84 BULLETIN 81, UNITED STATES NATIONAL MUSEUM. 



PLATYIAS new- genus. 



l)fpe (monotype). — Platyias qvutdricomis (Ehrenberg)= Noteus qtuidricornis Ehren- 

 berg. 



PLATYIAS QUADRICORNIS (Ehrenberg). 



Noteus qiiadricomis Ehrenberg, Abh. Akad. Wiss. Berlin (for 1831), 1832, p. 143, 



pi. 4, fig. 5. 

 Brachionus quadrwomis Dujardin, Hist. Nat. Zooph., 1841, p. 629. 

 ? Brachiontis intermedius Herrick, Bull. Denison Univ., vol. 1, 1885, p. 56. 

 Noteus stuhlmanni Collin, Deutsch-Ost-Afrika, vol. 4, No. 15, 1897, p. 8, fig. 9. 

 Noteus leydigii Haeckel, Kunstformen der Natur, Heft 4, 1900, pi. 32, fig. 7. 

 Noteus quadricomis hrevispinus Daday, Zoologica, Heft 44, 1905, p. 118, pi. 6, fig. 15. 



Genus PLEURETRA Bryee. 



Pleuretra Bryce, Journ. Quekett Micr. Club, ser. 2, vol. 11, 1910, p. 76. 



Type (by designation of Woodcock, Int. Cat. Sci. Lit., vol. 10, 1911, Zoology, 

 VI, p. 46). — Pleuretra alpium (Ehrenherg) = CaUidina alpiura Ehrenberg. 



PLEURETRA AFRICANA Murray. 



Pleuretra afrkana Murray, Ann. Transvaal Mus., vol. 3, 1911, p. 4, pi. 1, fig. 2. 



PLEURETRA ALPIUM (Ehrenberg). 



Callidina alpium Ehrenberg, Monatsber. Akad. Wiss. Berlin, 1853, p. 529. 

 Philodina alpium Murray, Trans. Royal Soc. Edinburgh, vol. 41, 1905, p. 383. 

 Pleuretra alpium Bryce, Journ. Quekett Micr. Club, ser. 2, vol. 11, 1910, p. 76. 



PLEURETRA BRYCEI (Weber). 



Callidina bryceiWEBER, Rev. Suisse Zool., vol. 5, 1898, p. 347, pi. 15, figs. 8-12. 

 Callidina cataracta Lord, Journ. Quekett Micr. Club, ser. 2, vol. 7, 1898, p. 77, pi. 7, 



fig. 2. 

 Philodina brycei Murray, Trans. Royal Soc. Edinburgh, vol. 41, 1905, p. 383. 

 Pleuretra brycei Bryce, Journ. Quekett Micr. Club, ser. 2, vol. 11, 1910, p. 76. 



PLEURETRA HUMEROSA (Murray). 



Philodina humerosa Murray, Trans. Royal Soc. Edinburgh, vol. 41, 1905, p. 382, 



pi. 4, fig. 4. 

 Pleuretra humerosa Bryce, Journ. Quekett Micr. Club, ser. 2, vol. 11, 1910, p. 76. 



PLEXJRETRA TRIANGULARIS Murray. 

 Pleuretra triangularis Murray, Bolivia and Peru, 1913, p. 23, text fig. 



Genus PLEUROTROCHA Ehrenberg. 



Pleurotrocha Ehrenberg, Abh. Akad. Wiss. Berlin, 1830, p. 46. 

 Type (monotype). — Pleurotrocha petromyzon Ehrenberg. 



PLEUROTROCHA CAUDATA (BHflnger). 



Proales caudata Bilfinger, Jahresh. Natiu-k. Wurttemburg, vol. 50, 1894, p. 46, pi. 2, 

 figs. 3, 4. 



Proales spinosus Lie-Pettersen, Bergens Mus. Aarbog, 1909, No. 15, p. 44; mis- 

 print? 



Pleurotrocha cavdata v. Hofsten, Ark. Zool., Stockholm, vol. 6, No. 1, 1909, p. 13. 



PLEUROTROCHA DAPHNICOLA (Thompson). 

 Proales daphnicola Thompson, Sci. Goss., vol. 28, 1892, p. 220, fig. 



