COPEPODS OF THE WOODS HOLE REGION 



287 



Color. — Body as transparent and colorless as glass, becoming white 

 in preservatives; no eye visible. 



Female. — Body cylindrical, only slightly compressed ; cephalic seg- 

 ment two-fifths of the metasome length; rostrum small and poorly 

 defined; genital segment divided only at the sides; the 

 three abdominal segments the same length; caudal 

 rami as long as the anal segment, three times as long 

 as wide; apical seta transformed into a lancet-shaped 

 spine, a little longer than the ramus, with a filiform 

 bristle issuing from its base on the outer side. Second 

 segment of first antenna as long as the five following 

 segments combined; basal endopod segment of second 

 antenna divided, the exopod attached at the joint. En- 

 dopod of first legs as long as exopod, its basal seg- 

 ment with one inner seta, its end segment with three 

 apical setae; endopod of fourth legs longer than the 

 basal exopod segment and tipped with a single stout 

 spine heavily fringed with cilia toward its tip. Each 

 fifth leg a single lamina, as wide as long, with a coarse 

 denticulate spine at the outer corner and seven setae 

 around the distal end, the inner one the longest, the 

 others very unequal in size. Total length, 0.8-1 mm. 



Male. — Unknown. 



RemarJcs. — This species may be recognized by its 

 transparency, the peculiar apical setae on the caudal 

 rami and the fifth legs. This is the first record of its 

 occurrence in an American locality, and it is noteworthy that the 

 specimens were taken in fresh water. Of this species females alone 

 are known and of the following species only males, but the two are 

 so different in size and in the details of the appendages that it is 

 impossible for them to be the two sexes of the same species. Further- 

 more, the males were found in the open ocean where the water was 

 of normal salinity. 



STENOCARIS ARENICOLA, new species 



Plate 17 



Occurrence. — Two males were washed out of sand dredged off the 

 bottom in 23 fathoms of water 12 miles south of No Mans Land. 

 The male holotype is U.S.N.M. No. 63434. 



Color. — Body transparent and colorless, without a trace of pig- 

 ment; eye invisible. 



Male. — Body slender and cylindrical, ten times as long as wide, 

 the same diameter throughout; cephalic segment longer than the 

 first two free segments combined and slightly widened anteriorly; 



FiGDEB 177. 



8 t e n ocaria 

 minor: a. 

 Female, 

 fifth leg; 6, 

 female, cau- 

 dal ramus 



