Table of Contents ix 



Dasyatis americana 34^ 



Dasyatis centroura 3^2 



Dasyatis geijskesi 363 



D asyatis guttata 365 



Dasyatis sabina 370 



Dasyatis say 378 



Genus Himantura 389 



Himantura schmardae 390 



Family Gymnuridae 395 



Genus Gymnura 396 



Gymnura altavela 399 



Gymnura micrura 408 



Family Urolophidae 416 



Genus Urolophus 418 



Urolophus jamaicensis 420 



Genus Urotrygon 427 



Urotrygon microphthalmum 428 



Urotrygon venezuelae 430 



Family Myliobatidae 433 



Genus Myliobatis 435 



Myliobatis freminvillii 438 



Myliobatis goodei 446 



Genus Aetobatus 451 



Aetobatus narinari 453 



Family Rhinopteridae 465 



Genus Rhinoptera 465 



Rhinoptera bonasus 469 



Rhinoptera brasiliensis 477 



Family Mobulidae 480 



Genus Mobula 486 



Mobula hypostoma 488 



Mobula mobular 495 



Genus Ceratobatis 497 



Ceratobatis robertsii 497 



Genus Manta 500 



Manta birostris 502 



CHIMAEROIDS By Henry B. Bigelow and William C. Schroeder 515 



General Discussion 515 



Subclass Holocephali 515 



Order Chimaerae 516 



Family Chimaeridae 523 



