SBMI0N0TID-2E. 73 
1850. Lepidotus acutirostris, O. G. Costa, Atti Accad. Pontan. vol. v. 
p. 301, pi. viii. fig. 1 a. 
1850. Lepidotus gigcis, 0. G. Costa ( errore ), ibid. p. 308, pi. viii. fig. 3. 
1857. Lepidotus ? spinifer , C. Bellotti, in A. Stoppani, Studii Geol. e 
Paleont. Lombardia, p. 421. [Fragment; Milan Museum.] 
1862. Lepidotus acutirostris , 0. G. Costa, Atti P. Accad. Sci. Napoli, 
vol. vi. Append, pp. 17, 44, pi. vii. fig. 3. 
1862. Lepidotus sp., 0. G. Costa, ibid. pp. 20, 42, pi. ii. 
1862. Semionotus sp., 0. G. Costa, ibid. p. 43, pi. iii. 
1862. Semionotus curtulus , 0. G. Costa, ibid. pp. 20, 43, pi. iv. 
1862. Urocomus picenus , 0. G. Costa {errore'), ibid. pp. 27, 43, pi. vi. 
fig. 1 a a. 
1866. Lepidotus ornatus , P. Ivner, Sitzungsb. k. Akad. Wiss., matli.- 
naturw. Cl. vol. liv. pt. i. p. 313, pL f ii. 
1866. Lepidotus obesus, 0. G. Costa, Atti P. Accad. Sci. Napoli, vol. iii. 
no. 12, p. 4, pis. i., ii. 
1889. Semionotus spinifer, W. Deecke, Palasontogr. vol. xxxv. p. 136. 
1891. Lepidotus triumplinorum , A. de Zigno, Mem. P. Accad. Lincei, 
[4] vol. vii. p. 6, pi. i. [Nearly complete fisli; University of 
Padua.] 
1892. Lepidotus (Colobodus ?) ornatus , F. Bassani, Mem. Soc. Ital. Sci. 
[3] vol. ix. no. 3, p. 24. 
Type. Portions of fishes ; Stuttgart Museum. 
A species attaining a length of about 0’5. Trunk deeply fusiform, 
its maximum depth much greater than the length of the head with 
opercular apparatus, which occupies nearly one-quarter of the total 
length of the fish. External bones finely ornamented with tubercu- 
lations ; teeth smooth, not closely adpressed, those within the mouth 
oval or rounded. Pelvic fins arising opposite the origin of the dorsal 
fin, and much nearer to the anal than to the pectorals; dorsal fin 
with about 24 rays, the anal less than half as large and opposed to 
its hinder portion. Scales smooth, but those of the flanks, except in 
the hinder half of the caudal region, with long and conspicuous 
posterior digitations; principal flank-scales scarcely deeper than 
broad. 
Form. <$f Log. Upper Triassic : Tyrol; Italy. 
13444. Imperfect hinder portion of head with anterior portion of 
trunk ; Seefeld, Tyrol. The head and opercular bones, 
though very fragmentarjq exhibit the characteristic tuber- 
culations ; some of the circumorbital bones are distinct, 
and the large upwardly-directed anterior process of the 
suboperculum is conspicuous. There are traces of large 
postclavicular scales; and there are prominent fulcra on 
the anterior ray of the pectoral fin. Purchased , 1836. 
