46 BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM 



Genus AETIDEOPSIS G. O. Sars, 1903 



Anterior portion of head much narrowed, with the frontal margin 

 flattened on each side; fifth segment distinctly separated from the 

 fourth, its posterior corners produced into slender spines, which 

 scarcely reach the center of the genital segment; urosome 4-seg- 

 mented. ExojDods of first four pairs of legs 3-segmented; first 

 endopod 1-segmented, second endopod 2-segmented, third and fourth 

 endopods 3-segmented; fifth legs lacking in female, male unknown. 

 One species found here. 



AETIDEOPSIS ROSTRATA G. O. Sars 



FiGUBB 27 



Aetideopsis rostrata Sars, Crustacea of Norway, vol. 4, p. 160, suppl. pis. 4, 5, 

 1903. 



Occurrence. — A single female from the trawl wings. Station 1089, 

 Fish Haxoh^ northeast of Cape Cod Light. 



Distribution. — B e t w e e n Jan Mayen 

 and Finmark (Sars) ; North Sea (Wol- 

 fenden) ; west coast of Ireland (Farran) ; 

 Arctic Ocean (Koefoed and Damas) ; 

 between Iceland and Greenland (With) : 

 Malaysia (A. Scott). 



Color. — Sars made the statement: 

 " Color not yet ascertained," and this is 

 still true, since Rathbun made no notes 

 on this single specimen. 



Female. — Body elongate-obovate ; ante- 

 rior head widened through the mouth and 

 abruptly narrowed in front of this, the 

 forehead triangular. First antennae 

 reaching posterior margin of first ab- 

 dominal segment; urosome one-third as 

 long as metasome; genital segment pro- 

 truding slightly ventrally. Apical spines 

 on the exopods of the first four pairs of 

 Total length, 4.4 mm. 



FiGDRK 27. — Aetideopsis rostrata: 

 a. Female, dorsal ; 6, maxilll- 

 ped. (After Sars) 



legs densely pectinated 



Male. — Unknown. 



Remarks. — The distinct separation of the fourth and fifth seg- 

 ments and the much shorter spines at the posterior corners of the 

 latter distinguish this genus from Aetideus. It has never before been 

 reported from the American coast. 



