PLATE 27c. V. I. p. 281.
Fig. l. Fossil fish of the genus Microdon, in the family Pycnodonts. (Agassiz, Vol. l. Tab. G. fig. 3.)
Fig. 2. Os Vomer of Gyrodus umbilicatus, from the Great Oolite of Durrheim, in Baden. (Agassiz.)
Fig. 3. Os Vomer of Pycnodus trigonus, from Stones-field, Oxon. (Original.)