522 Wisconsin Academy of Sciences, Arts, and Letters. 
sory teeth are attached to the tip of the left uncus; there are none 
on the right side. The basal plate of the manubria is rather small 
and rounded; the central portion is long and slender, somewhat 
irregularly curved and tapers gradually towards the posterior 
end. The slender reenforcing rods imbedded in the walls of the 
mastax of so many Notommatids are in this species fibrillate at 
the ends and fused to the rami. The piston is very large and pow¬ 
erful and, as far as can be judged from the structure of the 
mastax, the pumping function is of primary importance and pre¬ 
hension secondary. The salivary glands are very large and of 
the same size. 
The oesophagus is very long and slender. The gastric glands, 
ovary and bladder are normal. There is no distinct separation be¬ 
tween stomach and intestine. The foot glands are small and pyri¬ 
form ; a minute mucus reservoir may be concealed in the basal en¬ 
largement of the toes. 
The ganglion is large and saccate; the spherical, ductless, vacuo¬ 
late retrocerebral sac is attached to its posterior end. No sub¬ 
cerebral glands are present. There is no true eyespot; the anterior 
portion of the sac is filled with a mass of red pigment granules, 
diffusing among its vacuoles, but not enclosed in any capsule. 
Total length 300-350/x; toes 14-18/x; trophi 
Besticula nyssa has been found only at Bargaintown, near At¬ 
lantic City, New Jersey. Its nearest relatives are B. melandocus 
and B. anceps; it is readily recognized by its large size, slender 
body and the very simple, ventral corona, as well as the structure 
of the eyespot. 
Genus EOSPHORA Ehrenberg. 
Notommatid rotifers with fusiform, illoricate body, nearly cyl- 
indric anteriorly and tapering to a distinct tail; the foot is usually 
tubular and moderately long; the two toes are short. 
The corona is frontal, with a marginal wreath and a lateral, in¬ 
ner arc of cilia joined to it and simulating auricles; the mouth is 
at the ventral margin of the buccal field and the intra-marginal 
ciliation has largely disappeared. 
The mastax is virgate, but the pumping action has been partly 
lost; the fulcrum is short and very broad; the rami are triangular 
and bent at a right angle near mid-length, where one or two large^ 
blunt teeth are usually present; the unci have a single, very large 
