538 Wisconsin Academy of Sciences, Arts, and Letters. 
in accordance with accepted rules of nomenclature. However, it is 
very evident that the genus includes two perfectly distinct species 
and it is not now possible to refer C. orhis definitely to one or the 
other. For this reason we have used the later name longiseta, as it 
unquestionably belongs to the smaller species. 
MONOMMATA GRANDIS Tessin. 
Plate XLIII, figures 6-10. 
Monommata grandis Tessin, Arch. Naturg. Mecklenburg, vol. 43, 1890,. 
p. 151, pi. 1, figs. 11, 12.— Levander, Acta See. Pauna et Flora Fennica,. 
vol. 12, No. 3, 1895, p. 35. 
Furcularia longiseta grandis Rousselet, Journ. Quekett Micr. Club, ser. 2, 
vol. 6, 1895, p. 124, pi. 7, fig. 3. 
Monommata longiseta grandis Stenroos, Acta. Soc. Fauna et Flora Fennica, 
vol. 17, No. 1, 1898, p. 135.— Voigt, Forschungsber. Biol. Stat. Plon,. 
vol. 11, 1904, p. 56; Siisswasserfauna Deutschlands, pt. 14, 1912, p. 104. 
—Weber and Montet, Cat. Invert. Suisse, pt. 11, 1918, p. 119. 
Monommata appendiculata Stenroos, Acta. Soc. Fauna et Flora Fennica, 
vol. 17, No. 1, 1898, p. 135, pi. 1, figs. 33, 34. 
Monommata orhis grandis Harring, Bull. 81 U. S. Nat. Mus., 1913, p. 72. 
The body of this species is moderately slender, elongate ovate 
and spindle-shaped; its greatest width is less than one third of 
the length. The integument is rather flexible and the outline 
is quite constant. The body is moderately transparent. 
The head segment is moderately large and the width nearly 
equal to the length. It is separated from the abdomen by a well 
marked constriction. The abdomen is elongate and ovate, distinctly 
gibbous dorsally and rounded posteriorly; the integument is 
marked with very closely spaced, unbroken longitudinal striae, 
acute-angled at the bottom of the grooves and the top of the ridges. 
The foot is short, stout and obscurely two-jointed. The toes are 
extremely long and unequal; their length, both absolute and rela¬ 
tive, is highly variable; the left toe is always shorter than the 
right, the difference varying betw^een one third and one fifth of 
the length of the right toe. The basal portion of the toes, from 
one third to one half of its length, is very nearly straight for the 
greater part of its length; this is followed by a tapering section, 
which passes into the very nearly cylindrical, extremely slender 
posterior portion, which is from one half to two thirds of the entire 
length. The right toe is straight and in the axis of the body; the 
left toe curves slightly upwards and to the left. 
