﻿262 SIRENOIDEI. 



Sagenodus vinslovi, E. D. Cope, Proc. Amer. Phil. Soc. vol. xvii. 

 (1878), 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, 

 A. Fritsch., Fauna der Gaskohle, vol. ii. (1889), p. 93, pi. lxxx b. 

 [Eoyal Bohemian Museum.] 



Another head and abdominal region is named thus : — 



Megapleuron rochet, A. Gaudry, Enchainements du Monde Animal, 



Foss. Primaires (1883), p. 239, woodc. fig. 246 \— 



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, Rep. Geol. Surv. Ohio, vol. ii. pt. ii. (1875), p. 410, 



pi. xlv. fig. 2 (erroneously assigned to an Amphibian, Leptophractus 



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, Palseoz. Fishes N. America (Mon. U.S. Geol, 



Surv. no. xvi. 1889), p. 226, woodc. fig. 3. With this may probably 



be correlated the teeth described as Ctenodus serratus, or perhaps 



C. reticulatus. 



The scales described 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 Permiau; Nyran, 



Bohemia. [Royal Bohemian Museum.] 

 Rhizodus quadratus, J. S. Newberry, Rep. Geol. Surv. Ohio, vol. i. 



pt. ii. (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. 



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. 



* As remarked by A. Fritsch (Fauna der Gaskohle, vol. ii. 1888, p. 65) the 

 8m all rhombic scales assigned to this supposed distinct genus are those of a 

 Pabeoniscid fish mingled with the skeleton. 



