(51) 



144. X. cxilis, sp. nov. Slender Cat. Rare. Three specimens were 

 obtained in McLean county by Prof. Forbes, the only ones seen. These 

 specimens present the following characteristics : 



Head in length 4i ; depth 6.^ in length. Eye 4| in head. Dorsal I, 

 6; Anal 1, 5. Ventrals 8 or 9. Inter orbital space 3i in length of head. 

 Dorsal a trifle nearer snout than anal. From snout to dorsal Si in total 

 length. Dorsal as high as long, and If in head. Dorsal spine small, 3i in 

 head. Pectoral spine 2^ in head. Width of head H in length ; depth 2| 

 in length of head. Base of anal 1^ in head. 



FAMILY ANGUILLIDAE. 

 Genus Anguilla, Thunh.- 



145. A. vulgaris^ var. rostrata, (LeS.) Nelson. Common Eel. Occurs 

 in Lake Michigan and most of the larger streams through the state, but is 

 far from common anywhere. 



FAMILY AMIIDAE. 

 Genus Amia, Linn. 



146. A. calva, L. Dog Fish. Abundant throughout the state. 



FAMILY LEPIDOSTEIDAE. 

 Genus Lepidosteus, Lac. 



147. L. ossevs, (7>.) Ag. Grar Pike. This is far the most common 

 species in Lake Michigan and the Calumet river, where it is very abundant. 

 It also occurs throughout the state. 



148. L. plaii/stomus, Raf. Short-nosed Gar. Occurs through- 

 out the state, but is much more abundant in Illinois and south. 



Genus l/itholepisy Raf. 



149. L. arlamanteus, Raf. Alligator Gar. Common in the Ohio 

 and Mis.sissippi rivers, occasionally straying up smaller rivers into the in- 

 terior of the state. 



FAMILY POLYODONTIDAE. 

 Genus Polyodon^ Lac. 



150. P. folium, Lac. Duck-billed Cat. Common in central and 

 southern Illinois in the larger streams. Rare in the northern part of the 

 state. 



FAMILY ACIPENSERIDAE. 



Genus Acipenser, Linn. 



151. A. maculosns, LeS. Sturgeon. Very abundant in Lake Mich- 

 igan and the larger rivers throughout the state. 



152. A. rubicundus, Lf'lS. Ijake Sturgeon Very common in Lake 

 Michigan, ascending (Calumet river in winter. 



Genus ScapMrhynchops, Gill. 



153. S. platyrhynclius, (Raf.) Gill. Shovel-nosed Stui-geon. Com- 

 mon in the southern part of the state in the Ohio and Mississippi rivers. 



