86 
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. MARSIPOBRANCHIL. 
(Tue Myzonts.) 
Order XII. HYPE ROARTIA. 
Family XXVII. PETROMYZONTIDAS (Tue Lampreys.) 
Genus 70. IcutHyomyzon, Girard. 
SILVERY LAMPREYS. 
131. Ichthyomyzon argenteus, Kirt.—Sinvery Lamprey. 
(Bul. II, 70; Ammocetes argenteus, Ammoceetes hirudo.) : 
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. Ammocates, Dumeril. 
Brook LAMPREYS. 
SmaLL Buack LAMPREY. 
j 
| 
A small species, Which we have found only in small streams - 
the northern part of the State. - Especially abundant in spring, at the 
spawning season. ; 
SUMMARY AND CONCLUSION. - 
The especial characteristics of the fish fauna of the State as dis- 
tinguished from other zodlogical areas, are the preéminence of the) 
Catostomide and the Siluride, (the suckers and the cat- fishes), and. 
of the sunfishes, darters and minnows. The shovel-fish, the vari- 
ous 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 extending 
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 muskallunge and 
the burbot. 
Numericat Data. 
It will be seen that the fishes of Illinois, as shown by this list, 
represent 132 species, which are here distributed among 71 gener 
and 27 families. | 
