CESTEACIONTIDiE. 
229 
Venvstodm temdcristutns, St. John & Worthen, op. dt. yol. vi. 
p. 348, pi. ix. figs. 19-24. — Keokuk Limestone ; Illinois, 
loyya, and Missouri. 
Venmtodvs varialilis, St. John & Worthen, op. cit. vol. vi. p. 346, 
pi. ix. figs. 7-14. — Burlington Limestone; Illinois and 
Iowa. 
(?) Cranodus zonatus, H. Trautschold, Nouv. Mem. Soc. Imp. 
Nat. Moscou, vol. xiv. (1879), p. .54, pi. vii. fig. 4.— Car- 
boniferous Limestone ; Government of Moscow, Russia. 
(?) Totnodug argutus, H. Trautschold, iom. cit. p. 55, pi. vii. fig. 8 : 
Oxgtomodus arguUis, II. Trautschold, Bull. Soc. Imp. Nat. 
Moscou, 1880, pt. ii. p. 140. — Carboniferous Limestone ; 
Government of Moscow, Russia. 
Other anterior teeth of Cochliodonts, from the Lower Car- 
boniferous of Russia, have also been described by Semenow & Mbller, 
Bull. Aead. Imp. Sci. St. Petersb. vol. vii. (1864), p. 234, pi. i. 
figs. 1-8, 10. 
To the Cocbliodontida; also may possibly bo assigned the small 
prehensile teeth described under the following names : — 
Peripleeirodvs eompressus, St. .John & Worthen, Pal. Illinois, 
vol. vi. (1875), p. 326, pi. viii. fig. 26. — St. Louis Lime- 
stone ; Illinois. 
Periplectrodus expansns, St. John & Worthen, tom. cit. p. 327, 
pi. viii. fig. 27. — Chester Limestone ; Illinois. 
Periplectrodus warreni, St. John & Worthen, tom. cit. p. 325, 
pi. viii. fig. 25. — Burlington Limestone ; Iowa. 
A single undetermined tooth from the Pliocene of Tuscany, 
certainly not Cochliodont, is described under the name of Udodus 
hriignond by R. Lawley, Nuovi Studi sopra ai Pesci, etc., Coiline 
Toscane (1876), p. 83; and an equally doubtful fossil from the 
Rhoetic of Stuttgart is named Cliomatodus sphenodisevs, Plion., in 
kfeyer & Plieningcr’s Beitr. Pal. Wiirttembergs(1844), p. 55. 
Family CESTRACIONTID^. 
Dorsal fins each armed with a spine, the first opposite to the 
space between the pectoral and pelvic fins. Teeth mostly obtuse, 
never fused into continuous plates ; several series simultaneously in 
function. 
No distinctive characteristics of value having yet been discovered, 
the so-called OEODoaTin.as and HiiionosTiiiiE are included in this 
family. 
