130 
THIRTEENTH REPORT. 
NOTES ON MICHIGAN CRUSTACEA. I. 
A. S. PEARSE. 
In the twelfth report of this Academy, the writer published a prelim- 
inary list of the Crustacea of Michigan. 1 Although every effort was 
made to include all references to the carcinological fauna of this state, 
one paper by E. B. Williamson 2 was overlooked. The localities men- 
tioned by this author are, therefore, included iu the present paper. Dur- 
ing the past year the University of Michigan Museum has received 
crustaceans from several sources, and, although no new species for the 
state have been secured, the ranges of several have been extended. The 
following records represent new localities for the species listed : 
CLADOCERA. 
Bosm'ma longirostris O. F. M. Douglas Lake, Cheboygan County. 
Daphnia hyalina Leydig. Douglas Lake, Cheboygan County. 
Leptodora hyalina Lilljeborg. Douglas Lake, Cheboygan Count}'. 
Polyphemus pediculus Linn. Douglas Lake, Cheboygan County. 
COPEPODA. 
Cyclops bicuspidatus Claus. Douglas Lake, Cheboygan County. 
Epischura lacustris Forbes. Douglas Lake, Cheboygan County. 
AMPHIPODA. 
Gammarus limnams Smith. Carp Creek, Cheboygan County. 
DECAPODA. 
Cambarus argillicola Faxon. Douglas Lake, Cheboygan County. This 
record is of particular interest for the species has not previously been 
recorded farther north than Saginaw and Gratiot Counties. 
Cambarus bartoni robustus (Girard). Charity Islands and Port 
Austin in Huron County; Ionia County. Williamson (op. cit .) found 
C. bartoni north of Sault Ste. Marie in Canada, but all the specimens 
from Michigan are of the variety robustus. However, no representa- 
tives of this species have as yet been taken in Michigan from Lake Su- 
perior. 
Cambarus propinquus Girard. Charity Islands and Port Austin 
in Huron County; Cass, Chippewa, (Williamson, op. cit.) and Ionia 
Counties. 
. Cambarus virilis Hagen. Emmet County (Williamson, op. cit.). 
Ann Arbor, Mich., April, 1911. 
CPearse, A. S. 1910. A Preliminary List of the Crustacea of Michigan. 12th Rept. Mich. Acad 
Sci., pp. 68-76. 
2 Williamson, E. B. 1907. A Collecting Trip North of Sault Ste. Marie, Ontario. Ohio Natur. 
Vol. 7, pp. 129-148. 
