568 
ACTINOPTEETGII. 
vi. no. 4 (1885), p. 5, figs. 3-5.—Upper Eocene ; Monte 
Bolca. [Imperfect fish; Geological Museum, University 
of Padua.] 
Genus ACAN’^HODERMA, Agassiz. 
[Poiss. Poss. vol. ii. pt. ii. 1844, p. 251.] 
A supposed extinct genus, not yet clearly distinguislied from the 
existing Balistes. [Teeth unknown.] Pectoral fins very small; large 
pelvic bone without fins or spine; one large dorsal spine, followed 
by about two very small and comparatively slender spines ; posterior 
dorsal and anal fins low and much extended; caudal fin rounded. 
Dorsal tubercles small and shagreen-like, apparently none en¬ 
larged. 
The name Acanthoclerma was preoccupied by Cantraine in 1835, 
but may be retained until the extinct species placed here is satis¬ 
factorily known. 
Acanthoderma spinosum, Agassiz. 
1842-44. Acanthoderma spinosum, L. Agassiz, Poiss. Foss. vol. ii. pt. ii. 
p. 252, pi. Ixxv. fig. 4. 
1842-44. Acanthoderrna ovale, L. Agassiz, tom. cit. pt. ii. p. 251, 
pl. Isxv. fig. 3. [Distorted fish ; Neucbatel Museum.] 
1879. Acanthoderma orbicidatum, 0. Heer, Urwelt d. Schweiz, ed. 2, 
p. 257, with fig. [Distorted fish ; Glams Museum.] 
1886. Acanthoderma spinosum, A. Wettstein, Fiscbfauna Tertiaer. 
Glamerscbief. (Denkscbr. scbweiz. Palaeont. Ges. vol. xiii.), p. 49. 
Type. Imperfect fish ; British Museum. 
The type species, attaining a length of about 0-12. Maximum 
depth of trunk equalling length of vertebral column, which seems 
to comprise 17 vertebrae. Large dorsal spine with a row of large 
tubercles along its anterior border, partly ribbed, partly tuberculated 
on its sides. Posterior dorsal fin occupying half of back, with 20 
to 25 rays; anal fin shorter and apparently with fewer rays. 
Form. ^ Log. Oligocene : Canton Glarus, Switzerland. 
P. 500, P. 3973. Imperfect type specimen, in counterpart, de¬ 
scribed and figured by Agassiz, loc. cit .; Engi. There are 
indications of one or perhaps two very small spines 
behind the large dorsal spine. 
Egerton Enniskillen Colls. 
Scattered but well-preserved remains of fish; Engi. A 
