Certain Protozoa and Other Invertebrates. 2438 
The leaves upon which it grows are often eaten by fishes, probably 
for the sake of the Plumatella. The yellow perch and bluegill are the 
species in whose stomachs we found it most abundantly. The stomach 
of a bluegill caught at the Weedpatch October 26 (1904) was full of 
stadioblasts. During the autumn of 1904 it was noted as exceedingly 
abundant. 
So far as we know, Plumatella polymorpha is the only Bryozoan 
in this lake. 
THE SPONGES. 
Sponges are not especially abundant in the lake. In some of the not 
far distant lakes, as Winona Lake, they frequently form a thick coating 
around the submerged portions of bulrushes growing out in the water, 
but at Lake Maxinkuckee this was not observed. They are not common 
on the rocks. On September 9 (1906) some were found forming a coat- 
ing on submerged rocks on the east side, and some of these were col- 
lected a few days later. On November 5 (1906) some flat ones found 
on rocks on the east side were apparently being eaten by insect larve. 
On September 22 (1907) Prof. U. O. Cox of the Indiana State Normal 
found some flat sponges covering a rock where the lake enters the Outlet 
at the wagon bridge, and there were more on a rock farther down be- 
tween the wagon and railroad bridges. This completes the record for 
the flat sponges. 
A long, green, string-like form found hanging among the weeds at 
the lake, especially at the Weedpatch, was much more common. This 
was observed quite frequently and often obtained when collecting aquatic 
plants. Occasionally these long strings were washed up near shore. 
On October 27 (1900) these sponges were observed forming stadioblasts 
on the weeds in Lost Lake. 
Occasionally the sponges form small, blue-green, spherical masses, 
like bullets, around the stems of Chara. On January 22 (1901) some 
of these spherical sponges were observed on carpet chara about five feet 
out from the Arlington Hotel. 
Sponges are quite common in creeks and ponds near the lake. The 
long form is common in Twin Lakes. There are long, finger-like forms 
in Yellow River, and they were abundant in the Outlet about the bridge 
below Walley’s. 
The sponges were submitted for identification to Mr. Edward Potts, 
of Media, Pa., who in a letter dated May 24 (1905) writes so interest- 
ingly regarding the material that we here quote his letter in full: 
Yours with package of material was received by first mail 
yesterday A.M.; and having nothing important on hand, I ex- 
amined the vials at once, with the following results: 
