Harring and Myers—The Rotifers of Wisconsin. 613 
cylindric and elongate; the mouth is at the center of a slight, 
strongly wrinkled elevation, about one fifth of the body-length 
from the anterior end. The abdomen is not strongly marked off 
from the head; its greatest width is about mid-length of the body. 
A small tail projects slightly over the base of the foot, which is 
very short and apparently unjointed. The toes are minute, coni¬ 
cal, and very slightly decurved; their length is about one twen¬ 
tieth of the length of the body. 
The dorsal antenna is a small setigerous pit in the normal po¬ 
sition; the lateral antennae have not been observed. 
The corona is a simple, circumapical ring of cilia, all very 
nearly of the same length. 
The trophi are virgate and less specialized than in the two 
other species of the genus.The fulcrum is a slender, slightly taper¬ 
ing rod without any lateral extensions for the attachment of 
muscles; the rami are strongly curved and their inner edges 
slightly thickened, but without any teeth; at their bases they are 
separated by a fairly large, lyrate opening. The large, triangu¬ 
lar, and very thin alulae distinguish this species from D. delagei 
and D. bucephalus. The manubria are slender, double-curved 
rods, crutched at the posterior ends; the unci are two oval plates 
with an elongate opening at their inner ends; it is possible that 
this opening is not really such, but closed with a very thin web. 
The salivary glands of the mastax are large, but do not reach 
the extreme development of D. delagei; there is no obvious long¬ 
itudinal division. 
With the exception of the large germary, the digestive and 
reproductive organs call for no special remarks. The foot glands 
are extremely small, with a mucus reservoir nearly equaling them 
in size. 
The ganglion is very large and saccate, filling nearly the entire 
head anterior to the mastax. No trace of a retrocerebral organ or 
eye-spot has been found. 
Total length 240-275/*; toes 8/*; trophi 20/*. 
This species occurred sparingly among decaying sphagnum 
from a roadside ditch near Mamie Lake, Yilas County. We take 
great pleasure in naming it for Mr. Chancey Juday, of the Wis¬ 
consin Geological and Natural History Survey. 
While the two previously described species are parasitic, D. 
judayi is, as far as now known, free-living; the opportunity for 
