40 BULLETIN 81, UNITED STATES NATIONAL MUSEUM. 



DIURELLA HELMINTHODES (Gosse). 



Rattulus helminthodes Gosse, Hudson and Gosse, Rotifera, 1886, vol. 2, p 65 pi 20 

 fig. 17. 



Diurella helminthodes Jennings, Bull. U. S. Fish Comm., vol. 22 (for 1902), 1903, 

 p. 320, pi. 14, fig. 122. 



DIURELLA INSIGNIS Herrick. 

 Diurella insignis Hehrick, Bull. Denison Univ., vol. 1, 1885, p. 50, pi. 4, fig. 6. 

 DIURELLA INTERMEDIA (Stenroos). 



Coelopus intermedins Stenroos, Acta Soc. Fauna Flora Fennica, vol. 17, No. 1, 1898, 



p. 150, pi. 2, fig. 10. 

 Diurella intermedia Jennings, Bull. U. S. Fish Comm., vol. 22 (for 1902), 1903, p. 310, 



pi. 13, figs. 108-110. 



DIURELLA PORCELLUS (Gosse). 



Monocerca porcellus Gosse, Ann. Mag. Nat. Hist., ser. 2, vol. 8, 1851, p. 199. 

 Coelopus jporcellus Gosse, Hudson and Gosse, Rotifera, 1886, vol. 2, p. 67, pi. 20, fig. 18. 

 Type (by present designation) of genus Ccelopus Gosse, 1886; not Coelopus Becker, 

 1907, Insecta. 

 Acanthodactylus tigris Tessin, Arch. Naturg. Mecklenburg, vol. 43, 1890, p. 153, pi. 1, 



fig. 13. 

 Diurella porcellus Jennings, Bull. U. S. Fish Comm., vol. 22 (for 1902), 1903, p. 312, 

 pi. 2, figs. 19-23. 



DIURELLA ROUSSELETI (Voigt). 



Ccelopus rousseleti Voigt, Zool. Anz., vol. 25, 1902, p. 38. 



Diurella rousseleti Jennings, Bull. U. S. Fish Comm., vol. 22 (for 1902), 1903, p. 315, 



pi. 4, figs. 37-39. 

 Mastigocerca minima Skorikov, Ann. Mus. Zool. St. Petersburg, vol. 8, 1903, p. XXI. 



DIURELLA SEJUNCTIPES (Gosse). 



Eattuliis sejunctipes Gosse, Hudson and Gosse, Rotifera, 1886, vol. 2, p. 66, pi. 20, 



fig. 15. 

 Diurella sejunctipes Jennings, Bull. U. S. Fish Comm., vol. 22 (for 1902), 1903, p. 319, 



pi. 14, figs. 120, 121. 



This species should probably be dropped; Gosse's description and 

 figure are insufficient for determination, and the animal described 

 and figured by Stenroos (see Jennings) was apparent!}^ Diurella 

 hrachyura (Gosse), or rather, no details are given that would enable 

 others to differentiate the two. 



DIURELLA STYLATA Eylerth. 



Diurella siylata Eyferth, Einf. Lebensf., 1878, p. 85, pi. 5, fig. 23. 



Coelopus similis Wierzejski, Bull. Acad. Sci. Cracovie (for 1892), 1893, p. 406. 



Rattulus hicomis Western, Joum. Quekett Micr. Club, ser. 2, vol. 5, 1893, p. 159, 



pi. 9, fig. 4. 

 Mastigocerca birostris Minkiewicz, Zool. Anz., vol. 23, 1900, p. 623, fig. III6. 

 Mastigocerca wolgensis Meissner, Conipt. Rend. Stat. Biol, du Volga (for 1901), 1902, 



p. 26, pi. 10, figs. 6-8. 

 Mastigocerca hetcrostyla Daday, Sitzungsber. Akad. Wiss. Wien, vol. 112, 1903, Abt. 



1, p. 144, pi. 1, fig. 4. 

 Mastigocerca bland Linder, Rev. Suisse Zool., vol. 12, 1904, p. 238, pi. 4, fig. 7. 



