82 



BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM 



endopods 3 -segmented ; fifth legs lacking in the female, present and 

 biramose in the male. One species found here. 



SCOLECITHRIX DANAE (Lubbock) 

 FiGUEE 56 



Undina danae Lubbock, Trans. Ent. Soc. London, new ser., vol. 4, p. 21, pi. 4, 



1856. 

 Scolecithrix danae Giesbeecht, Fauna und Flora des Golfes von Neapel, voL 



19, p. 265, pis. 13, 37, 1892. 



Occurrence. — Four females in surface tow on Georges Bank, 1874 ; 

 6 males and females in surface tow. Station 2210, Albatross^ south- 

 west of Gay Head; 7 females 

 from trawl wings, Station 

 2195, Albatross^ south of 

 Nantucket. 



Distnhution. — North At- 

 lantic (Lubbock, T. Scott, 

 Cleve) ; New Holland and 

 Japan (Brady) ; tropical Pa- 

 cific (Giesbrecht) ; Canary 

 Islands, Malta (Thompson) ; 

 Indian Ocean (Thompson and 

 Scott) ; Malay Archipelago 

 (A. Scott) ; California coast 

 (Esterly) ; Mediterranean 

 (Giesbrecht) ; Gulf of Maine 

 (Bigelow). 



Color. — Body transparent 

 and colorless except the fol- 

 lowing: Intestine, yellowish 

 or reddish brown, with the same color appearing in scattered spots 

 on the swimming legs and genital segment; flecks of red, irregularly 

 arranged, appear on the dorsal surface of the thoracic segments ; eye, 

 bright ruby red. (Rathbun.) 



Ferniale. — Head without a crest; genital segment with a shovel- 

 shaped protuberance on its ventral surface; abdominal segments 

 wider than long; first antennae just reaching the genital segment; 

 exopod of second antenna 5-segmented, twice as long as the endopod, 

 the latter with eiglit setae. Total length, 2-2.25 mm. 



Male. — A little smaller than the female; genital segment smooth 

 ventrally; mouth parts not modified; right fifth leg uniramose, 5- 

 segmented, the basipods distally and the exopod proximally swollen, 

 end segment very short; basipods of left leg elongate cylindrical, 

 reaching beyond the third segment of the right leg, exopod 3-seg- 



FiGDRE 56. — Scolecithrix danae: a. Female, dor- 

 sal ; ft, male, fifth legs (after Giesbrecht). 



