16 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 121 



on four different occasions in the Western Atlantic. It should also be 

 noted as having been collected from Lamna nasus as well. 



Pandarus sinuatus Say, 1817 



Figures 67, 68 



Pandarus sinuatus Say, 1817, p. 436. — Milne-Edwards, 1840, p. 470. — Smith, 

 1874, p. 283.— Rathbun, 1886, p. 310.— McClendon, 1906, p. 44; 1907, 

 p. 114; 1910, p. 229.— Wilson, 1907, p. 417; 1932, p. 437.— Bere, 1936, p. 

 595.— Carvalho, 1940, p. 283; 1945, p. Ill; 1951, p. 139.— Pearse, 1952a, 

 p. 27; 1952b, p. 213.— Causey, 1953, p. 12; 1955, p. 6. 



Pandarus affinis Beneden, 1892a, p. 224.— Bassett-Smith, 1899, p. 467.— Wilson, 

 1907, p. 394.— Capart, 1953, p. 660. 



Specimens studied. — Two collections from Carcharinus leucas 

 Miiller and Henle from Sarasota, Fla. From the same locaUty a single 

 collection from Negaprion brevirostris (Poey). In addition to these, I 

 examined 88 collections from the U.S. National Museum collected at 

 various localities along the eastern coast of the United States. These 

 collections are from a wide variety of shark hosts generally restricted 

 to inshore species. 



Female. — Body form as in figure 67. Total length (based on an 

 average of 5 specimens) 6.5 mm. Greatest width (measured at widest 

 part of cephalon) 3.2 mm. Appendages of this species inseparable 

 from those of P. floridanus except last segment of exopod of leg 2 bears 

 10 spines instead of 9 as in P. floridanus. Since a description of ap- 

 pendages of this species would only duplicate that of P. floridanus , 

 none will be given here. Only those features that separate it from 

 P. floridanus will be emphasized. 



Dorsal plate of segment 2 extending only to anterior third of plate 

 of segment 4. Abdominal plate small and rounded, only about as long 

 as exposed caudal ramus (see table 1). Color dark brown to black 

 with eye spots fused and continuous with median unpigmented line 

 from posterior edge of eye spots to posterior margin of cephalon. 

 Young females (fig. 68 )with pigment first developing in lateral areas 

 of cephalon. 



Male. — As in P. floridanus. 



Discussion. — P. sinatus is apparently found only on sharks inhab- 

 iting coastal waters of the western North Atlantic Ocean. It occurs 

 only on the body surface of the host usually in clusters on the fins as 

 do other members of the genus. It is closely related to P. floridanus 

 but is easily separated from it on the basis of the above characteristics. 

 Superficially, this copepod also may be confused with P. bicolor because 

 of the pigmentation, but it can be easily distinguished from this species 

 on the basis of the thoracic plates. The dorsal plates of segment 2 of 

 P. bicolor do not extend beyond the plate of segment 3. 



