578 Wisconsin Academy of Sciences, Arts, and Letters. 
Notommata peridia appears to be rare. It has been collected 
only at Oceanville, near Atlantic City, New Jersey, and in Star¬ 
vation Lake, Loon Lake, and swampy ponds at Eagle River, Yilas 
County, Wisconsin; Starvation Lake, about 5 miles southwest of 
Eagle River, is the only station where it it has been found in 
abundance. The animal is invariably found inhabiting an exceed¬ 
ingly tough jelly-case, even more resistant than the case of Te- 
trasiphon hydrocora, and this affords much-needed protection 
against enemies, as it appears to be unable to swim at all, on ac¬ 
count of the feeble development of the corona and the absence of 
auricles. 
This species has a superficial resemblance to Tetrasiphon hydro- 
corn, but apart from its much smaller size is readily distinguish¬ 
able by the two small papillae on the tail, as well as by the retro- 
cerebral organ and the trophi. 
NOTOMMATA AURITA (Muller) 
Plate XLVIII, figures 6-9 
Vorticella aurita Muller, Anim. Inf us. (1786), p. 288, PI. 41, figs. 1-3. 
FurciMaria aurita Lamarck, Hist. Nat. Anim. sans Vert. 2 (1816): 38. 
Ft otommata aurita Ehrenberg, Abh. Akad. Wiss. Berlin 1830: 46; ibid. 
(for 1831) 1832: 131, PI. 4, fig. 12; Infusionsth. (1838), p. 430, PI. 
52, fig. 3.— Gosse, Trans. Micr. ,Soc. London 3 (1852): 93, PI. 12, 
figs. A, B, PI. 15; Phil. Trans. Royal Soc. London 146 (1856): 430, 
PI. 16, figs. 16-21.— Leydig, Zeitschr. Wiss. Zool. 6 (1854): 38, PI. 
3, fig. 30.— Eckstein, Zeitschr. Wiss. Zool. 39 (1883): 360, PI. 25, 
figs. 23-27.— Plate, Jenaische Zeitschr. Naturw. 19 (1886): 21.— 
Hudson and Gosse, Rotifera (1886) 2: 21, Ft. 17, fig. 6.— Wierzej- 
ski, Rozpr. Akad. Umiej., Wydz. Mat.-Przyr. Krakow II, 6 (1893): 
|227.-— Skorikov, Trav. Soc. Nat. Kharkow 30 (1896): 285.-— Weber, 
Rev. Suisse Zool. 5 (1898): 439, PI. 17, figs. 16-18.— Wesenberg- 
Lund, Yid. Medd. Nat. Poren. Kj0benhavn 1899, PI. 1, fig. 14.— von 
Hofsten, Arkiv Zool., Stockholm 6 1 (1909): 28, fig. 4.— de Beau¬ 
champ, Arch. Zool. Exp. IV, 10 (1909): 158, fig. XII C.— Lie-Pet- 
tersen, Bergens Mus. Aarbog (for 1909) 1910 15 : 39.— Hirsch- 
felder, Zeitschr. Wiss. Zool. 96 (1910): 326, PI. 13, figs. 41-46.— 
Voigt, Siisswasserfauna Deutschlands, pt. 14 (1912): 98, fig. 177.— 
Montet, Rev. Suisse Zool. 23 (1*915): 320.— Weber and Montet, 
Cat. Invert. Suisse, fasc. 11 (1918): 111, fig. 31. 
Cycloglena lupus Ehrenberg, Abh. Akad. Wiss. Berlin 1830: 48; In¬ 
fusionsth. (1838), p. 454, PI. 56, fig. 10. 
Notommata lupus Eyferth, Mikr. iSusswasserbew. (1877), p. 49. 
