NO. 2164. REVISION OF ROTATORIAN GENERA— EARRING. 539 



text, as these are frequently unreliable and at times impossible, the 

 length of Lepadella emarginata, for instance, being given as ^ line, 

 or 46 fx. His figures of the species here concerned are all stated to 

 be drawn to a uniform magnification of 300 diameters, and with this 

 as a guide, as well as the work of subsequent investigators, there can 

 be little doubt of their identity. Miiller's figure of BracMonus ovalis 

 is not especially good, but the same criticism applies to a great many 

 of the more recent illustrations and, as the name was accepted by 

 Ehrenberg, there appears to be no reason for rejecting it now. 



3. LEPADELLA PATELLA (MttUer). 



Plate 90, figs. 1-12. 



BracMonus patella Muller, Verm. Terr. Fluv., vol. 1, pt. 1, 1773, p. 130; Anim. 



Infus., 1786, p. 341, pi. 48, figs. 15-19.— Schrank, Fauna Boica, vol. 3, pt. 2, 



1803, p. 132. 

 Lepadella patella Bory de St. Vincent, Class. Anim. Micr., 1826, p. 86. 

 Lepadella emarginata Ehrenberg, Hemprich and Ehrenberg, Symb.Phys. Anim. 



Evert., 1831 (?1832), Phytozoa, fol. d (third page), pi. 2, Sinaitica, fig. 19; 



Infusionsth., 1838, p. 458, pi. 57, fig. 2. 

 fSqunmella quadridentata Schmarda, Neue wirbell. Thiere, vol. 1, pt. 1, 1859, 



p. 60, pi. 14, fig. 128. 

 Squamella bractea Eckstein, Zeitschr. wiss. Zool., vol. 39, 1883, p. 388. — France, 



Term. Fiiz., vol. 17, 1894, pp. 121, 176, pi. 6; not BracMonus bractea Muller, 1786. 

 Squamella oblonga Eckstein, Zeitschr. wiss. Zool., vol. 39, 1883, p. 391; not of 



Ehrenberg, 1834. 

 Metopidia lepadella Hudson and Gosse, Rotifera, 1886, vol. 2, p. 106, pi. 25, fig. 



6. — Plate, Jenaische Zeitschr. Naturw., vol. 19, 1886, p. 59. — Tessin, Arch. 



Naturg. Mecklenburg, vol. 43, 1890, p. 160, pi. 2, fig. 18.— Levander, Acta 



Soc. Fauna et Flora Fennica, vol. 12, No. 3, 1894, p. 54, pi. 3, fig. 38.— Skori- 



Kov, Trav. Soc. Nat. Kharkow, vol. 30, 1896, p. 325.— Stenroos, Acta Soc. 



Fauna et Flora Fennica, vol. 17, No. 1, 1898, p. 167, pi. 3, fig. 3.— Voronkov, 



Trudy Hidrobiol. Stantsii Glubokom Oz., vol. 2, 1907, p. 289.— v. Hofsten, 



Ark. Zool., Stockholm, vol. 6, No. 1, 1909, p. 63, text figs., part.— Dieffen- 



BACH, Siisswasserfauna Deutschlands, pt. 14, 1912, p. 192, text fig., part; not 



Metopidia lepadella of Ehrenberg, 1832. 

 Metopidia bractea Hudson and Gosse, Rotifera, 1886, vol. 2, p. 109. — Skorikov, 



Trav. Soc. Nat. Kharkow, vol. 30, 1896, p. 329; not BracMonus bractea Muller, 



1786. 

 Metopidia elliptica Turner, Bull. Denison Univ., vol. 6, 1892, p. 62, pi. 1, fig. 8. 

 Metopidia dentata Turner, Bull. Denison Univ., vol. 6, 1892, p. 63, pi. 1, fig. 9. 

 fMonostyla tentaculata Cosmovici, Naturaliste (Paris), vol. 14, 1892, p. 70; Anal. 



Acad. Rom., ser. 2, vol. 28, 1906, p. 44, text fig. 

 Metopidia parvula Bryce, Journ. Quekett Mcr. Club, ser. 2, vol. 5, 1893, p. 284. 

 Metopidia lepadella collaris Levander, Acta Soc. Fauna et Flora Fennica, vol. 12, 



No. 3, 1894, p. 54, pi. 3, fig. 39. 

 Metopidia ovalis Skorikov, Trav. Soc. Nat. Kharkow, vol. 30, 1896, p. 328, pi. 7, 



fig. 21. 

 Metopidia collaris Stokes, Ann. Mag. Nat. Hist., ser. 6, vol. 18, 1896, p. 19, pi. 7, 



figs. 3, 4. 

 Metopidia collaris similis Stokes, Ann. Mag. Nat. Hist., ser. 6, vol. 18, 1896, p. 20, 



pi. 7, fig. 5.— Runnstrom, Zool. Anz., vol. 34, 1909, p. 273, text fig. 



