ICHTHYODORTJLITES. 
108 
I 
Ctenacanthus compressus , J. S. Newberry, Ann. New York Acad. 
Sci. vol. i. (1878), p. 191, and Palseoz. Fishes N. America 
(Mon. U.S. Geol. Surv. no. xvi. 1889), p. 168, pi. xxiii. 
fig. 4.—Cleveland Shale (Lower Carboniferous); Lorain Co., 
Ohio. [Columbia College, New York.] 
Ctenacanthus coocianus , St. John & Worthen, op. cit. vol. vii. 
p. 233, pi. xxi. fig. 1.—Keokuk Limestone ; Iowa. 
Ctenacanthus crenatus, F. M‘Coy, Brit. Palseoz. Foss. 1855, p. 624, 
pi. iii. i. fig. 31: Ctenacanthus crenulatus, L. Agassiz, Poiss. 
Foss. vol. iii. (1843), p. 177 (name only) ; J. AY. Davis, 
Trans. Boy. Dublin Soc. [2] vol. i. (1883), p. 345, pi. xlv. 
fig. 6.-—Lower Carboniferous Limestone ; Armagh, Ireland. 
[Woodwardian Museum, Cambridge.] 
Ctenacanthus cylindricus , J. S. Newberry, Palseoz. Fishes N. 
America (Mon. I T .S. Geol. Surv. no. xvi. 1889), p. 202, 
pi. xxvi. fig. 1.—Keokuk Limestone Shale ; Casey Co., 
Kentucky. 
Ctenacanthus cleflexus , St. John & Worthen, op. cit. vol. vii. 
p. 234, pi. xxii. fig. 1.—St. Louis Limestone; Illinois. 
Ctenacanthus elegans , M. Tuomey, Geol. Alabama (1858), p. 38, 
woodcut fig. A.—Lower Carboniferous : North Alabama. 
Ctenacanthus excavatus , St. John & Worthen, op. cit. vol. vi. 
p. 428, pi. xv. figs. 4, 5.—Keokuk Limestone; Iowa and 
Missouri. 
Ctenacanthus formosus , J. S. Newberry, Bep. Geol. Surv. Ohio, 
vol. i. pt. ii. (1873), p. 328, pi. xxxvi. fig. 2, .and ibid. 
vol. ii. pt. ii. (1875), p. 53, pi. lix. fig. 1.—Waverly Group ; 
Ohio and Kentucky. [Columbia College, New York.] 
Ctenacanthus fur dear inatus, J. S. Newberry, op. cit. vol. ii.pt. ii. 
p. 54, pi. lix. fig. 2.—Waverly Group; Kentucky. 
[Associated with teeth of Orodus variabilis. ] 
Ctenacanthus gemmatus , St. John & Worthen, c p. cit. vol, vi. 
p. 429, pi. xv. figs. 9, 10.—St. Louis Limestone; Illinois. 
Ctenacanthus grciclocostus, St. John & Worthen, op. cit. vol. vi. 
p. 425, pi. xv. figs. 2, 3.—Upper Burlington Limestone ; 
Iowa and Illinois. 
Ctenacanthus harrisoni , St. John & Yvorthen, op. cit. vol. vii. 
p. 236, pi. xxiii. fig. 1.—St. Louis Limestone; Illinois. 
Ctenacanthus heokule. St. John & Worthen, op. cit. vol. vi. p. 42/, 
pi. xv. fig. 8.—Keokuk Limestone ; Illinois, Iowa, and 
Missouri. 
Ctenacanthus littoni , J. S. Newberry, Palgeoz. Fishes N. America 
(Mon. U.S. Geol. Surv. no. xvi. 1889), p. 201, pi. xxv. 
fig. 3.—St. Louis Limestone ; St. Louis, Missouri. - 
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