ADDENDA AND ERRATA. 



Onpage757for"Genn8 2. Scolecosoma. Girard ; " read " Genns 2. Ichthyomyzon. Girard." 



The proper type of Ichthyomyzon is Petromyzon argentews Kirtl. ; Scolecosoma was based 

 on the young of the same species. 



On page 757 for "2. Scolecosoma argenteum (Kirtland) Jordan ; " read " lohihyomyzon ar- 

 genteus (Kirtland) Girard. 



On page 764 for "3. Folyodon folium Lacepede;" read "3. Polyodon spatJmla (Wal- 

 baum) Jordan;" and add to the synonymy, " Squalus spatkula Walbaum, Artedi 

 Piscium, 1792, 522." 



On page 781 for " 11. Anguilla vulgaris Turton ; " read " 11. Anguilla rostrata (LeSuenr) 

 DeKay." 



The American Eel seems to be a distinct species from the Common Eel 

 of Europe. The following graphic description of its habits is from the 

 pen of Mr. Wm. H. Ballou, of Chicago : 



" They are among the most voracious of carnivorous fishes. They eat most inland 

 fishes except the Gar-fish and the Chub. Investigation of six hundred stomachs by 

 Oswego fishermen showed that the latter bony fish never had a place on their bill of 

 fare. They are particularly fond of game fishes, and show the delicate taste of a con- 

 noisseur in their selections from choice Trout, Bass, Pickerel, and Shad. They fear not 

 to attack any object when disposed, and their bite on haman flesh shows even a vicious 

 attitude towards man. On their hunting excursions they overturn huge and small stones 

 alike, working for hours if necessary, beneath which they find species of Shrimp and 

 Cray fish, of which they are exceedingly fond. Their noses are poked into every imagin- 

 able hole in their search for food, to the terror of innumerable small fishes. 



"Eels are to the water what the fish-hawk is to the air. They are among the most 

 powerful and rapid of swimmers. Again, they hide in the mud beneath some log or 

 overhanging rock, and dart out with tremendous fury on theirunsuspecting prey. They 

 attack the spawn of other fishes open-mouthed, and are even said to suck the eggs 

 from an impaled female. They fearlessly and rapidly dive head foremost in the mud- 

 disappearing in an instant. They are owl-like in their habits, committing their depre- 

 dations at night, 



" No fish is known to feed upon the grown Eel. Pickerel, Gar- fish and Bass are sup- 

 posed to devour the young fry." 



On page 817 for "39. Ca(ostomM« ieres CMitchill) LeSueur ;" read "39. Catostomus com- 

 mersonii (Lacepede) Jordan.'' 

 Note. — The present report was prepared by the writer and submitted by him to Pro- 

 fessor Newberry in the year 1878. The first part of the report, from page 735 to page 

 848, was printed during the summer of 1881, as originally written, the writer not seeing 



