60 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.60 



In 1853 Beneden^' published a description of a parasitic copepod 

 which he claimed as a new genus and named Pagodina. It is the 

 same as Hisso's genus and hence becomes a synonym of Netnesis. 



NEMESIS CARCHARIAE-GLAUCI (Hesse). 



Pagodina carchariae-glauci Hesse, Ann, Sci. Nat., Zool., vol. 16, 1883, p. 13, 

 pi. 12, figs. 12-19. 



Remarks. — The female of this species was described and figured 

 by Hesse, and recorded as having been found on the gills of Car- 

 charias glaucus. This is one of the hosts of Nemesis rohusta^ and 

 that circumstance would suggest a careful comparison of the two 

 species to make sure that Hesse was justified in separating them. 

 Although such a comparison is difficult owing to the meagerness of 

 the descriptions, at the same time it reveals so many radical differ- 

 ences that it does not seem possible for the two species to be identical. 



The distinguishing characters of the present species appear to be 

 the pointed anterior end of the cephalothorax and its squarely trun- 

 cated and scalloped posterior margin; the slenderness of the second 

 antennae and the weakness of their terminal claws; the fact that 

 the abdomen is fully as wide as the genital segment and only two- 

 jointed; the three-jointed exopods and two-jointed endopods of the 

 swimming legs, according to Hesse's text. In figure 19, however, he 

 portrays the first two pairs of legs ; the first pair have three-jointed 

 exopods and two- jointed endopods, as the text calls for, but in the 

 second pair both rami are one- jointed. It would seem as if some of 

 these differences must be real, and if so they would establish the 

 validity of the species. 



NEMESIS ATLANTICA, new species. 



Plate 9, figs. 61-69 ; plate 10, figs, 70-74. 



Host and record of specimens. — Thirty specimens, including both 

 sexes, were taken from the gills of the sharp-nosed shark, Scoliodon 

 terrae-novae., at Beaufort, North Carolina, July 26, 1905. A female 

 with an attached male has been selected to serve as the type of the 

 species, with Cat. No, 54051, U.S.N.M. The remaining specimens be- 

 come paratypes with Cat, No. 32814, U.S.N.M, 



Sixty specimens, including both sexes and development stages, 

 were obtained by Dr. M. T, Thompson from the gills of the thresher 

 shark, Alopias vulpes, at Woods Hole, July 20, 1902. The adult 

 females, 30 in number, have been given Cat, No. 39564, U.S.N.M.; 

 the males and young have been separated, with Cat. No. 39565, 

 U.S.N.M. These specimens were especially numerous on the first 

 pair of gills, the larger females with egg strings near the tips of the 

 gill filaments, the males and undeveloped females nearer the bases. 



» Bull. Acad. Roy. Belgique. vol. 20, p. 482. 



