CHAPTER TWO 



Cyclostomes 



BY 

 HENRY B. BIGELOW and WILLIAM C. SCHROEDER 



ACKNOWLEDGMENTS 



Many persons have contributed information used in the preparation of this paper; to 

 all of them we are grateful. Our thanks are due in particular to A. A. Blair, Wilfrid 

 Templeman, A. G. Huntsman, R. A. McKenzie, Raymond T. Kinney, and Ralph 

 H. Osborn for assembling information as to the status of the Sea Lamprey in the rivers 

 of Newfoundland, the Maritime Provinces of Canada and Massachusetts; to John 

 Tee-Van for photostatic copies of bibliographic citations; to A. S. Romer, who assisted 

 in the classification; to Ludlow Griscom and James A. Peters for assistance on scientific 

 nomenclature; to H. W . Fowler and Leonard P. Schultz for assistance in numerous 

 ways, and finally to the late Thomas Barbour, who placed the collections of the 

 Museum of Comparative Zoology at our disposal. 



GENERAL DISCUSSION 



Scope of Study. The following pages give descriptions, life histories, geographic distribu- 

 tion so far as known, and lists of published citations for the genera and species of marine 

 Cyclostomes that are known to occur on the western side of the North Atlantic. The char- 

 acterizations of the orders, families and genera cover the Cyclostomes as a whole, as does 

 the key to the species of the only genus in question that includes more than a single marine 

 representative. 



Descriptions. These are based on the Study Material listed under each species. The ac- 

 counts of the habits and geographic distribution are taken partly from the published rec- 

 ords, partly from data of our Study Material, and partly on information from numerous 

 correspondents, supplemented by our own observations. 



Keys. The keys, from the higher groups down to species, have been prepared solely 



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