COPEPODS OF THE WOODS HOLE EEGION" 



205 



dense fringe of spiniiles along the posterior margin ventrally and 

 laterally; genital segment divided; caudal rami more than twice 

 as wide as long. First antennae densely clothed with long setae; 

 exopod of first legs much shorter than endopod; inner expansion 

 of fifth legs scarcely reaching the basal quarter of the distal segment, 

 with five setae closely juxtaposed; distal segment narrowed at its 

 tip, with eight setae, one of the apical pair less than half the length 

 of the other and nonplumose. Total length, 0.4—0.5 mm. 



Male. — Smaller than the female; first antennae geniculate, the 

 terminal portion nearly as long as the basal. Endopod of third 

 legs produced apically into a long stout spine and two setae; fifth 

 legs much reduced in size, inner expansion of basal segment 

 narrow-triangular, with two small setae; distal portion made up 

 of three short segments of about the 

 same length. Total length, 0.35 mm. 



Remarks. — Tliis species can be told by 

 its small size and by the very long and 

 slender 2-segmented endopod of the first 

 legs; the 4-segmented fifth legs of the 

 male are also unique. It has never be- 

 fore been reported from our American 

 shores. 



MICROTHALESTRIS LITTORALIS Sara 

 FiGUBB 136 



Microthale.stns littoralis Sars, Crustacea of 

 Norway, vol. 5, p. 369, suppl. pi. 11, fig. 1, 

 1911. 



Occurrence. — Ten females were taken 

 in a surface tow in Cuttyhunk Harbor, 

 July, 1925, by the present author. 



Distrihution. — Coast of Norway 

 (Sars) ; Adriatic (Steuer, Pesta) ; Gulf 

 of Genoa (Brian). 



Color. — Entire body semitransparent 

 and whitish, with a tinge of yellow in 

 the metasome and along the margins of the segments; eye reddish. 



Female. — Body a little stouter than in the preceding species, and 

 the epimeral plates better developed ; urosome segments fringed with 

 spinules as in the preceding species; genital segment often only in- 

 distinctly divided; caudal rami one-half wider than long, densely 

 setose on the lateral margins and both gurfaces. First exopod rela- 

 tively longer than in forfi.Gula; inner expansion of basal segment 

 of fifth legs quadrangular, somewhat squarely truncated at the tip, 

 which almost reaches the center of the distal segment and is armed 

 71937—32 15 



Figure 13 6. ■ — Micro thalestris 

 littoralis: a. Female, dorsal 

 (after Sars) ; b, female, fifth 

 leg 



