NO. 2164. REVISION OF ROTATORIAN GENERA— BARRING. 553 



the same transverse plane, the left toe is almost directly under the 

 right toe. 



Total length, 134 /x; length of lorica, 88 n, width at lateral angles, 

 90 jj,; width of anterior margin, 27 m; depth of dorsal sinus, 10 jw, of 

 ventral sinus, 14 ^5 length of foot groove, 28 /x, width, 18 m; length of 

 foot, 32 ix, of posterior joint, 18 m; length of right toe, 32 /x, of left 

 toe, 26 ju; depth of body, 36 m- 



The material upon which this description is based was given to 

 the writer by Mr. Murray; it was collected in a pond at Sydney, 

 Australia. As stated by Murray, the animal figured by v. Hofsten 

 and copied by Dieffenbach under the name of Metopidia rJiomboides 

 appears to be the same species; v. Hofsten found a single specimen 

 in the ''Mastermyr, " a swampy area on the island of Gotland. 



15. LEPADELLA EHRENBERGII (Perty). 



Plate 94, figs. 1-4. 



Notogonia ehrenbcrgii Perty, Mittli. Nat. Ges. Bern., 1850, p. 20; Zur Kenntn. 

 kleinst. Lebensf., 1852, p. 42, pi. 1, fig. 5. — Hudson and Gosse, Rotifera, 

 Suppl., 1889, p. 60, pi. 33, fig. 38. 



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

 p. 356, pi. 21, fig. 10. 



Metopidia notogonia Ternetz, Rot. Umg. Basels, 1892, pp. 19, 34. 



Metopidia ehrenbcrgii Jennings, Bull. Micliigan Fish Comm., No. 3, 1894, p. 26. 

 —Weber, Zool. Jalirb., Syst., vol. 24, 1906, p. 216.— v. Hofsten, Ark. Zool., 

 Stockholm, vol. 6, No. 1, 1909, p. 72, text fig.— Lie-Pettersen, Bergens Mus. 

 Aarb. (for 1909), 1910, No. 15, p. 70, pi. 2, fig. 15. — Dieffenbach, Siisswasser- 

 fauna Deutschlands, pt. 14, 1912, p. 186. text fig. — Murray, Journ. Royal 

 Micr. Soc, 1913, p. 459, pi. 19, fig. 8.— Penard, Rev. Suisse Zool., vol. 22, 

 1914, p. 8. 



Lepadella ehrenbergii Harring, Bull. 81 U. S. Nat. Mus., 1913, p. 63. 



The normal form of this species, to which the following description 

 refers unless specially noted, is shown in the dorsal view, figure 2: 

 Figure 1 represents a local, slightly aberrant race. The lorica is 

 broadly ovate in outlme and produced postero-laterally into two broad 

 triangular spure, curving upward and forward; at the sides of the foot 

 groove there are two similar but smaller and less curved spurs. The 

 lateral spurs have on the doreal side a central ridge and are triangular 

 in cross section. The width of the body over the lateral spurs equals 

 the length of the lorica ; immediately in front of the spurs the width 

 is approximately two-thirds of the length. The depth of the body, 

 which is greatest near mid-length, is more than one-third of the 

 length. The dorsal plate is strongly convex and evenly rounded; 

 the ventral plate is nearly flat. The cross section of the body in 

 front of the spurs is nearly semicircular; figure 4 represents a section 

 through the spurs, where the dorso-ventral depth is much smaller. 



The anterior margin is very wide, nearly one-third the length of 

 the lorica. The dorsal sinus is very shallow and evenly rounded; 

 its depth is about one-fourth of its width. The ventral sinus is 



