CESTBACIOSTID^. 
279 
Genus ACRODUS, Agassiz. 
[Poiss. Foss. vol. iii. 1838, p. 139.] 
Syn. Sphenonchiis, L. Agassiz, tom. cit. 1843, p. 201 (in part). 
Thectodus, Meyer & Plieninger, Beitr. Pal. Wiirttembergf), 1844 
p. 116. ’ 
A genus only differing from Ihjhodus in the rounded, non-cuspidate 
character of the teeth. 
As in the case of Ilybodits, the species are arranged in stratigra- 
phical order ; and all determinations of dorsal fin-spines must be 
regarded as provisional. 
Acrodus gaillardoti, Agassiz. 
1837. Ao'odus gaillardoti, II. B. Geinitz (ex Agassiz, MS.), Beitr. 
Kennt. Tbiiring. Muschelkgeb. p. 21, pi. iii. fig. 5. 
1839. Aerodm gaillardoti, L. Agassiz, Poiss. Foss. vol. iii. p. 146, 
pi. xxii. figs. 16-20. 
1839. Acrodite bratmii, L. Agassiz, tom. cit. p. 147, pi. xxii. fig. 26. 
1849. Aerodm gaillardoti, II. von Meyer, Palaeontogr. vol. i. p. 229, 
pi. xxviii figs. 3-8, 12, 13. 
1849. Aerodm bratmii, II. von Meyer, he. cit. p. 231, pi. xxviii. 
figs. 1, 2. 
1862. Aerodm gaillardoti, P. Gervais, Zool. et Pal. Fran^., Explic. PI. 
Poissons Foss. p. 13, pi. Ixxvii. tig. 14. 
1856. Aerodm gaillardoti, C. Giebel, Zeitschr. gesammt. Naturw. 
vol. viii. p. 428. 
1857. Aerodm gaillardoti, C. Chop, Zeitschr. gesammt. Naturw. vol. ix. 
p. 130. 
(? J 1859. Aerodm gaillardoti, K. von Schauroth, Sitzungsb. k. Akad. 
IViss. matb.-iiaturw. Cl. vol. xxxiv. p. 350, pi. iii. tig. 21. 
1861. Aerodm gaillardoti, E. E. Schmid, Nova Acta Acad. Cses. Leop.- 
Car. vol. xxix. no. 0, p. 10, pi. ii. tigs. 29-32. 
1865. Aerodm gaillardoti, II. Eck, Form. bunt. Sandst. u. Muschelk. 
Oberschlesieu, p. 116. 
1870. Aerodm gaillardoti, F. Roemer, Geol. von Oberschlesien, pi. xii 
fig. 10. 
1880. Aerodm gaillardoti, T. C. Winkler, Archiv. Mus. Teyler, vol. v. 
livr. 2, p. 109, pi. V. figs. 1-3. 
1883. Aerodm gaillardoti, II. E. Sauvage, Bull. Soc. Gdol. France, [3] 
vol. xi. p. 494, pi. xii. tig. 4. 
Type. Detached teeth. 
A species of moderate size, the principal teeth not measuring 
more than 0'035 in length, gently rounded, marked by numerous 
fine branching and bifurcating wrinkles. Anterior teeth slightly 
keeled, not much elevated. 
