COPEPODS OF THE WOODS HOLE REGION" 



211 



.2 



expansion of basal segment of fifth legs reaching the tip of the dis- 

 tal segment, and armed with five elongated setae; distal segment 

 oblong, with one apical seta, three on the outer, and one on the inner 

 margin. Total length, 

 0.75-0.9 mm. 



Male. — First antennae 7- 

 segmented, geniculate, the 

 terminal portion made up 

 of two segments; spine at 

 inner corner of second basi- 

 pod of first legs broad and 

 spatulate at its tip ; endo- 

 pod of second legs 2-seg- 

 mented, distal segment ob- 

 liquely oval, with two apical 

 spines, the inner one dirk- 

 shaped; fifth legs smaller 

 than in female, the basal ex- 

 pansion shorter than the 

 distal segment and subquad- 

 rangular. Total length, 0.7- 

 0.8 mm. 



Remarks. — This species 

 has never before been re- 

 ported from American shores. Sars said of it : " It occurs in the lit- 

 toral and sublittoral zones among algae, and is sometimes even left in 

 tidal pools." Some of the developmental stages are figured and de- 

 scribed by Brian in Studi del Laboratorio Marino Genova, 1921 

 (pp. 84-85). 



PSEUDOTHALESTRIS MINUTA (Claus) 



Figure 141 



WesHcoodha minuta Claus, Die frei lebendeii Copepoden, p. 118, pi. 21, 1863. — 

 Saks, Crustacea of Norway, vol. 5, p. 142, pi. 88, fig. 1, 1906. 



Occurrence. — Eight specimens, including both sexes, from a sur- 

 face tow in Little Harbor, Woods Hole, September, 1881, by Eath- 

 bun. 



Distribution. — British Isles (Brady, T. Scott) ; Helgoland 

 (Claus) ; coast of Norway (Sars) ; Woods Hole (Fish). 



Color. — Body light chestnut-brown, a patch behind the eye, a 

 transverse .streak across the center of the cephalic segment, and the 

 posterior margin of the same segment much darker in color; eye 

 dark red. 



Female. — Body short, stout, and decidedly pear-shaped ; metasome 

 segments telescoped one inside another ; cephalic segment more than 

 half the length of the entire body ; urosome ver}^ short and narrow ; 



FiGDKE 140. — Pseudothalestris nohilis: a. Female, 

 dorsal (after Sars); b, female, fifth leg; c, 

 male, fifth leg ; d, male, endopod of second leg 



