262 
SIREXOIDEI. 
JtSagenodus vinslovi, E. D. Cope, Proc. Amer. Phil. Soc. vol. xvii. 
P- 192 (Ptyonodus) : Ceratodus vinslovii, E. D. 
Cope, Proc. Acad. Nat. Sci. Philad. 1875, p. 410.—Per¬ 
mian ; East Illinois. [The type species of Ptyonodus .] 
An imperfect specimen of Sagenodus , wanting the paired fins, 
from the Lower Permian of Bohemia, is named Ctenodus tardus , 
Frits eh., Fauna der Gaskohle, vol. ii. [1889), p. 93, pi. lxxx b. 
[Boyal Bohemian Museum.] 
Another head and abdominal region is named thus :_ 
Megapleuron rochei , A. Gaudry, Enchainements du Monde Animal, 
Eoss. Primaires (1883), p. 239, woodc. fig. 246 h— 
Permian ; Igornay, Saone-et-Loire. [Museum of Natural 
History, Paris.] 
A portion of the cranium of a species of Sagenodus, from the 
Coal-Measures of Linton, Ohio, is also named Ctenodus ohioensis , E.^ 
D. Cope, Ptep. Geol. Surv. Ohio, vol. ii. pt. ii. (1875), p. 410, 
pi. xl\. fig. 2 (erroneously assigned to an Amphibian, Leptophrcictus 
obsoletus , E. D. Cope, Proc. Acad. Nat. Sci. Philad. 1873, p. 341. 
and afterwards referred to Ctenodus , E. D. Cope, ibid. 1874, p. 91) • 
J. S. Newberry, Palaeoz. Fishes N. America (Mon. TJ.S. Geofi 
Surv. no. xvi. 1889), p. 226, woodc. fig. 3. With this may probably 
be con elated the teeth described as Ctenodus serratus , or perhaps 
C. reticulatas. 
The scales descubed as follows are also probably referable to 
Sagenodus :— 
Ctenodus trachylepis , A. Fritsch, Fauna der Gaskohle, vol. ii. 
(1888), p. 85, pi. lxxx. figs. 1—4.—Lower Permian* Nyran, 
^ Bohemia. [Ptoyal Bohemian Museum.] 
Rhizodus quadratics, J. S. Newberry, Bep. Geol. Survf Ohio, vol.i. 
pt. n. (1873), p. 343, pi. xxxix. fig. 8.—Coal-Measures; 
Linton, Ohio. [Columbia College, New York.] 
Rhizodus reticulatus, Newberry & Worthen, Pal. Illinois, vol. iv. 
(1870), p. 349, pi. iii. figs. 9, 13, 14 — Coal-Measures ; 
Illinois. ^ it ~ . 
_ • ovisw c ' 
An undetermined tooth from the Burdiehouse Limestone, either of 
this genus or Ctenodus , is named Ctenodus robertsoni, L. Agassiz, 
Poiss. Foss. vol. iii. (1843), p. 174. 
i As remarked by A. Fritsch (Fauna der Gaskohle, vol. ii. 1888, p. 65) the 
small rhombic scales assigned to this supposed distinct genus are those of a 
Pakeoniscid fish mingled with the skeleton. 
