Harring & Myers—Rotifer Fauna of Wisconsin — 11. 535 
weak and plays only a subordinate part in the operation of the 
mastax. 
The retroeerebral organ is imperfectly developed; the sac is 
ductless and the glands rudimentary or absent; the eyespot is at 
the posterior end of the ganglion. 
Type of the genus. — Monommata longiseta (Muller) = Yorticella 
longiseta Muller. 
One of the most interesting results of this survey of the notom- 
matid rotifers is the discovery of the remarkable type of mastax 
of this genus; a more perfect intermediate or ^‘missing link” be¬ 
tween the forcipate and virgate mastax than that of Monommata 
grandis could hardly be imagined. If only the ventral view were 
available, it would unhesitatingly be called forcipate; its real 
affinities become evident at once in the lateral view, showing the 
curvature of the rami found only in the virgate mastax and also 
the large basal plate of the manubria. Both are developed as 
supports for the walls of the pumping type of mastax. However, 
the changes necessary to transform it into a perfectly good forci¬ 
pate mastax are small indeed. 
MONOMMATA LONGISETA (Muller). 
Plate XLIII, figures 1-5. 
? Cercaria ortis Muller, Zool. Dan. Prodr., 1776, p. 280; Anim. Infus., 
1786, p. 138, pi. 20, fig. 7. 
Yorticella longiseta Muller, Anim. Infus., 1786, p. 295, pi. 42, figs. 9, 10. 
? Trichoda Mcaudata Schrank, Fauna Boica, vol. 3, pt. 2, 1803, p. 87. 
? Vaginaria hrachiura Schrank, Fauna Boica, vol. 3, pt. 2, 1803, p. 144. 
^ Furcocerca orMs Lamarck, Hist. Nat. Anim. sans Vert., vol. 1, 1815, 
p. 448. 
Furcularia longiseta Lamarck, Hist. Nat. Anim. sans Vert., vol. 2, 1816, 
p. 39.— Hudson and Gosse, Eotifera, 1886, vol. 2, p. 46, pi. 18, fig. 16. 
—Anderson, Journ. Asiatic Soc. Bengal, vol. 58, pt. 2, 1889, p. 53. 
—Wierzejski, Eozpr. Akad. Umiej., Wydz. Mat.-Przyr., Krakow, ser. 2, 
vol. 6, 1893, p. 230.— Skorikov, Trav. Soc. Nat. Kharkow, vol. 30, 1896, 
p. 295.— Weber, Eev. Suisse Zool., vol. 5, 1898, p. 476, pi. 19, fig. 3. 
— Hempel, Bull. Illinois State Lab. Nat. Hist., vol. 5, 1898, p. 370. 
—Lie-Pettersen, Bergens Mus. Aarbog (for 1909), 1910, No. 15, p. 46. 
— Mola, Ann. Biol. Lac., vol. 6, 1913, p. 245. 
? Trichocerca orhis Bory de St. Vincent, Class. Anim. Mier., 1826, p. 42. 
F Lecane orhis Nitzsch, Enc. Wiss. u. Kiinste, sect. 1, vol. 16, 1827, p. 68. 
F BracMonus orhis Blainville, Diet. Sci, Nat., vol. 60, 1830, p. 149. 
Trichocerca longiseta Blainville, Diet. Sci. Nat., vol. 60, 1830, p. 150. 
