1 6 Memoir Sears Foundation for Marine Research 



Univ. Mich., 105, 1922: 6 (descr.) ; Ribeiro, Fauna brasil., Peixes, 2 (i), Fasc. I, 1923: 4 (in part, 

 but B. flatae included because of loc.) ; Meel: and Hildebrand, Field Mus. Publ. Zool., 75 (i), 1923: I 

 (descr., but B. flaiae included because of loc.) ; Nichols, Ann. N. Y. Acad. Sci., 10 (2), 1929: 180, fig. I 

 (descr., distrib., Porto Rico) ; Jordan, Evermann and Clark, Rep. U.S. Comm. Fish. (1928), 2, 1930: 7 

 (West Indies); Pratt, Manual Common Invert. Anim., 1935: 757 (no. of myotomes, West Indies); 

 Longley and Hildebrand, Pap. Tortugas Lab., No. 34, 1941: I (listed for Tortugas, Florida); Fowler, 

 Monogr. Acad. nat. Sci. Philad., 7, 1945: 262 (Sanibel, Florida). 



Branchiosloma lanceolatum Giinther, Cat. Fish. Brit. Mus., 8, 1870: 513 (in part, specimens from Caribbean 

 Sea) ; Rep. Zool. Coll. "Alert," Brit. Mus., 18S4: 32 (in part, specimens from N. America) ; Jordan and 

 Gilbert, Bull. U.S. nat. Mus., 16, 1882: 867 (in part, specimens from east coast of N. America) ; Adams 

 and Kendall, Bull. U.S. Fish Comm., p, 1891: 292, 293, 298 (SW. Florida); Andrews, Stud. Biol. 

 Johns Hopk. Univ., 5, 1893: 239 (myotome formula of specimens from Chesapeake B.iy) ; not Limax 

 lanceo/alusTMas, 1 774. 



AmpAioxus cariiaeus Jordan and Gilbert, Proc. U.S. nat. Mus., /, 1879: 388; also, Smithson. misc. Coll., tp, 

 1880: 388 (Bird Shoal, N. Carolina) ; Kirkaldy, Quart. J. micr. Sci., 37, 1895: 313 (in part, descr., and 

 distrib., but B. fUtae also included); Lonnberg, Bronn's Klassen: 6, Abt. i, Buch I, 1904: 239 (descr., 

 distrib.). 



Branchiostoma lubricum Goode and Bean, Proc. U.S. nat. Mus., 2, 1880: 121 (E. Florida, name only). 



Amphioxus lanceolatus Rice, Amer. Nat., 14, 1880: i, 73, pi. 34, fig. i, 2 (habits, struct., develop.); not 

 Limax lanceolatus Pallas, 1 774. 



Branchiostoma lanceolata Gill, Proc. U.S. nat. Mus., 5, 1883: 515 (Atlant. coast of U.S.) ; not LiTuax lanceo- 

 latus Pallas, 1774. 



Amfhioxus (no specific name) Wright, Amer. Nat., 24, 1890: 1085 (Port Tampa, Florida) ; Andrews, Circ. 

 Johns Hopk. Univ., //, 1892: 75 (young stages recorded from Jamaica) ; Wells, Science, N.S. 64, 1926: 

 187 (ecology, habits, breeding season, age at sexual maturity and coll. methods, Florida). 



Branchiostoma caribkatum Tattersall, Trans. Lpool. Biol. Soc, 77, 1903: 241, 280 (cf. with B. lanceolatum 

 and B. belcheri) . 



Branchiostoma ftoridae Hubbs, Occ. Pap. Mus. Zool. Univ. Mich., 105, 1922: 7 (descr., Tampa and other 

 Florida loc); Breder, Field Bk. Mar. Fish. Atlant. Coast, 1929: 4 (Florida); Jordan, Evermann and 

 Clark, Rep. U.S. Comm. Fish. (1928), 2, 1930: 7 (Florida); Pratt, Manual Common Invert. Anim., 

 1935: 757 (no. of myotomes, gonads, Florida). 



Branchiostoma virginiae Hubbs, Occ. Pap. Mus. Zool. Univ. Mich., 103, 1922: 8 (descr., Chesapeake Bay); 

 Hildebrand and Schroeder, Bull. U.S. Bur. Fish., 4s, 1928: 42 (descr., habits, Chesapeake Bay) ; Breder, 

 Field Bk. Mar. Fish. Atlant. Coast, 1929: 4 (Chesapeake Bay) ; Jordan, Manual ^^ert. Anim. NE. U.S., 

 1929: 4 (descr., Chesapeake Bay to N. Carolina) ; Jordan, Evermann and Clark, Rep. U.S. Comm. Fish. 

 (1928), 2, 1930: 7 (Chesapeake Bay to Florida) ; Cowles, Bull. U.S. Bur. Fish., 46, 1 931: 367 (Chesa- 

 peake Bay); Pratt, Manual Common Invert. Anim., 1935: 757 (no. of myotomes, Chesapeake Bay to 

 Florida). 



Branchiostoma flatae Hubbs, 1922 



Figure 2 F 



Study Material. Thirty-six specimens, 31 to 5 1 mm. long, from the vicinity of Rio de 

 Janeiro and San Sebastiao I., Brazil, and oflF the mouth of the Rio de La Plata, Argentina 

 (Lat. 36° 43' S.} Long. 56° 23' W.), in the collection of the United States National 

 Museum. 



Distinctive Characters. B. flatae differs from the two eastern Atlantic species of this 

 genus {lanceolatum, africae), and from caribaeum as well, in having its anus considerably 

 posterior to the midpoint of the lower lobe of its caudal finj it differs further from cari- 

 baeum in that the lower lobe of its caudal fin originates considerably anterior to the origin 



