44 6 Memoir Sears Foundation for Marine Research 



Fraser, Giant Fishes, 1937: 77 (listed, C. Cod to Brazil); Breder, Bull. N. Y. zool. Soc, 41, 1938: 

 28 (listed. New York Harbor). 



Myliobatis iispinosus Storer, Proc. Boston Soc. nat. Hist., I, 1842: 53 (Holmes Hole, Mass.); Boston J. nat. 

 Hist., 4, 1842: 188 (same specimen as the foregoing); Ayres, Boston J. nat. Hist., 4, 1843: 29, pi. 13, 

 fig. I (descr., ill., Long Island, New York); Gill, Proc. Acad. nat. Sci. Philad., Addend., 1861 : 62 (listed, 

 E. Coast N..'\raer.); Dumeril, Hist. Nat. Poiss., I, 1865: 637 (descr., after Ayres 1843); Giinther, 

 Cat. Fish. Brit. Mus., 8, 1870: 488, footnote i (ref to Storer 1842). 



Myliobatis acuta Ayres, Proc. Boston Soc. nat. Hist., j, 1842: 65 (diagn., color. Long Island, New York); 

 Linsley, Amer. J. Sci., 47, 1844: 79 (listed. Long Island, New York); Storer, Mem. Amer. Acad. Arts 

 Sci., N. S. 2, 1846: 514 (diagn., size, Mass. and Conn, by ref. to Storer and Ayres); Mem. Amer. Acad. 

 Arts Sci., N. S. 9, 1867: 245, pi. 39, fig. 4; also, Fishes Mass., 1867: 269, pi. 39, fig. 4 (descr., color, 

 ill.. Holmes Hole, Mass.); Gunther, Cat. Fish. Brit. Mus., 8, 1870: 488, footnote i (ref to Storer and 

 Ayres). 



Aetobatus freminviUii Jordan, Evermann and Clark, Rep. U. S. Comm. Fish. (1928), 2, 1930: 3 1 (listed, C. Cod 

 to Brazil). 



Holorhlnus freminvillei Fowler, Arqu. Zool. Estad. Sao Paulo, J, 1942: 132 (listed, Rio de Janeiro). 



Probable References: 



Aetobatis freminvillei Evermann and Kendall, Bull. U. S. Fish Comm., 12, 1894: 96 (listed, Galveston, Texas). 

 Myliobatis freminviUii Borodin, Bull. Vanderbilt Oceanogr. (Mar.) Mus., I, 1928: 5 (listed, W. Indies); Bel- 

 tran, List. Feces Mexicanos, 1934 (listed, Mexico; not seen). 



Myliobatis goodei Garman 1885 

 Figure 104 



Study Material. Five females, 270-990 mm wide, from Uruguay and from Rio 

 Grande do Sul and Rio de Janeiro, Brazil, and Charleston, South Carolina, in U.S. 

 National Museum and Harvard Museum of Comparative Zoology. 



Distinctive Characters. Myliobatis goodei differs from M. freminviUii (the only other 

 western Atlantic Ray with which it could be confused) in the relatively broader separa- 

 tion between the inner ends of the more posterior pairs of gill openings," in its relatively 

 smaller dorsal fin," in the position of the dorsal fin farther rearward, in the more broadly 

 rounded outer corners of its pectorals (cf. Fig. 104 with 102) and the somewhat more 

 obtusely blunted posterior corners. Also, the width of the trunk between the axils of 

 the pectorals is considerably greater in medium-sized and large examples of M. goodei 

 than in M. freminviUii,*^ though it is doubtful whether there is any significant difference 

 in this respect between small specimens of the two species. The subrostral fin is usually 

 somewhat shorter in M. goodei than in M. freminviUii, at least in females, but no sharp 

 line can be drawn between the two in this respect; nor is it known whether this difference 

 applies to the opposite sex, since males of M. goodei have not been seen. 



Description. Proportional dimensions in per cent of extreme breadth of disc. Female, 



40. Inner ends of fifth pair of gill openings separated by a distance more than 1.5 times as great as that between ex- 

 posed ends of nostrils in M. goodei, but less than 1.25 times in M.fremin'villii. 



41. Base of dorsal fin only 0.6-0.8 as long as distance between exposed ends of nostrils in M. goodei, but 0.9-1.0 times 

 in M.fremin'villii. 



42. Wider than between the inner ends of the fifth pair of gill openings in M. goodei but considerably narrower than 

 that in M.fremin'villii. 



