Harring & Myers—Rotifer Fauna of Wisconsin — II. 437 
PROALES DOLIARIS (Eousselet). 
Plate XIX, figures 3-7. 
Microcodides doliaris Eousselet, Journ. Quekett Micr. Club, ser. 2, vol. 6, 
1895, p. 120, pi. 7, fig. 6. Voigt, Forschungsber. Biol. Stat. Plon, vo. 11, 
1904, p. 20, pi. 2, fig. 9.— Voronkov, Trudy Hidrobiol. Slants. Glubokom 
Oz., vol. 2, 1907, p. 86.— Stevens, Trans. Devonshire Ass. Sci., 1912, p. 686. 
Collin, Siisswasserfauna Deutschlands, pt. 14, 1912, p. 60, fig. 95.— 
Jakubski, Eozpr. Wiad. Muz. Dzieduszyckich, vol. 1, No. 3-4, 1915, p. 11. 
Mikrocodides doliaris Harking, Bull. 81 U. S. Nat. Mus., 1913, p. 70. 
The body is short, extremely stout and gibbous; its greatest 
width is nearly equal to one half the total length. The integument 
is very flexible, but the outline is nevertheless quite constant. The 
entire body is hyaline. 
The head is short, broad and obliquely truncate, joining the 
abdomen without any constriction; its width is about one half of 
the greatest width of the body. The abdomen is ovoid or nearly 
spherical; it terminates in a short, sleeve-like tail surrounding the 
base of the foot. The dorsal surface is marked with flve or six in¬ 
distinct, transverse folds. The foot is short and two-jointed; the 
length of the terminal joint is barely equal to its width, of the 
basal joint nearly twice the width. The toe is single, acutely 
pointed and fusiform; its length is about one tweKth of the total 
length. As two normal foot glands are present, it is evident that 
the single toe originated by the fusion of two separate toes and is 
not to be considered as an unpaired toe; it would therefore be 
erroneous to attach any special signiflcance to this distinctive fea¬ 
ture. 
The dorsal antenna is a small setigerous papilla at the junction 
of the head and abdomen; the lateral antennae are somewhat far¬ 
ther back than usual. 
The corona is strongly oblique and consists of a circumapical 
band of relatively short cilia with two lateral, auricle-like tufts of 
long cilia adapted to swimming. On the unciliated apical plate 
are two minute papillae with a few sensory setae; the buccal field 
is evenly ciliated. The mouth is near the ventral edge of the 
corona. 
The mastax represents a somewhat unusual modification of the 
intermediate type common to this genus. The fulcrum is a nearly 
parallel-sided, thin lamella. The medial portion of the rami form 
a roughly lyrate forceps; this is extended laterally by very thin 
lamellae, thus giving the incus a triangular outline. The basal 
