2 University of Michigan 



tained for the collection of the Academy of Natural Sciences 

 of Philadelphia years ago, some others were more recently re- 

 ceived with Cope's collections shortly after his death. 



In 19 1 7 Dr. Alexander G. Ruthven suggested that I study 

 over our Michigan material and furnish him a report, as it 

 would be desiderata in connection with the local ichthyological 

 explorations now being carried on. Accordingly I searched 

 our collections and have been able to present details concerning 

 types or specimens of sutBcient importance. The entire list 

 of Cope's fishes is the basis of this paper, and such references 

 as pertain to his materials are included. In cases where his 

 species are no longer represented by specimens no comment is 

 made. A small collection made about 1901 at Pequaming, 

 Lake Superior, in Baraga County, by Mr. Morgan Hebard, is 

 also included. 



PETR0MYZ0NID.1v 



Iclitli\omy:^on concolor (Kirtland) 



Ichthyoinyzon argcntatns Cope, Proc. Acad. Nat. Sci. Phila., 1864, 

 p. 276. 



■ EiitospJicnus ffpyptcrus (Abbott) 



Lampetra cepytera Fowler, Proc. Acad. Nat. Sci. Phila., 1907, p. 465. 

 Grosse Isle and Ann Arbor. 



Two examples in poor preservation, both received from 

 Cope, and the Grosse Isle one, a nearly metamorphosed larva, 

 obtained by ]-*rof. Charles Fox. They agree with other ma- 

 terial from New Jersey, Pennsylvania and Iowa. 



Two small lampreys without data and belonging to the pre- 

 ceding species may have come from Michigan. Mr. H. Cum- 

 mins informs me that the example I recorded in 1907 as the 

 present species is also the preceding species. 



