272 
ACTINOPTERYGII. 
Palseobalistum ponsorti, Heckel. 
1856. Palceobalistum ponsortii, J. J. Heckel, Denksclir. k. Akad. 
Wiss., matli.-naturw. Cl. vol. xi. p. 236, pi. xi. figs. 1-15. 
Type. Nearly complete fish ; Court Museum, Yienna. 
A small species, attaining a length of about 0*2. Maximum depth 
of trunk equalling about three-quarters of the length of the head and 
trunk without caudal fin ; head with opercular apparatus occupying 
about one-quarter of the total length of the fish. Vertebral axis 
at origin of dorsal fin slightly above the middle of the trunk. 
Teeth of inner or principal series of mandible much broader than 
long ; those of the second series scarcely broader than long ; those 
of the outer series smaller and antero-posteriorly elongated. Dorsal 
and anal fins not acuminate in front, but gradually diminishing in 
height backwards ; the dorsal fin with 65 rays, occupying about 
two-thirds of the back, the anal fin with over 50 rays. Hinder 
margin of caudal fin slightly sinuous. Scales confined to the 
anterior half of the trunk in advance of the median fins. 
Form. <Sf Log. Upper Cretaceous : Marne, Prance. 
All the following specimens were obtained from the uppermost 
chalk of Mont Aime, near Chalons-sur-Marne, in association with 
“ Lates heberti .” 
28292 a. Pine specimen 0*107' in length, apparently not distorted, 
showing the paired fins. Purchased, 1851. 
28292. Twelve specimens variously preserved, the large ones frag¬ 
mentary and one small example much distorted. 
Purchased , 1851. 
P. 1638. Well-preserved fish 0*125 in length. Egerton Coll. 
Palseobalistum goedeli, Heckel. 
1856. Palceobalistum goedelii, J. J. Heckel, Denksclir. k. Akad. 
Wiss., matli.-naturw. Cl. vol. xi. p. 234, pi. ii. figs. 3-8. 
1887. Palceobalistum goedelii, J. W. Davis, Trans. Hoy. Dublin Soc. [2] 
vol. iii. p. 496, pi. xxii. 
1887. Palceobalistum ventralis, J. W. Davis, ibid. p. 499, pi. xxiii. 
[Distorted fish ; British Museum.] 
Type. Caudal portion of a fish ; Court Museum, Yienna. 
A large species, attaining a length of about 0*3. Maximum 
depth of trunk equalling about three-quarters of the length of tbe 
head and trunk without caudal fin ; head with opercular apparatus 
occupying considerably more than one-quarter of the total length of 
