COTTID.E. XCV. 245 



Head 3 in. length; depth 5; width of head 3; P. 

 reaching beyond beginning of soft dorsal to anal; pre- 

 opercle with a stout erect spine and two smaller ones 

 below; mouth wide; lateral line very distinct, chain-like, 

 sometimes vanishing behind, and sometimes not ! 

 Grayish, mottled, three cross-blotches on back; D. VI 

 to VIII 16; A. 12 or 13; V. 1, 4. N. C. to Ohio, Tenn., 

 and Ind., abounding in many of the streams issuing from 

 the caves in the limestone region; the largest species of 

 the genus, reaching a length of 6 inches. (C. meridion- 

 alis, Grd. P. caroling, Gill.) 



2. P. richardsonii, (Ag.) Jordan. LAKE SUPEKIOR 

 MILLER S THUMB. Pectorals shorter than head, scarcely 

 reaching second dorsal; depth 6 in total length; head 

 4; eye 5 in head; D. VIII 18; A. 14. L. Superior; 

 one of the larger species. (G. alvordi, Grd., from L. 

 Huron, &quot; the smallest species &quot; is said to be stouter 

 (depth 5) and to have the pectorals longer.) 



3. P. bairdii, (Girard) Jordan. BAIRD S BULL-HEAD. 

 Pectorals long, reaching beyond beginning of anal; 

 depth 6 to 6-|- in total length; spinous dorsal very low, 

 with a black bar; head 4^ in length; eye 4 in head; 

 D. VI to VII 16; A. 13. Mahoning R., Ohio; Baraboo 

 R., Wis. (Bu7idy\ etc. \C. wilsoni^ (Grd.) from the 

 Allegany R. is similar, but is said to have the spinous 

 dorsal higher, and the upper rays of the pectorals 

 branched. IT. spilota, Cope, from Grand Rapids, Mich., 

 is similar but stouter, and D. VIII 17.] 



3. TRIG LOPS IS, Girard. LAKE SCULPINS. 



= Ptyonotus, Giinther. 



1. T. thorn psoni, Grd. DEEP WATER LAKE SCULPIN. 

 Body elongated; depth 7 in total length; head 3-|-; eyes 

 very large, 4 in. head; D. VI 18; A. 15. Great Lakes 



