PYCNODONTIDiE. 
249 
Type. Nearly complete fish. 
The type species, attaining a length of about 0'08. Maximum 
depth of trunk about equal to its length from the scapular arch to 
the base of the caudal fin, and head with opercular apparatus 
occupying somewhat less than one-third of the total length of the 
fish; arched dorsal contour sharply bent just in advance of the fin. 
External bones closely but coarsely tuberculated, in part reticulated; 
all the teeth finely crenulated round the margin of the coronal 
indentation. Dorsal fin comprising about 36 rays, and its maximum 
elevation not equalling more than one-fourth of the depth of the 
trunk at its insertion; anal fin with about 30 rays. Badge-scales 
finely serrated. 
Form. <Sf Log. Upper Jurassic : S. Italy. 
18600. Slab with two typical specimens; Torre d’Orlando, near 
Naples. Purchased , 1844. 
23152. Slab with three specimens, in counterpart; Torre d’Orlando. 
Presented by Major Macdonald , 1849. 
43451. Slab with two specimens, showing part of the dentition ; 
Torre d’Orlando. 
Presented by Kenneth Murchison , Esq., 1872. 
39775. Small fish showing part of the dentition ; Torre d’Orlando. 
Purchased , 1862. 
P. 1670-73. Four specimens; Torre d’Orlando. Egerton Coll. 
P. 7457. A comparatively elongated fish ; Torre d’Orlando. 
Genus CCELODUS, Heckel'. 
[Denkschr. k. Akad. Wiss., math.-naturw. Cl. vol. xi. 1856, p. 202.] 
Syn. Glossodus, O. G. Costa, Atti Accad. Pontan. vol. vii. 1853, p. 26. 
C.osmodus, H. E. Sanvage, Bull. Soc. Sci. Nat. Yonne, vol. xxxiii. 
pt. ii. 1879, p. 48. 
Trunk very deeply fusiform, with slender abbreviated caudal 
pedicle. Head and opercular bones externally rugose and punctate ; 
most of the teeth exhibiting an apical indent with crenulated 
border; oral surface of vomer strongly convex from side to side, 
with teeth in five longitudinal series; splenial dentition comprising 
three series of teeth with long axes directly transverse, sometimes 
1 This name having gained universal acceptance, we adopt it, notwithstanding 
its preoccupation among Mammalia by Ccelodon, Lund, 1839 
