COPEPODS OP THE "WOODS HOLE REGION 



273 



LAOPHONTE STROMII (Baird) 



Figure 169 



Catithocamptus sPromli Baird, The natural history of the British Entomostraca, 



p. 208, pi. 27, figs. 3, 3a, 1850. 

 Laophonte striimi Saes, Crustacea of Norway, vol. 5, p. 251, pis. 171, 172, 1908. 



Occurrence. — Thirty specimens, including both sexes, were ob- 

 tained from Penzance Pond, Woods Hole, August, 1925; found in 

 smaller numbers in one of the brackish ponds on Chappaquiddick 

 Island, in Quisset Pond, Falmouth, the Eel Pond, Woods Hole, Great 

 Pond, Falmouth, and Nashaquitsa Pond, Marthas Vineyard. 



Distribution. — British Isles (Baird, 

 Brady) ; Franz Josef Land (T. Scott) ; coast 

 of Norway (Sars) ; Adriatic (Carazzi, Gran- 

 dori, Pesta). 



Color. — Pale yellowish white and quite 

 transparent, without pigment markings ; eggs 

 white, each with a minute red dot at its cen- 

 ter; eye dull red. 



Feniale. — Body slender, four times as long 

 as wide, tapered posteriorly; cephalic seg- 

 ment nearly as long as the rest of the meta- 

 some, the second, third, and fourth segments 

 as wide as the head, the fifth segment con- 

 siderably narrower; urosome two-thirds as 

 long as metasome, the last two segments of 

 abdomen of equal length; caudal rami twice 

 as long as wide, squarely truncated at the 

 tip, apical seta two-thirds as long as the 

 whole body. First antennae 7-segmented, 



two basal segments enlarged; exopod of second antenna minute, 1- 

 segmented, attached to side of basal endopod segment. Basal endo- 

 pod segment of first legs stout, fringed with long hairs on both 

 margins; first exopod 3-segmented, end segment with two apical 

 geniculate setae and two outer spines. Fifth legs of moderate size ; 

 distal segment as wide as long, much narrowed at its base, with six 

 very unequal setae, the second inner one filiform and much the 

 longest; basal expansion reaching beyond the center of the distal 

 segment, with five setae, the middle one the longest. Total length, 

 0.8-0.9 mm. 



Male. — Second and third metasome segments as wide as the head 

 and much longer than the narrowed fourth and fifth segments; 

 urosome cylindrical, the segments not expanded laterally. First 

 antennae much enlarged, 6-segmented, the fourth segment swollen 

 into a sphere, the end segment sharply pointed. Exopods of second 



m 



Figure 16 9. — Laophonte 

 stroma : a, Female, first 

 leg ; 5, female, fifth leg ; 

 c, male, fifth and sixth 



