GYMNonovrinj;. 
575 
pi. viii. fig. 13. Heptadioilon echinus, H. G. Bronn, Leth. 
Geogn. ed. 3, vol. iii. (1855), p. 677. — Upper Eocene; 
Monte Postale, X. Italy. [Type species of so-called 
Enneodon or Heptadiodon, showing no clear differences 
from Diodon. Imperfect fish ; Zigno Coll., University of 
Padua.] 
Diodon heterodon, A. Portis, loc. cit. 1889, p. 363. Gymnodws 
diodon, E. Delfortrie, Actcs Soc. Linn. Bordeaux, vol. 
xx viii, (1871), p. 233, pi. xii. fig. 54, Gymnodus 
heterodon, E. Delfortrie, ibid. p. 234, pi. xii. fig. 57.— 
Upper Miocene ; Gironde, Eranco. [Type species of so- 
called Gymnodus. Jaw.] 
Diodon hilgendorfi, A. Portis, loe. cit. 1889, p. 364. Progymnodon 
hilgendorfi, W. Dames, Sitzungsb. k. preuss. Akad. Wise., 
phys.-math. Cl. pt. i. 1883, p. 148, pi. iii. fig. 13. 
Lower Tertiary ; Birket-el-Qurun, Egypt. [Type species 
of so-called Progymnodon, with anterior dental plates in 
close contact with inner plates. Dental plates ; Boyal 
Museum of Natural History, Berlin.] 
Diodon incertus, E. Bassani, Atti 11. Acead. Sci. Aapoli [2] 
vol. ix. (1899), no. 13, p. 34, pi. iii. figs. 66-68. Phylhdus 
incertus , G. Michelotti, Rev. et Mag. /ool. vol. xiii. 
(1861), p. 355. Diodon rovasendcc, A. Portis, loc. cit. 
1889, p. 371, pi- x. figs. 9-13.— Upper Eocene; Pied- 
mont. [Dental plates.] 
Diodon italicus, G. de Alessandri, Mem. R. Accad. Sci. Torino [2] 
vol. xlv. (1896), p. 286, pi. i. fig. 23, and Mem. Soc. Ital. 
Sci. Nat. n. s. vol. vi. (1897), no. 1, p. 27, pi. i. fig- 5- 
Middle Miocene; S. Bartolomeo, Piedmont. [Dental 
plates ; Rovasenda CoBeetion.] 
Diodon meristodus, A. Portis, loc. cit. 1889, p. 365, pi. x. figs. 
3, 4.— Upper Eocene ; Gassino, Piedmont. [Dental plates.] 
Diodon monsegurensis, A. Portis, loc. cit. 1889, p. 363. Gymno- 
dus monsegurensis, E. Delfortrie, Actes Soc. Linn. 
Bordeaux, vol. xxviii. (1871), p. 236, pi. xii. fig. 64. 
Lower Miocene ; Gironde, Erance. [Imperfect jaw.] 
Diodon platyodus, A. Portis, loc. cit. 1889, p. 307, pi. x. figs. 5-8. 
—Middle Oligocene ; North Italy. [Dental plates; 
University of Rome.] 
Diodon stenodus, A. Portis, loc. cit. 1889, p. 376, pi. x. figs. 14, 15. 
— Lower Miocene ; Turin. [Ditto.] 
Diodon lenuispinus, L. Agassiz, Poiss. Eoss. vol. ii. (1833-44), 
pt. i. p. 17, pt. ii. p. 273, pi. Ixxiv. figs. 2, 3. Tetrodon 
