402 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



Dasibatis Agassiz, Nomencl. Zool. Pisces, p. 21, 1845.— (Garman) Jordan and 

 Gilbert, U. S. Nat. Mus. Bull. 16, p. 65, 1883. (Type, Raja pastinaca Lin- 

 naeus. ) 



Vroxis Rafinesque, Indice d'ittiologia siciliana, p. 48, 1810. (Type, Dasyatis ujo 

 Rafinesque, virtual monotype.) 



TryffonoMtus Blainville, Bull. Soc. Philom. Paris, vol. 8, p. 112, 1816. (Type, 

 Trygonohatus vulgaris Blainville=7Jaya pastinaca Linnaeus, designated by 

 Jordan and Evermann, Genera of Fishes, pt. 1, p. 94, 1917.) 



Trygonobatis Blainville, Faune Francjaise, Poiss., p. 35, 1825. (Type, Raja 

 pastinaca Linnaeus.) 



Trygon (Adansou) Cuvier, R^gne animal, vol. 2, p. 136, 1817. (Type, Raja 

 pastinaca Linnaeus, designated by Jordan and Evermann, Genera of Fishes, 

 pt. 1, p. 98, 1917. 



Pastinachus Rijppell, Atlas Reise nordl. Afrika, Fische, p. 82, 1828. (Type, 

 Raja sephen Forsk&l.) 



Pastinaca Swainson, Nat. Hist. Animals, Fishes, vol. 1, p. 172, 1838. (Type, Raja 

 sephen Forskfil.) 



Pastinacha Swainson, Nat. Hist. Animals, Fishes, vol. 2, pp. 192, 319, 1839. 

 (Type, Pastinacha oUvacea Swainson=i2a;a pastinaca Linnaeus, virtually 

 tautotypic. ) 



Himantura Muller and ELenle, Arch. Naturg., p. 400. 1837. (Atypic; type. 

 Raja uarnak ForskSl, designated by Garman, Mem. Mus. Comp. Zool., vol. 

 36, p. 375, 1913.) 



Himanturus Garman, Mem. Mus. Comp. Zool., vol. 36, p. 375 (392), 1913. (Type, 

 Raja uarnak ForskSl.) 



Hypolophus McJLLER and Henle, Arch Naturg., i). 400, 1837. (Atypic; type, 

 Raj» sephen ForskSl, selected as example by Bonaparte, Ann. Sci. Nat., 

 Bologna, vol. 2, p. 202, 1838. ) 



Hemitrygon MtJi-LEn and Henle, Mag. Nat. Hist., vol. 2, p. 90, 1838. (Type, 

 Trygon bennetti Miiller and Henle, monotypic.) 



Heliobatis Marsh, Amer. Journ. Sci. Arts, ser. 3, vol. 14, p. 256, 1877. (Type, 

 HeKobatis radians Marsh, monotypic.) (Fossil.) 



Xiphotrygon Cope, Amer. Nat., vol. 13, p. 333, 1879. (Type, Xiphotrygon acuti- 

 dens Cope, monotypic.) 



Brachioptera Geatzianow, Zool. Anz., 1906, p. 400. (Type, BracMoptera rhin- 

 oceros Gratzianov?, monotypic.) 



Pteroplatytrygon Fowler, Proc. Acad. Nat. Sci. Philadelphia, 1910, 474. (Type, 

 Trygon violaceum Bonaparte, orthotypic.) 



Amphotistins Garman, Mem. Mus. Comp. Zool., vol. 36, p. 375 (392), 1913. 

 (Type, Trygon sabina Lesueur, orthotypic.) 



Toshia Whitley, Rec. Australian Mus., vol. 19, No. 1, p. 60, 1933. (Type, 

 Dasyatis fluviorum Ogilby, orthotypic.) 



Bathytoshia Whitley, op. cit., p. 61. (Type, Dasyatis thetidis Whitley, ortho- 

 typic.) 



Disk partly quadrangular to partly circular. Tail elongate, whip- 

 like, with serrated caudal spine, with or without dermal fin folds 

 behind spine and without lateral folds on base. No rostral cartilages 

 supporting snout. Front copula of branchihyal cartilages segmented. 

 Skin smooth or with spines and tubercles. No rayed dorsal fins. 

 Pectorals wanting in front of skull. 



The following species is known only from the original imperfect 

 figure of Miiller and Henle : 



