COPEPODS OF THE WOODS HOLE REGION 



353 



Female. — Metasome slender and fusiform, half as wide as long; 

 second metasome segment without a dorsal hump ; fifth segment ex- 

 ceptionally small. Urosome less than half 

 the length of the metasome; genital seg- 

 ment about one-half longer than the ab- 

 domen, widest at the center; caudal rami 

 shorter than the anal segment, but twice as 

 long as wide, the outer seta at the center 

 of the outer margin. Fifth leg as wide as 

 long, the inner apical seta twice as long as 

 the outer. Total length, 0.45-0.5 mm. 



Male. — Unknown. 



Remarks. — This is the smallest of the 

 species here described and may be recog- 

 nized by this fact alone if the specimen 

 is mature; the head is also widest across 

 its posterior margin. It is more of a 

 pelagic species than the others and is captured at considerable depths, 

 as indicated above. 



ONCAEA VENUSTA Philippi 

 FiGTJKH 213 



Oncaea venusta Philippi, Arch. Nat., Wiegmann, vol. 1, Jahrg. 9, p. 63, fig. 3, 

 text, 1843. — GnssBBEOHT, Fauna und Flora des Golfes von Neapel, vol. 19, 

 p. 590, pis. 3, 47, 1892. 



Figure 212. — Oncaea minuta: 

 a. Female, dorsal ; b, female, 

 urosome 



Figure 213. — Oncaeu venusta: a. Female, dorsal; ft, male, dor- 

 sal ; c, second antenna of female ; d, fourth leg of female. 

 (From W. M. Wheeler) 



Occurre7ice. — Two females taken in a surface tow, October 3, 1883, 

 at Station 2101, Albatross^ southeast of Nantucket; both sexes in 



