120 Wisconsin Academy of Sciences, Arts, and Letters. 
lution of sublimate. Tbei shells being chitinous, decalcification 
was unnecessary. Delafield’s haematoxylin was found to be 
the most satisfactory stain; often following it with orange G. 
Specimens which, I wished to mount entire were killed in a 
dilute solution of Flemming, washed for several hours, and 
mounted in balsam. The strength of the Flemming and the 
time employed differed a great deal. Usually a solution of one 
part Flemming to' five parts water was taken and the specimen 
allowed to 1 remain in this for twenty to thirty minutes. 
ENTOCYTIIERE. 
Shell sub-reniform, becoming, in old individuals, slightly 
pointed anteriorly. Chitinous, thin and delicate; lateral com¬ 
pression very great. Bristles few and short. Eyes fused. 
First antenna six-segmented, slender, gradually tapering ; the 
first segment twice as large 1 as any of the others. Setae thin 
and many segmented. Second antenna four-segmented, ending 
in large claws. First segment much broader than the others. 
Flabellumj unsegmented, long and slightly curved. Mandible 
strong, with masticatory teeth. Palp four-segmented having at 
its base a small branchial plate from which arise three filar 
ments. 
Maxilla four times as long as broad, palp unsegmented. 
Branchial plate on outer surface near base bearing thirteen se¬ 
tose filaments. Legs nearly similar increasing in length from 
first to last pair. First leg bears, two bristles at; knee, others but 
one; each ends in large, curved, divided claw. Abdominal 
rami short and thick. 
Males abundant, general form and appendages similar to fe¬ 
males. Length .6 mm. 
The shell of Entocythere is smooth and fragile, being with¬ 
out any of the characteristic markings and outgrowths so com¬ 
mon in the Ostracods. The few setae present are short and re¬ 
stricted to the margin of the shell. In general, the shell 
is closer in appearance to the figures of Paradoxostoma and Ma- 
chaerina than any other forms I have seen. The shell is so 
transparent that living specimens show a number of the inter- 
