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Genus TRIGONODON, Sismonda. 
[Mem. R. Accad. Sci. Torino (2) vol. x. 1849, p. 25.] 
A genus known only by the front teeth, which are trenchant like 
those of Sargus but much broader and perhaps only in one pair. 
Trigonodon oweni, Sismonda. 
1849. Trigonodon oweni, E. Sismonda, loc. cit. p. 25, pi. i. figs. 14 -16. 
1858. Sargus sioni, M. Rouault, Comptes Rendus, Yol. xlvii. p. 100. 
1874. Scarus baltringensis, J. Probst, AYiirtt. Jahresh. yoI. xxx. p. 282 
(in part), pi. iii. figs. 10, 11 {non figs. 7-9). 
1875. Sargus sioni, H. E. Sauvage, Bull. Soc. G 60 I. France [3] vol. iii. 
p. 632, pi. xxii. figs. 3, 4. 
1879. Sargus sioni, F. Bassani, Atti Soc. Yeneto-Trent. Sci. Nat. vol. vi. 
p. 49, pi. Y. figs. 13,14. 
1882. Sai'gus sioni, H. E. Sauvage, Mem. Soc. Sci. Nat. Scione-et-Loire, 
Yol. iv. p. 63. 
1890. Scarus oiveni, F. Sacco, Bell. Soc. GeoL Ital. vol. ix. p. 296. 
1895. Sargus {Trigonodon') oiceni, F. Bassani, Atti R. Accad. Sci, 
Napoli [2] vol. vii. no. 7, p. 6 , fig. 3. 
1896. Sargus oweni, G. de Alessandri, Mem. R. Accad. Sci. Torino [2] 
vol. xlv. p. 289, pi. i. fig. 27. 
1897. Trigonodon oweni, G. de Alessandri, Mem. Soc. Ital. Sci. Nat. 
n. s. vol. vi. no. 1, p. 25. 
Type. \Yorn tooth. 
The type species, with a rather wstout cutting-tooth, which is high 
in front, becoming rapidly low behind, and not serrated or crimped 
on the trenchant border, but sometimes with slight vertical folds at 
the base of its inner face. 
Form. ^ Loc. Mioeene: Italy, \Yiirtemberg, and Brittany.. ^, 
Pliocene: Tuscany. /y^eu^cu^ . u/, 
F. 9467. Tooth 0*017 in length, not much worn ; locality unknown. 
History unlcnoiun. 
P. 5525. Plaster casts of two teeth ; Pliocene, Tuscany. 
Presented hy Prof. G. Cajoellhii, 1888. ^ 
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/TO-Trigonodon serratus (Gervais). ^ 
1852. Sargus? serratus, P. Gervais, Zool. et Pal. Fran 9 ., Poiss. Foss, 
p. 2 , pi. Ixvii. fig. 7 {non fig. 8 ). 
1891. Trigonodon serratus, A. S. Woodward, Geol. Mag. [31 vol. viii. 
p. 109, pi. iii. fig. 6 . 
Type. Anterior tooth. 
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