LIST OF SPECIES. 



PBTROMYZOMTID^. 



1. — Ammocoetes Dum6ril. 1828. Lamperns. 

 {Lampetra Gray; IcMhyomyzon Girard.) 



1. Amnioccetes JluviatiUs (L.) J or. Eastern streams and coast; also 



in Europe, [d. a. s.) {P. nigricans Le S.) 



2. Ammoccetes niger (Eaf.) Jor. Upper Great Lakes to Ohio Yalley. 



3. Ammocoetes argenteus (Kirt.) Jor. Great Lakes ; Ohio Valley. 



4. Ammocoetes liirudo (Grd.) Jor. Lake Brie to Arkansas. 



5. Ammocoetes castaneus (Grd.) Jor. Upper Mississippi, (d. s.) 



6. Ammocoetes plumbeus (Ayres) Jor. California. 



7. Ammocoetes horealis (Grd.) Jor. Great Slave Lake. {d. s.) 



2. — Entosphenus Gill. (Not yet characterized.) 



8. Entosphenus tridentatus (Gairdner) Gill. Oregon. (P. lividus Grd.) 



9. JEntosphenus epihexodon Gill. California, {d, s.) (P. tridentatus 



Grd. non Gairdn.) 



10. Entosphenus ciUatus (Ayrjes) Gill. California. 



11. Entosphenus astori (Grd.) Gill. Oregon. 



3, — Petkomyzon LinnsBus. 1758. Lampreys. 



12. Fetromyzon marinus L. Eastern coast, ascending streams, {d. a. s.) 



(P. americanus Le Sueur.) 



ACIPENSEEID^. 

 4. — Acipenser Linn sens. 1758. Sturgeons. 



13. Acipenser rubicundus Le Sueur. Great Lakes and north. 



14. Acipenser maculosus Le Sueur. Mississippi Yalley. 



15. Acipenser transmontanus Rich. Columbia Eiver. 



5. — SCAPHiRHYNCHOPS Gill. 1876. Shovel-nose Sturgeon. 



{Scaphirhynchus Heckel — preoccupied in Ornitliology.) 



16. Scaphirhynchops platyrhynchus (Eaf.) Cope. Mississippi Yalley and 



southwest to the Eio Grande. 



POLYODOifTID^. 



6. — PoLYODON Lac6pede. 1798-. Duck-billed Cats. 



17. Polyodon folium Lac6p^de. Mississippi Yalley. 



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