NO. 2164. REVISION OP BOTATORIAN GENERA— EARRING. 537 



Lepadella apsida appears to be rare; only a few specimens were 

 found in each collection. It does not bear any close resemblance to 

 other members of the genus and is easy enough to identify when 

 found, but this is a matter of some difficulty, as it shares with 

 L. triptera the distinction of being the smallest Lepadellid, and it is, 

 in addition, excessively transparent. 



2. LEPADELLA OVALIS (Mtiller). 



Plate 89, figs. 4-10. 



Brachionus ovalis Mullee, Anim. Infus., 1786, p. 345, pi. 49, figs. 1-3. 



Mytilina lepidura Bory de St. Vincent, Class. Anim. Micr., 1826, p. 87= 

 Brachionus ovalis renamed. 



Lepadella ovalis Ehrenberg, Abh. Akad. Wiss., Berlin, 1830, p. 85, pi. 7, fig. 4; 

 Infusionsth., 1838, p. 457, pi. 57, fig. 1. 



Metopidia lepadella Ehrenberg, Abh. Akad. Wiss.. Berlin (for 1831), 1832, p. 

 136; Infusionsth., 1838, p. 477, pi. 59,, fig. 10.— v. Hofsten, Ark. Zool., Stock- 

 holm, vol. 6, No. 1; 1909, p. 63, text figs., part. — Dieffenbach, Stisswasserfauna 

 Deutschlands, pt. 14, 1912, p. 192, text fig., part. 



Squamella oblonga Ehrenberg, Abh. Akad. Wiss., Berlin (for 1833), 1834, p. 

 220; Infusionsth., 1838, p. 480, pi. 59, fig. 17. 



Squamella bractea Ehrenberg, Infusionsth., 1838, p. 480, pi. 59, fig. 16; not 

 Brachionus bractea Mtjller, 1786. 



Lepadella oblonga Dujardin, Hist. Nat. Zooph., 1841, p. 633. 



Lepadella rotundata Dujardin, Hist. Nat. Zooph., 1841, p. 633. 



Metopidia solidus Gosse, Ann. Mag. Nat. Hist., ser. 2, vol. 8, 1851, p. 201. — Hud 

 SON and Gosse, Rotifera, 1886, vol. 2, p. 106, pi. 25, fig. 11.— Skorikov 

 Trav. Soc. Nat. Kharkow, vol. 30, 1896, p. 326, pi. 7, fig. 22.— Weber, Rev 

 Suisse Zool., vol. 5, 1898, p. 632, pi. 22, figs. 25-27.— Wesche, Journ. Quekett 

 Mcr. Clul), ser. 2, vol. 8, 1901, p. 124, text fig.; Journ. Quekett IVIicr. Club, ser, 

 2, vol. 8, 1902, p. 324, footnote, pi. 18, fig. 5c?. — Lie-Pettersen, Troms0 Mus, 

 Aarsh., vol. 33, 1911, p. 67, text figs.— Lucks, Rotatorienfauna Westpreussens 

 1912, p. 120, text fig. 



fStephanops ovalis Schmarda, Neue wirbell. Thiere, vol. 1, pt. 1, 1859, p. 60, pi 

 14, fig. 127. 



Hexastemma melanoglena Schmarda, Neue wirbell. Thiere, vol. 1, pt. 1, 1859, p 

 60, pi. 14, fig. 129. 



Metopidia ovalis Hudson and Gosse, Rotifera, Suppl., 1889, p. 46, pi. 34, fig. 2 



Metopidia torquata Anderson, Journ. Asiatic Soc. Bengal, vol. 58, 1889, pt. 2, p 

 356, pi. 21, fig. 9. 



? Metopidia bractea Iroso, Atti R. 1st. Incorr. Napoli, vol. 64 (for 1912), 1913, p. 

 475; not Brachionus bractea Muller, 1786. 



Lepadella solidus Harring, Proc. U. S. Nat. Mus., vol. 47, 1914, p. 549. 



The outline of the lorica varies from the broadly ovate form shown 

 in figm-e 6 to subcircular, as figm-e 10; its width is but little less than 

 the length. The dorsal plate is only slightly convex and, as the 

 ventral plate is nearly flat, the actual volume of the body is quite 

 small,- the dorso-ventral depth is about one-fifth of the length of the 

 lorica. The two plates are joined for some distance from the edge 

 and the internal termination of this border is slightly irregular and 

 minutely crenulate, the "milled edge" of Gosse. 



