Harring & Myers—Rotifer Fauna of Wisconsin — II. 473 
1907, p. 105.— De Beauchamp, Arch. Zool. Exper., ser. 4, vol. 10, 1909, 
p. 203, fig. XXI A.— Von Hopsten, Arkiv Zool., Stockholm, vol. 6, No. 1, 
1909, p. 50.— Lucks, Rotatorienfauna Westpreusseiis, 1912, p. 92.—■ 
Sachse, Siisswasserfauna Deutschlands, pt. 14, 1912, p. 223, fig. 227.— 
Montet, Rev. Suisse Zool., vol. 23, 1915, p. 330.— Jakubski, Rozpr. Wiad. 
Muz. Dzieduszyckich, vol. 1, No. 3-4, 1915, p. 21.— ^Weber and Montet, 
Cat. Invert Suisse, pt. 11, 1918, p. 135. 
The body is moderately elongate, slightly compressed laterally 
and gibbous dorsally. The head is large and oblique anteriorly. 
The neck is well marked. The abdomen increases slightly in width 
for about two thirds of its length and is rounded posteriorly; the 
lorica is firm and the plates very distinct; the lateral clefts are 
rather narrow anteriorly and increase gradually in width towards 
the posterior end. The foot is small and conical; the small tail 
is near mid-length. The toes are very long, straight or recurved 
and very slender; the basal portion is broad and tapers rapidly 
to the nearly parallel-sided, very slightly tapering main portion; 
the extreme tips are conical. The length of the toes is about one 
third of the total length. 
The corona is oblique and strongly convex without projecting lips. 
The mastax is very large and the trophi of the normal type. 
The inner ventral edges of the rami are near the apex provided 
with comblike, denticulate lamellae; the fulcrum is broadly ex¬ 
panded at the posterior end an'd the manubria are strongly 
crutched; the unci have only a single tooth. The gastric glands 
are rather small. 
The ganglion is very long and saccate; no retrocerebral organ 
is present. The eyespot is frontal and consists of a spherical cap¬ 
sule, the anterior half transparent, the posterior filled with pigment 
granules. 
Total length 250-300/a; toes 70-80/a; trophi 60/a. 
Cephalodella gihha is abundant in weedy ponds everywhere. It 
is somewhat variable, especially in the curvature of the toes; speci¬ 
mens with virtually straight toes are not rare and in the early 
spring months they predominate over the curved toed variety. 
CEPHALODELLA GRACILIS (Ehrenberg). 
Plate XXVII, figure 1. 
Furcularia gracilis Ehrenberg, Abh. Akad. Wiss. Berlin (for 1831), 1832, 
p. 130; Infusionsthiercken, 1838, p. 421, pi. 48, fig. 6.—Eckstein, 
Zeitschr. Wiss. Zool., vol. 39, 1883, p. 374, pi. 26, fig. 43.— Hudson and 
