428 Wisconsin Academy of Sciences, Arts, and Letters. 
exclusively refers, probably enters the Taitc/ierm-filament through 
the point, and the alga forms a gall around it. The rotifer feeds 
on the protoplasm within reach, and when mature begins to lay 
eggs; as many as 50-60 may be laid by a single individual. Simul¬ 
taneously the body swells enormously, becoming almost spherical; 
this is caused principally by the enlargement of the stomach, which 
is probably the result of the accumulation of waste materials. Ap¬ 
parently no discharge of faecal matter takes place in the mature 
animal. 
The male has been described by Rousselet; it is remarkable in 
possessing a functional mastax. 
Rothert has made a very complete study of Proales werneckii, 
describing the rotifer in Zoologische Jahrbiicher (see synonomy), 
and the formation of the galls in Jahrbiicher f. wissenschaftliche 
Botanik. We give a short summary of his conclusions. 
The parasite appears to enter the thallus by way of the growing 
point, where the cell-wall is thin and readily pierced by the trophi; 
the galls are formed bnly where the parasite is present. When the 
point of the growing thallus is injured, it starts a new growth at 
the base of the gall, giving to this the appearance of a lateral 
branch. The “cap’^ of the gall is structurally different from the 
walls. The rotifer finally eats up the entire contents, both proto¬ 
plasm and chromatophores, and the gall dies; at the same time the 
cap falls off and the young animals find their way out. After the 
death of the gall a new supply of protoplasm will restore the in¬ 
jured section to normal life. The female is unable to complete its 
development outside of the gall. 
We have not had an opportunity to study the living animal; the 
description is based on preserved material contributed by the late 
C. P. Rousselet, and no doubt will need correction in some details. 
FBOALES BREVIPES Harring and Myers, new species. 
Plate XIX, figures 1, 2. 
The body of this species is elongate, spindle-shaped and very 
slender; its greatest width is less than one fifth of the total length. 
The integument is very flexible and the outline constantly chang¬ 
ing. The body is very transparent. 
The length of the head segment is considerably greater than its 
width; the anterior portion is separated from the head proper by 
a slight transverse fold and is the equivalent of the rostrum of the 
