PYCXODOXTTD^E. 
(including the caudal fin); head with opercular apparatus occupying 
somewhat more than one-quarter of the total length. Teeth and 
fins ajDparently as in the type species. 
This form was regarded by Agassiz, in his final description, as 
the young of P. platessus. It is here assigned to a distinct species 
on the authority of Heekel, who refers to three small specimens of 
P. platessus as showing the same proportions of the trunk as the 
typical adult. 
Form, Loc. Upper Eocene : N. Italy. 
P. 7459. Specimen 0*135 in length, displaying proportions of splenial 
teeth and remains of paired fins; Monte Bolca, near K 
Terona. ] fa**ekcm’d . N*-'' 
P. 1633-4. Two smaller specimens, the second imperfect dorsally 
and wanting the hinder half of the caudal region ; Monte 
Bolca. Egerton Colt. 
P. 4386. More imperfect fish showing the hollowed crown of the 
splenial teeth ; Monte Bolca. Enniskillen Coll. 
P. 1632, P. 3760. Small specimen, 0*06 in length, in counterpart; 
Monte Bolca. Egerton and Enniskillen Colls. 
I 
Pycnodus toliapicus* Agassiz. 
1839-44. Pycnodus toliapicus , L. Agassiz, Poiss. Foss. vol. ii. pt. ii. 
p. 196, pi. lxxii. a. fig. 55. 
1877. Pycnodus toliapicus , Sir P. Egerton, Geol. Mag. [2] vol. iv. p. 53. 
Type. Imperfect splenial dentition ; Osford Museum. L/eo^r- 
A large species, known only by the splenial dentition. Teeth of 
inner or principal series on the splenial bone attaining a width 
more than twice as great as their length, equalling the two flank¬ 
ing series in breadth and the latter almost in the same plane; teeth 
of second series considerably broader than long, with rugose and 
slightly indented crown: those of the outer series smaller, nearly 
as long as broad, similarly rugose and indented. 
Form. Sf Loc. Lower Eocene : London Basin. ? 
38825-26. Splenial dentition, imperfect and abnormal on the left 
side, the anterior principal teeth being subdivided into 
small teeth ; London Clay, Isle of Sheppey. This specimen 
is described by Egerton, loc. cit. p. 53. Boiverbank Coll. 
ZZ. 12 (Cracherode Catalogue). Smaller left splenial dentition ; 
Sheppey. Cracherode Bequest. 
