278 
ACTINOPTERYGII. 
P. 4721. Well-preserved left splenial bone, with worn dentition ; 
Sheppey. Purchased , 1884. 
P. 3759. Smaller more abraded specimen; Sheppey. 
Enniskillen Coll . 
The following specimens probably pertain either to this species 
or to Pycnodus bowerbanki :— 
P. 610. Ethmo-vomerine region of skull with vomerine dentition, 
described and figured as the type specimen of Pycnodus 
pachyrhinus, Egerton, Geol. Mag. [2] vol. iv. 1877, p. 54, 
pi. iv. figs. 1,2; London Clay, Isle of Sheppey. The 
fragment of bone marked s in Egerton's figure is now 
wanting. Egerton Coll. 
P. 170. Portion of similar vomerine dentition, much worn; Sheppey. 
Purchased , 1880. 
Pycnodus koenigi (Agassiz). 
1839-44. Periodus koenigii , L. Agassiz, Poiss. Foss. vol. ii. pt. ii. p. 201, 
pi. lxxii. a. figs. 61, 62. 
1850. Periodus koenigii , F. Dixon, Geol. Sussex, p. 205, pi. x. fig. 13. 
1877. Periodus koenigii Pycnodus toliapicus, Sir P. Egerton, Geol. 
Mag. [2] vol. iv. p. 53. 
1890. Periodus koenigii—Pycmodus toliapicus , Woodward & Sherborn, 
Catal. Brit. Foss. Vertebrata, p. 173. 
Type. Bight splenial dentition ; British Museum. 
The type species of Periodus, known only b}^ the splenial dentition, 
which is now usually assigned to P. toliapicus. From the latter, 
however, it differs in the outer row of splenial teeth being tilted 
considerably at their outer border and in the relatively longer form 
of the teeth of the second series. 
Form. Sf Loc. Middle Eocene : Sussex; Belgium.^ t? 
25697. Type specimen; Bracklesham Beds, Bracklesham Bay, 
Sussex. Dixon Coll. 
42848. Imperfect left splenial, with worn dentition; St. Pierre a 
Gand. Van Breda Coll. 
P. 3752. Imperfect left splenial with dentition, perhaps an abnormal 
example of this species ; Bracklesham Beds, Bracklesham 
Bay. Enniskillen Coll. 
