56 BULLETIN 81, UNITED STATES NATIONAL MUSEUM. 



Eydatina ieptocerca Ehrenberg, Abh. Akad. Wiss. Berlin (for 1831), 1832, p. 128; 



dropped by Ehrenberg, Infusionsth., 1838, p. 418. 

 Eydatina terminalis Ehrenberg, Abh. Akad. Wiss. Berlin (for 1831), 1832, p. 128; 



dropped by Ehrenberg, Infusionsth., 1838, p. 418. 

 Eydatina tetraodon Schmarda, Neue wirbell. Thiere, 1859, vol. 1, p. 51, pi. 12, fig. 104. 



HYDRA Linnaeus. 



Eydra Linnaeus, Syst. Nat., ed. 10, 1758, p. 816. 



Type (by present designation). — Eydra polypus Linnseus; to Coelenterata. 



Eydra polypus Linnaeus, Syst. Nat., ed. 10, 1758, p. 816. 



HYDRIAS Ehrenberg. 



Eydrias Ehrenberg, only species Eydrias comigera, Ehrenberg, Hemprich and 

 Ehrenberg, Symb. Phys. Anim. Evert., 1831, Phytozoa, fol. d (second page), 

 pi. 2, II, Libyca, fig. 11; unrecognizable. 



HYPOPUS Bergendal. 



Eypopus Bergendal, Acta Univ. Lundensis, vol. 28, 1892, sect. 2, No. 4, p. 45; 

 not Eypopus Duges, 1834, Arachnidse. 



Genus KERATELLA Bory de St. Vincent. 



Keratella Bory de St. Vincent, Diet. Class. Hist. Nat., vol. 2, 1822, p. 470. 



Type (monotype). — Keratella quadrata {M.ul\er)= Brachionus quadratus Miiller. 



KERATELLA COCHLEARIS (Gosse). 



Anurxa cochlearis Gosse, Ann. Mag. Nat. Hist., ser. 2, vol. 8, 1851, p. 202, 



Anuraea tecta Gosse, Ann. Mag. Nat. Hist., ser. 2, vol. 8, 1851, p. 202. 



Anursea longistyla Schmarda, Neue wirbell. Thiere, 1859, vol. 1, p. 62, pi. 14, 



fig. 132. 

 Anurasa longispina Imhof, Zool. Anz., vol. 6, 1883, p. 470, fig. 1. 

 Anursea intermedia Imhof, Zool. Anz., vol. 8, 1885, p. 323. 

 Anursea tuberosa Imhof, Zool. Anz., vol. 8, 1885, p. 323. 



Anuraea cochlearis baltica Imhof, Zool. Anz., vol. 9, 1886, p. 614, nomen nudum, 

 Anuraea stipitata wartmanni Asper and Heuscher, Ber. St. Gallischen Nat. Gea. 



(for 1887-1888), 1889, p. 257, pi. 3, fig. 5. 

 Anursea cochlearis carinata Leyander, Medd. Soc. Fauna Flora Fennica, Haft 17, 



1892, p. 142. 

 Anuraea cochlearis pellucida Iwkof , Biol. Centralbl., vol. 12, 1892, 563, nomen nudum, 

 Anurasa cochlearis recurvispina Jagerskiold, Zool. Anz., vol. 17, 1894, p. 19, fig. 2. 

 Anuraea cochlearis stipitata Weber, Rev. Suisse Zool., vol. 5, 1898, p. 712, pi. 25, fig. 9. 

 Anuraea cochlearis macracantha Lauterborn, Zool. Anz., vol. 21, 1898, p. 598, fig. 1. 

 Anuraea cochlearis tecta Lauterborn, Zool. Anz., vol. 21, 1898, p. 599, fig. 3. 

 Anuraea cochlearis hispida Lauterborn, Zool. Anz., vol. 21, 1898, p. 600, fig. 4. 

 Anursea cochlearis irregularis Lauterborn, Zool. Anz., vol. 21, 1898, p. 601, fig. 5. 

 Anurasa cochlearis leptacantha Lauterborn, Verh. Nat.-Med. Ver. Heidelberg, n. ser., 



vol. 6, 1900, p. 428, pi. 1, fig. 24-25. _ 



Anursea tecta recurvispina Zernow, Izv. Obshch. Llub. lEst., Moskva, vol. 98, 1901, 



p. 30, pi. 4, fig. 8. _ 



Anuraea tecta cava Zernov, Izv. Obshch. Liub. lEst., Moskva, vol. 98, 1901, p. 31, 



pi. 4, fig. 29. 

 Anuraea cochlearis revoluta Brehm, Verh. Ges. Deutscher Naturf. u. Aerzte, vol. 81, 



1910, pt. 2, 1 Halfte, p. 191. 



