Earring & Myers—Rotifer Fauna of Wisconsin — II, 459 
Pleurotrocha truncata Gosse. 
Pleurotrocha truncata Gosse, Ann. Mag. Nat. Hist., ser. 2, vol. 8, 1851, 
p. 199. 
Theora truncata Eckstein, Zeitschr. Wiss. Zool., vol. 39, 1883, p. 372. 
FLEUEOTBOCHA PETBOMYZON Ebreuberg. 
Plate XXV, figures 1-4. 
Pleurotrocha petromyBon Ehrenberg, Abh. Akad. Wiss. Berlin, 1830, p. 46.— 
Von Hofsten, Arkiv Zool., Stockholm, vol. 6, No. 1, 1909, p. 12. 
^ Notommata gihha Ehrenberg, Abh. Akad. Wiss. Berlin (for 1831), 1832, 
p. 132, pi. 4, fig. 15; Infusionsthierchen, 1838, p. 430, pi. 52, fig. 4. 
Notommata petromyzon Ehrenberg, Infusionsthierchen, 1838, p. 427, pi. 50, 
fig. 7.— Gosse, Phil. Trans. Eoyal Soc. London, vol. 146, 1856, p. 432, pi. 17, 
figs. 27-31. 
Proales petromyzon Hudson and Gosse, Eotifera, 1886, vol. 2, p. 37, pi. 18, 
fig. 9.— Kertesz, Budapest Eotat. Eaun., 1894, p. 30.— Hood, Proc. Eoyal 
Irish Acad., ser. 3, vol. 3, 1895, p. 680.— Skorikov, Trav. Soc. Nat. Khar- 
kow, vol. 30, 1896, p. 291.— Weber, Eev. Suisse Zool., vol. 5, 1898, p. 469, 
pi. 18, figs. 21-23.— Voigt, Eorschungsber. Biol. Stat. Plon, vol. 11, 1904, 
p. 42; Susswasserfauna Deutschlands, pt. 14, 1912, p. 90, fig. 160.— 
Be Beauchamp, Arch. Zool. Exper., ser. 4, vol. 6, 1907, p. 9, fig. 5.— ^Lie- 
Pettersen, Bergens Mus. Aarbog (for 1909), 1910, No. 15, p. 43.— Mola, 
Ann. Biol. Lac., vol. 6, 1913, p. 243.— Montet, Eev. Suisse Zool., vol. 23, 
1915, p. 322.— Jakubski, Eozpr. Wiad. Muz. Dzieduszyckich, vol. 1, No. 
3-4, 1915, p. 16.— ^Weber and Montet, Cat. Invert. Suisse, pt. 11, 1918, 
p. 99. 
Notops laurentinus Jennings, Bull. Michigan Fish Comm., No. 3, 1894, p. 12, 
figs. 3, 4. 
Proales laurentinus Jennings, Bull. Michigan Pish Comm., No. 6, 1896, p. 91. 
Pleurotrocha laurentina Harring, Bull. 81 U. S. Nat. Mus., 1913, p. 85. 
The body is short, stout and gibbous; its greatest width is about 
one third of the entire length. The integument is soft and very 
flexible, but the general outline is nevertheless quite constant. The 
body is very transparent. 
The head and abdomen are separated by a rather shallow con¬ 
striction. The head is small and short and somewhat oblique an¬ 
teriorly. The abdomen is pyriform and tapers posteriorly to the 
base of the foot; there is no tail. The foot is long, cylindric and 
two-jointed; the length of the basal joint is equal to its width and 
the terminal joint is twice the length of the basal. The toes are 
very short, conical, acutely pointed and very slightly recurved at 
the tips; their length is about one twentieth of the length of the 
body. 
The antennae are minute setigerous papillae, the dorsal in the 
normal position, the lateral just beyond mid-length. 
