26 The Ottawa Naturalist [May 



The chief points in which this species (both typical and land- 

 locked varieties) differs from the preceding are the following, 



Dorsal fins separated (except at the breeding seascn in the 



males, but the notch is always deep). 

 Four bicuspid teeth on each side of mouth. 

 Fifteen to eighteen radial rows of teeth on disk ; counted next 

 the mouth opening. 

 Jordan and Fordice (1886, p. 284) refer Dekay's (1842, p. 383) 

 Ammocoetes unicolor to this variety. This is doubtful, since Dekay's 

 description and name was based upon a larva from Lake Champlain. 

 That it was the larva of this variety cannot be considered proved. 

 Evermann and Kendall (1902a, p. 218) identify the Ammocoetes 

 unicolor of Dekay with Ichthybmyzon concolor (^bdellium). Wilder's 

 name dorsatus (in Jordan and Gilbert, 1883, p. 869) is therefore to 

 be used for the land-locked variety of P. marinus, although based 

 upon a character which is not distinctive of that variety. 



References. 

 Bensley, B. A. 



1915. The fishes of Georgian Bay. , Contr. Canad. Biol., 1911- 

 1914, fasc. II, pp. 1-51. 

 Dekay, J. E. 



1842. Zoology of New York or the New York Fauna, pt. IV, 

 Fishes, pp. xiv+415. 

 Evermann, B. W. and Goldsborough, E. L. 



1908. A check list of the freshwater fishes of Canada. Proc. 

 Biol. Soc, Washington, vol. XX, pp. 89-119. 

 Evermann, B. W., and Kendall, W. C. 



1902a. An annotated list of the fishes known to occur in Lake 

 Champlain and its tributary waters. Rep. U.S. Comm. 

 Fish & Fisher, for 1901, pp. 217-225. 

 1902b. An annotated list of the fishes known to occur in the 

 St. Lawrence river. Rep. U.S. Comm. Fish & Fisher, 

 for 1901, pp. 227-240. 

 Forbes, S. A. and Richardson, R. E. 



1908. The fishes of Illinois. Nat. Hist. Survey of Illinois, 

 pp. cxxi+357. 

 Fortin, P. 



1864. Continuation of the list of fish of the Gulf and River 

 St. Lawrence. Ann. Rep. . . . during the season of 1863. 

 Rep. Comm. Crown Lands for 1863. 

 Gage, S. H. 



1893. The lake and brook lampreys of New York Wilder 

 Quart. Cent. Book, pp. 421-493. 



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