 

 three apical geniculate setae and two outer spines; endopod very 



Figure 171. — Laoiihonte cornuta: a. Fe- 

 male, first leg ; h, female, fifth leg ; c, 

 male, fifth leg 



