452 Wisconsin Academy of Sciences, Arts, and Letters. 
roughly hemispherical rami; the manubria are long and slender 
with a rudimentary basal plate; the unci have a strongly devel¬ 
oped ventral tooth and one or two additional, rudimentary teeth. 
The piston is very large and fills the entire cavity of the mastax. 
The rodshaped transverse supports, which are found imbedded in 
the walls of the mastax below the posterior margin of the rami 
in many Notommatids, are absent in this genus. 
The retrocerebral sac is present in all of the species, but there 
are no subcerebral glands. The eyespot is at the posterior end 
of the ganglion. 
Type of the genus.—Taphrocampa annulosa Gosse. 
TAPHROCAMPA ANNULOSA Gosse. 
Plate XXIII, figures 6-10, 
Taphrocampa annulosa Gosse, Ann. Mag. Nat. Hist., ser. 2, vol. 8, 1851, 
p. 199.— Hudson and Gosse, Eotifera, 1886, vol. 2, p. 16, pi. 17, fig. 12.— 
Petr, Sitzungsber. Bohm. Ges. Wiss. (for 1890), 1891, p. 220.— Ternetz, 
Rotat. Umg. Basels, 1892, p. 11.— Glasscott, Proc. Royal Dublin Soc., 
new ser., vol. 8, 1893, p. 43.— Wierzejski, Rozpr. Akad. Umiej., Wydz. 
Mat.-Pryzr., Krakow, ser. 2, vol. 6, 1893, p. 227— Levander, Acta Soc. 
Pauna et Plora Pennica, vol. 12, No. 3, 1895, p. 26.— Weber, Rev. Suisse 
ZooL, vol. 5, 1898, p. 433, pi. 17, figs. 11-13.— Stenroos, Acta Soc. Pauna 
et Plora Pennica, vol. 17, No. 1, 1898, p. 123. Hempel, Bull. Illinois 
State Lab. Nat. Hist., vol. 5, 1898, p. 369.— Jennings, Bull. U. S. Pish 
Comm., vol. 19 (for 1899), 1900, p. 84, pi. 16, figs. 13, 14.— Voigt, Por- 
schungsber. Biol. Stat. Plon, vol. 11, 1904, p. 38; Siisswasserfauna Deutsch- 
lands, pt. 14, 1912, p. 92, fig. 165.— Voronkov, Trudy Hidrobiol. Slants. 
Glubokom Oz., vol. 2, 1907, p. 197.— Kofoid, Bull. Illinois State Lab. Nat. 
Hist., vol. 8, No. 1, 1908, p. 217.— Lie-Pettersen, Bergens Mus. Aarb. 
(for 1909), 1910, No. 15, p. 38.— Mola, Ann. Biol. Lac., vol. 6, 1913, p. 
240.— ^Weber and Montet, Cat. Invert. Suisse, pt. 11, 1918, p. 105. 
The body is elongate, slender and very nearly cylindric, taper¬ 
ing slightly to the foot; its greatest width is about one fourth of 
the total length. The integument is leathery and almost semi- 
loricate; its dorsal surface is viscous and usually covered with 
adhering particles of fioccose material. 
There is no distinct separation between the head and abdomen; 
both are transversely plicate, about ten ridges in the entire length, 
of which three may be taken as belonging to the head. The plica¬ 
tions do not form rings around the body; the lateral ridges alter¬ 
nate with those of the dorsal surface, forming a sort of ‘ * bellows ’ 
fold. The ventral surface is very faintly plicate. The tail is as 
