428 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



U.S.N.M. No. 64127. Honolulu. O. P. Jenkins. Length, 420 mm. Type of Dasy- 

 atis hawaiensis. 



DASYATIS AKAJEI (Muller and Henle) 



Trygon akajci (Biirger) Muller and Henle, Syst. Beschr. Plagiostomen, p. 165, 

 pi. 53, 1841 (type locality: Southwest coast of Japan). — Richardson, Ichth. 

 China Japan, p. 197, 1846 (copied). — Schlegel, in Siebold's Fauna Japonica, 

 Poiss., pt. 15, p. 308, 1850 (Japan).— Gray, List fish British Museum, p. 120, 

 1851 (reference). — Bleeker, Verh. Batav. Genootsch. (Japan), vol. 25, p. 22, 

 1853 (Japan) ; Act. Soc. Sci. Indo-Neerl., vol. 3, No. 10, p. 44, 1858 (Naga- 

 saki). — Sauvage, Bull. Soc. Philom. Paris, ser. 7, vol. 5, p. 104, 1881 

 (Swatow). — Soldatov and Lindberg, Bull. Pacific Sci. Fisher. Inst., vol. 5, 

 p. 24, 1930 (Far East Seas). 



Trygon {Trygon) akajei Dum^ril, Hist. Nat. Elasmobr., vol. 1, p. 604, 1865 

 (compiled). 



Trygon pastinaca var. akajei Martens, Preuss. Exped. Ost-Asien, vol. 1, p. 410, 

 1876 (Yokohama, Tschifu, Schott-miiller ) . 



Pastinaca akajei (Biirger) Mijller and Henle, Syst. Beschr. Plagiostomen, p. 

 165, 1841 (name in synonymy). 



Dasyatis akajei Rutter, Proc. Acad. Nat. Sci. Philadelphia, 1897, p. 56 

 (Swatow). — Jordan and Snyder, Annot. Zool. Japon., vol. 3, p. 42, 1901 

 (Nagasaki). — Jordan and Evermann, Proc. U. S. Nat. Mus., vol. 25, p. 319, 

 fig. 2, 1902 (Formosa). — Jordan and Fowler, Proc. U. S. Nat. Mus., vol. 

 26, p. 659, 1903 (Onomichi, Tokyo, Matsushima, Misaki, Wakanoura, 

 Hiroshima, Tsuruga, Hakata, Kawatana, Nagasaki). — Pietschmann, Sitz. 

 Ber. Akad. Wiss. Wien, math.-nat. Kl., vol. 117, pt. 1, p. 639, 1908 (Japan).— 

 Jordan and Richardson, Mem. Carnegie Mus., vol. 4, p. 164, fig. 2, 1909 

 (copied). — Fowler, Proc. Acad. Nat. Sci. Philadelphia, 1910, p. 473 (Onomi- 

 chi example). — Snyder, Proc. U. S. Nat. Mus., vol. 42, p. 401, 1912 (Otaru, 

 Shioyama, Tokyo, Misaki). — Jordan and Richardson, Mem. Carnegie Mus., 

 vol. 6, p. 6, fig. 4, 1913 (Fusan). — Izuka and Matsuura, Cat. Zool. Spec. 

 Tokyo Mus. Vertebrata, p. 186, 1920 (Jusangata). — Jordan and Hubbs, 

 Mem. Carnegie Mus., vol. 10, p. 114, 1925 (Miyuzu, Mikawa Bay). — Mori, 

 Journ. Pan Pacific Res. Inst., vol. 3, p. 3, 1928 (Fusan, Korea). — Fowler, 

 Proc. 4th (1929) Pacific Sci. Congr., Java, p. 505, 1930 (Japan).— Schmidt 

 and Lindberg, Bull. Acad. Sci. U. S. S. R., p. 1137, 1930 ( Tsuruga ) .—Fang 

 and Wang, Contr. Biol. Lab. Sci Soc. China, vol. 8, p. 272, fig. 25, 1932 

 (Chef 00). —Wang, Contr. Biol. Lab. Sci. Soc. China, vol. 9, p. Ill, 1933 

 (Chusan; Ningpo ; Yenting; Chinhai; Haimen; Wenchow). 



Dasyhatus akajei Garman, Mem. Mus. Comp. Zool., vol. 36, p. 394, 1913 (Japan; 

 China). — Schmidt, Trans. Pacific Comm. Acad. Sci. U. S. S. R., vol. 11, 

 p. 12, 1931 (Fusan).— Tan AKA, Jap. Fish. Life Colours, No. 32, 1933. 



? Trygon pastinaca (not Linnaeus) Gunther, Rep. Voy. Challenger, vol. 1, 

 p. 63, 1880 (Yokohama). 



Depth 12 to 173/5 to end of tail; head 6i/4 to 8; disk length IVk, 

 to ll^ in its width, 11/5 to 2 in tail. Snout 1% to 1% in head, forms 

 an obtuse angle with very slight point at tip; eye 51/4 to 7 in head, 

 3I/2 to 5I/2 in snout, 3I/2 to 4i/^ in interorbital ; dentary width 3 to 4 

 in head; teeth in 20 to 25 rows in jaws, rhombic, each with feeble 

 cusp; nostrils deep, simple, internarial equals dentary width; inter- 

 prbital 1% to 1% in head, nearly level. Gill openings equidistant, 



