Earring and Myers—The Rotifers of Wisconsin. 617 
form with well-developed alulae and without the dorsal right- 
angled extension usually present. The external edges of the 
rami have a thin, lamellar extension of somewhat different form 
on the two sides. The width of the rami is variable; the ex¬ 
tremes are shown on Plate LIII, figures 11 and 12. This is 
the only instance of noticeable variation that we have found in 
the trophi of the Notommatid rotifers studied. These extremes 
are somewhat rare; the majority closely approximate the mean 
between the two variations figured. The fulcrum is a fairly 
large, subsquare plate, as long as the rami. The unci have two 
functional teeth and one rudimentary tooth. The principal tooth 
is long, slender, and acutely pointed, with a decided curve near 
the tip, to which is loosely attached the rudimentary tooth, about 
one third the length of the main tooth. The second functional 
tooth is very slender, with a very much enlarged, barb-like tip, 
closely appressed to the point of the principal tooth. The manu¬ 
brium is of the normal form, with a large, crescent-shaped an¬ 
terior branch forming an approximately right angle with the 
median branch, which is rather slender and very slightly de- 
curved; the dorsal branch is lamellar and curves inwards. No 
epipharynx is present. 
The oesophagus is moderately long and slender. The gastric 
glands are of moderate size and ovate outline. Stomach and in¬ 
testine are indistinctly separated. The bladder is large and pyri¬ 
form. The ovary is of the normal, elongate-ovate form and rather 
large. The foot glands are moderately long and slightly club- 
shaped. 
The ganglion is moderately large and somewhat elongate. The 
retrocerebral organ is reduced to a small, ductless sac enclosing 
the eyespot at the posterior end of the ganglion and filled with 
red pigment granules, most abundant at the anterior surface. 
Total length 500-550/a ; toes 12-14/a; trophi 25/a long, 36/a wide. 
Lindia producta is fairly common in swampy ponds and bogs 
in Polk County, Florida. It has not been found elsewhere. 
This species is readily recognized by its large size, general 
form, and the very small toes. 
