160 



BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM 



ACARTIA DANAE Giesbrccht 



Figure 108 



Acartia danae Giesbsecht, Atti Accad. Lincei, Rome, ser. 4, vol. 5, sem. 2, 

 p. 26, 1889 ; Faima unci Flora des Golfes von Neapel, vol. 19, p. .508, pis. 30. 

 43, 1892. 



OccwTcnce. — Three females from trawl wings, Stations 2195, 

 2236, Albatross, south of Nantucket and Marthas Vineyard. 



Distribution. — Tropical Atlantic and Pacific (Giesbrecht) ; north- 

 ern Atlantic (Cleve) ; South African coast (Cleve, Stebbing) ; 

 Banda Sea (A. Scott) ; Bay of Bengal, Gulf of Manaar (Sewell). 



Color. — Body colorless and fairly transparent, sometimes with 

 a slight bluish tinge around the mouth and the mouth parts. 



Female. — Body narrow and elongate; 

 fifth segment with short spines at the 

 corners; urosome one-third the length 

 of the metasome; genital and first ab- 

 dominal segments with minute spinules 

 along their posterior margins; first 

 antennae reaching the tips of the caudal 

 rami; second segment of fifth legs 

 longer than wide; end segment swollen 

 at its base, stoutly toothed distal to its 

 center, and less than half as long as the 

 slender plumose seta of the second seg- 

 ment. Total length, 1-1.2 mm. 



Male. — Reported by Steuer as dis- 

 covered in the material of the Valdivia 

 Expedition, but not yet described.*^ 



Remarks. — This species is the only 

 one in the present area that has spines 

 at the posterior corners of the fifth seg- 

 ment. The exceptional length and 

 slenderness of the plumose setae on the 

 second segments of the fifth legs are 

 also characteristic. It has never before been reported from our 

 American shores. 



ACARTIA TONSA Dana 



FiGUKE 109 



Acartia tonsa Dana, Proc. Amer. Acad. Arts and Sci., vol. 2, p. 26, 1849. — 

 Giesbrecht, Fauna und Flora des Golfes von Neapel, vol. 19, p. 508, pis. 30, 

 43, 1892. 



Occurrence. — Surface tow. Vineyard Sound, August, 1881 ; surface 

 tow. Woods Hole Harbor, September, 1881; surface tow off wharf 



Figure 108. — Acartia danae: a. 

 Female, dorsal (after Gies- 

 brecht) ; h, female, fifth legs 



«Zool. Anz., vol. 45, no. 9, p. 397, 1915. 



