38 MIDLAND NATURALIST. 
2. C. latitenta, (/) Potts, found in Chester Creek, Pa., and 
in Western New York. 
3. C. tenosperma, (/) Potts. First found by Mr. Potts in a 
ril at the Centennial Fair Grounds, Philadelphia, 
and later in New Jersev. 
In conclusion let me state that the principal object in writing 
this communication for the Midland Naturalist is to stimulate 
students in its territory in the study of Fresh Water Sponges; I 
would like to see all localities in its territory where any of the 
species are found, reported in these pages. 
Bibliography. Bowerbank, Monograph of Spongillidae 1863. 
Carter, History and Classification of the known species of 
Spongilla, 188r. 
Potts. Fresh Water Sponges, A Monograph. Proceed- 
dings of Academy of Natural Sciences, Philadelphia, 
1887. This Monograph is indispensable for the study of 
American Fresh Water Sponges. 
It covers the whole ground of Fresh Water Sponges and gives 
special facilities for the determination of all American species as 
far as known. 
Vosmaer, Klassen und Ordnungen der Spongien. (Porifera) 
2nd vol. of Bronn’s, Klassen und Ordnungen des Thier-Reichs. 
` Laboratory of Zoology 
University of Notre Dame 
Tentative List of Myxomycetes of Northern Indiana 
and Southern Michigan. 
L. BARBAZETTE. 
The following list of the Myxomycetes of northern Indiana and 
southern Michigan represents only part of those actually observed 
in this locality, and only those species are mentioned which are at 
present found in the herbarium of the University. They were 
collected by Dr. J. A. Nieuwland of the botanical department of 
Notre Dame University, during the months of July and August in 
the year 1905. Favorable conditions for growth, warm weather 
followed by periodical rains, were prevalent at that time and many 
? : of the plants that were developed then have not been seen since. 
