COPEPODS OP THE WOODS HOLE REGION 



175 



fourth and the same width as the genital segment ; caudal rami twice 

 as long as wide and only slightly divergent, the first inner apical seta 

 one-sixth as long as the second, which is half as long as the body. 

 Fifth legs with several transverse rows of slender spinules across the 

 surface of both segments; distal segment unequally trilobate, its 

 setae elongate, with short plumes ; three accessory setae arising from 

 the posterior surface near the base of the segment, the middle one the 

 longest. Total length, 0.6-0.75 mm. 



Male. — Unknown. 



Remarks. — This small species is evidently a northern form and 

 widely distributed; it can be recognized most easily by the dark pig- 

 ment marks near the bases of the 

 first antennae. 



ECTINOSOMA ELONGATUM G. O. Sars 



Figure 120 



Ectinosoma elongatum Saes, Crustacea of 

 Norway, vol. 5, p. 32, pi. 18, fig. 1, 

 1904. 



Occurrence. — Eight females were 

 washed out of dredged sand from 

 the sea bottom between Gay Head 

 and No Mans Land, July, 1927. 



Distribution. — Norwegian fiords 

 (Sars). 



Color. — Body a light yellow, more 

 or less tinged with brown, but with- 

 out any definite pigment markings. 



Female. — Body elongate, the 

 greatest width at the center; ros- 

 trum narrow, spoon-shaped, and 

 nearly horizontal; caudal rami as 

 long as anal segment, but seeming longer because the anal segment is 

 deeply incised posteriorly. First antennae very slender, 6-segmented ; 

 exopod of second antenna reaching beyond the tip of the endopod. 

 Fifth legs of medium size, the distal segment longer than wide and 

 somewhat oblique, with a transverse row of spinules across its base, 

 and just distal to these the accessory seta. The three setae at the tips 

 of the lobes are very unequal, the inner one the shortest, the middle 

 one three times as long, all minutely plumed. Inner expansion of 

 basal segment narrow, reaching beyond the center of the distal seg- 

 ment, its inner apical seta the longer. Total length, 0.8-0.95 mm. 



Male. — Unknown. 



Remarks. — This is the first record of the species outside of the 

 locality where Sars obtained it. It can be most easily recognized by 



Figure 120. — Ectinosoma elongatum: 

 a. Female, dorsal ; 6, female, fifth 



leg 



