Number 120 July 6, 1922 



OCCASIONAL PAPERS OF THE MUSEUM OF 

 ZOOLOGY 



UNIVERSITY OF MICHIGAN 



Ann Arbor, Michigan Published by the University 



A REVISION OF THE HOLARCTIC LAMPREYS 

 By Charles W. Creaser and Carl L. Hubbs 



Introduction 



Regan's synopsis of the marsipobranchs of the order 

 Hyperoartii, pubUshed in 1911/ placed the taxonomy of the 

 lampreys on a fairly sound basis. Although we adopt this 

 classification as a whole, we find it necessary to propose cer- 

 tain refinements, both of taxonomic and nomenclatural char- 

 acter. 



In the present revision we deal with all the known Holarctic 

 lampreys, but do not consider the Antarctic types. We have 

 examined the collections of the following museums : United 

 States National Museum, Stanford University collections, 

 American Museum of Natural History, Field Museum of Nat- 

 ural History, and the Museum of Zoology of the University 

 of Michigan. We wish to thank the officials of these institu- 

 tions for the use of their lamprey material. 



1 Ann. Mag. Nat. Hist., Ser. 8, Vol. 7, pp. 193-204. 



