38 



BULLETIISr 15 8, UNITED STATES NATIONAL MUSEUM 



obtuse; exopods of first 4 pairs of legs 3-segmented, endopods of 

 first legs 2-segmented, of the other 3 pairs 3-segmented; fi,fth legs 

 uniramose in both sexes. One species found here. 



PARACALANUS PARVUS (Claus) 

 FiGUEE 21 



Calanus parvus Ci^us, Die frei lebenden Copepoden, p. 173, pi. 26, figs. 10-14, 



18G3. 

 Paracalanus parvus, Saes, Crustacea of Norway, vol. 4, p. 17, pis. 8, 9, 1901. 



Occwn^ence. — Fifty males and females taken at the surface on 

 Georges Bank, September 14 and 15, 18T2; 40 males and females 

 from trawl wings at Stations 2194, 2195, 2204, Albatross^ southeast 

 of Marthas Vineyard. 



Distribution. — Helgoland (Claus) ; Mediterranean, Atlantic, and 

 Pacific (Giesbrecht, Cleve) ; North Sea (Mobius, Bourne) ; Norwegian 



coast (Sars) ; Gulf of Guinea (T. 

 Scott) ; Indian Ocean, Ked Sea, Ara- 

 bian Sea (Thompson and Scott) ; 

 Malay Archipelago, Arabian Sea, 

 Indian Ocean (Cleve) ; Skager Eak 

 (Cleve) ; southern Pacific (A. Scott) ; 

 Gulf stream south of Marthas Vine- 

 yard (Wheeler) ; Gulf of Maine 

 (Bigelow) ; Woods Hole Harbor 

 (Fish) ; Chesapeake Bay (Wilson). 



Color. — Body of female transpar- 

 ent, often with a bluish tinge, some- 

 times with a broad transverse band of 

 red across the thorax, again with a 

 variable extent of red pigment irreg- 

 ularly arranged. Male nearly always 

 a uniform light yellow, sometimes 

 with spots of red on the head and 

 third thoracic segment. 



Female. — Body short and stout; 

 head evenly rounded anteriorly; ros- 

 trum with 2 weak filaments; first antennae reaching the abdomen; 

 anterior and posterior surfaces of first basipod of each pair of legs 

 armed with hairs and spinules; second segment of second and third 

 endopods with an oblique row of spines on its posterior surface ; fifth 

 legs uniramose, 2-segmented, inner terminal seta as long as the distal 

 segment. Total length, 0.75-1 mm. 



Male. — Head thickened, with an obtuse keel along the dorsal sur- 

 face; fifth segment rounded at posterior corners; genital segment 



Figure 21. — Paracalanus parvus: a, 

 Male, dorsal ; b, fifth legs, male ; 

 c, fifth legs, female. (From W. M. 

 Wheeler) 



