110 



Bros., a firm of fishermen at South Chicago, reported the capture 

 of a single specimen of this species in the Calumet River, probably 

 an emigrant by way of the canal. 



Class II. MARSIPOBRANCHII, 



(The Myzonts.) 



Order XII. HYPEROARTIA. 



Family XXVII. PETROMYZONTID.E. (The Lampreys.) 



Genus 70. Ichthyomyzon, Girard. 



Silvery Lampreys. 

 131. Ichthyomyzon argenteus, Kirt. — Silvery Lamprey. 



(Bui. II, 70; Ammoccctes argenteus, Ammocoetes hinido.) 



Collected by us chiefly in the Illinois and Ohio Rivers, attached 

 to shovel-fish, cat-fish, sturgeon, buffalo, and other large species, as 

 taken in the nets of the fishermen. 



Genus 71. Ammocgetes, Dumeril. 



Brook Lampreys. 



132 Ammocoetes niger, Raf. — Small Black Lamprey. 



A small species, which we have found only in small streams in , 

 the northern part of the State. Especially abundant in spring, at the j 

 spawning season. ' 



SUMMARY AND CONCLUSION. 



The especial characteristics of the fish fauna of the State as dis- 

 tinguished from other zoological areas, are the preeminence of the 

 Catostomidae and the SiluridiB, (the suckers and the cat-fishes,) and 

 of the sunfishes, darters, and minnows, the shovel fish and the various 

 species of gars, and the dog-fish, are likewise among the char- 

 acteristic features of our fauna, as is also the excessive abundance 

 of the hickory shad. 



The limited share of Illinois in Lake Michigan, not estendiug 

 into water of more than twelve or fifteen fathoms, gives us but a 

 small group of species peculiar to the great lakes; viz., the common 

 white fish, the lake herring, the lake trout, the muskalluuge, and 

 •the burbot. 



Nuimeric.vl Data. 



It will be seen that the fishes of Illinois, as shown by this list, 

 represent 132 species, which are here distributed among 71 genera 

 and '^7 families. 



