244 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 117 



Male. — Not found in our collections. 



Distribution. — A circumtropical species. Along the Atlantic 

 coast of the United States it is a common offshore species in waters 

 south of Cape Hatteras (unpublished data from M/V Theodore N. Gill 

 collections) . North of Cape Hatteras it is present in the Gulf Stream 

 (Cleve, 1900; Grice and Hart, 1962) but not in coastal or shelf water 

 since it was not reported by Bigelow and Sears (1939), Deevey (1952a, 

 1952b, 1956, 1960), or Cronin, Daiber, and Hulbert (1962). In the 

 South Atlantic it occurs south of the latitude of Rio de Janeiro (Farran, 

 1929; Bjornberg, 1963). Cleve (1900) recorded it from several 

 localities along South America between Trinidad and French Guiana. 

 Throughout its range it is found typically in offshore rather than 

 coastal waters. In the Puerto Rican collections it is very rare in 

 inshore waters, but fairly common offshore. 



Paracalanus crassirostris F. Dahl 



Figures 2f-n, 3a 



Paracalanus crassirostris F. Dahl, 1894a, p. 12, pi. 1, figs. 27, 28 — Thompson and 

 Scott, 1903, p. 243.— Giesbrecht and Schmeil, 1898, p. 24.— Sewell, 1929, 

 pp. 72-76, fig. 27.— Pesta, 1916, p. 4.— Gurney, 1927, pp. 144-147, figs. 

 16B-D, 1 7 A-E.— Deevey, 1948, pp. 21-22; 1952a, p. 92; 1952b, p. 144, fig. 

 13; 1956, p. 134; 1960, p. 29.— Davis, 1950, p. 93 (table) .-Davis and Williams, 

 1950, pp. 521, 523 (tables).— Grice, 1956, p. 62 (ftn.) ; 1960a, p. 223.— Breuer, 

 1962, p. 167.— Jeflfries, 1962, passim.— Bjornberg, 1963, p. 28.— Cuzon du 

 Rest, 1963, passim, 



Paracalanus crassirostris f. typica Friichtl, 1923, p. 456; 1924, pp. 36-39. 



Female. — Length 0.47-0.50 mm. Prosome : urosome = 3.2-3.5. 

 Head rather low; forehead somewhat produced; rostral filaments 

 thick and blunt, not fihform. Innermost caudal seta more than twice 

 as long as caudal ramus. Al nearly as long as body. Third lobe of 

 Bl of Mxp with 2 setae. P2-P4 as in figures 2j-Z; surface armature 

 poorly developed; no surface spinules on Bl and B2. P5 short; 

 terminal setae short and stout. 



Male. — Length 0.35-0.37 mm. Prosome : urosome = 3.2. Prosome 

 relatively shorter than in female; forehead less produced; rostrum 

 triangular. Al about as long as prosome, with fewer segments than 

 in female. P1-P4 as in female. P5 with short terminal setae. 



Distribution. — Mouth of Tocantin River, Brazil (Dahl); Brazil 

 coast (Bjornberg) ; Indian Ocean, several localities (Friichtl, Sewell, 

 Thompson and Scott); Suez Canal (Gurney); Tisbury Great Pond, 

 Martha's Vineyard; Long Island Sound; Delaware Bay (Deevey); 

 Raritan Bay (Jeffries); Florida coast (Davis, Davis and Williams, 

 Grice) ; Louisiana (Cuzon du Rest) . The species appears to be limited 

 mainly to tropical and subtropical coastal waters, frequently in 



