292 North American Specie* of PetroniyzoutitLe. 



Habitat. — Coasts of Western North America, from British 

 Columbia to Monterey, ascending rivers in spring to spawn. 



The studies and collections of Professors Jordan and Gilbert 

 on the Pacific Coast of North America, seem to leave no doubt 

 that all the specimens of anadromous lampreys on the Pacific 

 Coast (called tridentatus, ciliatus, lividus, astori and epihexodon 

 by authors) are forms of a single species. 



The specimen now before us Is from Walla Walla, and is 26 

 inches in length. It was obtained by Capt. Charles Bendire. 



6 AMMOCGETES AUREUS. 



??Petromyzon fluvialis Richardson, "Franklin's First Journey, 1823, 705" 

 (Arctic America). ? Richardson, Fauna Boreali- Americana, 1836, 

 284 (not P. jiuviatilis L.). 



?? Pelromyzon borealis Girard, U. S. Pac. R. R. Surv., 1858, 377 (no descrip- 

 tion ; based on Richardson ; not Ammocoetes borealis Agassiz). 



Ammocoetes aureus Bean, Proc. U. S. .Nat. Mus., 1881, 159 (Anvik, Yukon R.). 

 Jordan & Gilbert, Synopsis Fish. N. A., 1882, 868 (copied). Joidan, 

 Cat, Fish. N. A,, 1885, 4. 



Habitat. — Streams of Alaska. 



This species is known to us only from the description of Dr. 

 Bean. It seems to approach more nearly than any other of our 

 species to the European Ammocoetes jiuviatilis L. A comparison 

 of Dr. Bean's description with figures of the latter species shows 

 numerous differences in details of measurement. 



7 AMMOCCETES CIBAKIUS. 



Pelromyzon plumbeus Ayres, Proc. Cal. Ac Nat. Sci., 1855, 27 (San Fran. 



Cisco). Girard, U. S. Pac. R. R. Surv., 1858, 380 (San Francisco). 



(Not Pelromyzon plumbeus Shaw.) 

 Lampetra plumbea Gill, Proc. Ac. Nat. Sci. Phila., 1862. 331 (name only). 



Jordan & Gilbert, Syn. Fish. N. A., 1883, 8 (copied). 

 Ammocoetes plumbla Jordan & Gilbert, Proc. U. S. Nat. Mus. , 1880, 458 ; 



1881, 30 (Seattle, Puget Sound ; San Francisco). Bean, Proc. U. S. 



Nat. Mus., 1882, 93 (Garrison Creek, near Walla Walla). 

 Ammocoetes cibarius Girard, U. S. Pac. R. R. Surv.. 1858, 383 (Puget Sound, 



larval form). Jordan, Cat. Fishes N. A., 1885, 4. 

 Pelromyzon ayresi Glinther, Cat. Fish. Brit. Mus., VIII, 505, 1870 (British 



Columbia). 



Habitat. — Rivers of Western North America from Frazer's 

 River to the Sacramento. 



