95 



Sub-class PHYSOSTO.MI. 



Order III. APODES. 



The Eels. 



Family X. ANGuiLLiDiE. (The True Eels.) 



Genus 25. Anguilla, Thunberg. 



48. Anguilla rostrata, Le Sueur. — Common Eel. 



Not very abundant, but " occurring everywhere in streams of large 

 and moderate size, throughout Illinois. 



Order IV. HAPLOMI. 



Family XI ESOCID^. (The Pikes.) 



Genus 26. Eso::, L. 



49. Esox nohilior, Thompson. — Muskillunge. -^ "^^^ 

 Found by us only in Lake Michigan. 



50. Esox lucius, L. — Pike. 



Throughout the State, but most abundant northward. Occurs " 

 also in Lake Michigan. 



51. Esox vermiculatus, Le Sueur. — Little Pickerel. 

 (Bui. II, 53 ; Esox salmoncus, Esox cypho.) 



An abundant species north and south, occurring most commonly, 

 perhaps, in weedy lakes, but scarcely less frequent along weedy 

 margins of rivers and smaller streams. 



Family XII. UMBRID^. (The Mud Minnows.) 



Genus 27. Umbra, Miiller. 



52. Umbra limi, Kirt.— Mud Minnow. 



(Bui. II, 52 ; Melanura limi.) 



Lakes and muddy ponds in northern and southern Illinois ; not 

 taken by us in the central part of the State. Occurs occasionally 

 in running streams, as in Fox Kiver, at McHenry. 



Family XIII. CYPEINODONTID^. (The Toothed Minnows.) 



Genus 28. Gambusia, Poey. 



53. Gambusia patruelis, B. & G. 



(Bui. II, 52; Zifgonectes melanops: Synop., 340 and 89'2;Zygonectes 

 melanops, Zygonectes inurus.) 



A southern species, not collected by us north of White county. 

 Abundant in ponds and streams in the hill region of Southern Illi- 

 nois. 



