SEMIOXOTIDiE. 
77 
It is not improbable, that tbe following species is also correctly 
placed here :— 
Lepidotus triasicus, F. Bassani, Atti Soc. Ital. Sci. Nat. vol. xxix. 
(1886), p. 38.—Keuper; Besano, Lombardy. [Hinder 
portion of trunk ; Milan Museum.] 
To this genus may also perhaps be referred the detached teeth 
from the Keuper of Tubingen, Wiirtemberg, bearing the undefined 
name of Pycnoclus prisons (L. Agassiz, Poiss. Foss. vol. ii. pt. ii. 
1844, p. 199), and others described as SpTicerodus annularis (L. 
Agassiz, ibid. p. 211, pi. lxxiii. figs. 95-100). The origin of the 
latter is uncertain. 
The indefinable genus Cenchrodus (H. von Meyer, Neues Jahrb. 
1847, p. 574), founded upon a dentigerous bone, may perhaps be 
related to Colobodus , but its affinities are uncertain. Two species 
are recognized from the Muschelkalk of Upper Silesia, namely, Cen- 
chrodus goepperti and C. ottoi (H. von Meyer, loo. cit. p. 574, and 
Palaeontogr. vol. i. 1851, pp. 243-247, pi. xxviii. figs. 18, 19). 
Genus JLBPlDOTtJS ? Agassiz. 
[Neues Jahrb. 1832, p. 145 ( Lepidotes ), and Poiss. Foss. vol. ii. 
pt. i. 1833, pp. 8, 233.] 
Syn. Lepidosaurus, H. von Meyer, Palfeologica, 1832, p. 208. 
SpJuerodus , L. Agassiz, Poiss. Foss. vol. ii. pt. i. 1833, p. 15 (in 
part). 
Scrobodus, G. von Miinster, Neues Jahrb. 1842, p. 38. 
Plesiodus, A. Wagner, Abh. k. bay. Akad. Wiss., math.-phys. Cl. 
vol. ix. 1863, p. 632. 
Prolepidotus, R. Michael, Zeitschr. deutsch. geol. Ges. vol. xlv. 
1893, p. 729. 
Trunk fusiform and only moderately compressed. Marginal 
teeth robust, styliform; inner teeth stouter, often tritoral but 
smooth; opercular apparatus well developed, with a narrow arched 
preoperculum, but with few branchiostegal rays, and the gular plate 
wanting. Ribs ossified. Fin-fulcra very large, present on all the 
fins, biserial. Paired fins small; dorsal and anal fins short and 
deep, the former opposed to the space between the latter and the 
pelvic fins; caudal fin slightly forked. Scales very robust, smooth 
or feebly ornamented ; flank-scales not much deeper than broad, 
with their wide overlapped margin produced forwards at the 
superior and inferior angles; scales of the ventral aspect nearly 
as deep as broad; dorsal and ventral ridge-scales usually incon¬ 
spicuous. 
