458 
ACTINOPTKRYGII. 
19114. Smaller head, less distorted, showing most of the principal 
characters ; Sheppey. The three anterior vortobral centra 
are shown in position. 
Presented by Rev. F. W. Hope, 1845. 
P. 1750. Imperfect head, partly decaying, showing the jaws and 
the bases of the clustered minute teeth on the premaxillse ; 
Sheppey. Egerton Coll . 
There seem to be no satisfactory characters by which the 
following specimens, from the London Clay of Sheppey, can be 
generically separated from Eothynnus : — 
38900. Imperfect head with opercular apparatus, deeper than in 
E. salmoneus, Bowerbctnk Coll. 
P. 629. Small imperfect head, similarly deepened, marked by 
Egerton as intended to be the type specimen of Rhonchus 
carangoules, Agassiz (named in list in ltep. Brit. Assoc. 
1844 [1845], p. 308) \ Egerton Coll. 
P- 9454. Hinder part of similar small head. Egerton Coll. 
P. 1744. Hinder portion of larger head with remains of opercular 
apparatus, marked “ Rhonchus n.s.” by Egerton. 
Egerton Coll. 
35057. Hinder portion of similar head with opercular apparatus. 
Purchased, 1861. 
P. 628. Hinder portion of cranium, apparently with crests worn 
away, marked by Egerton as intended to be the type 
specimen of Phalacrus cybioides, Agassiz (named in list 
in Rep. Brit. Assoc. 1844 [1845], p. 308). Egerton Coll. 
To Eothynnus may also probably be referred the vertebra; from the 
London Clay of Sheppey in the Royal College of Surgeons, named 
Thynnus toliapicus, R. Owen, Catal. Foss, ltept. & Pisces (1854), 
p. 174, no. 697. The following are similar specimens : — 
36117. Three terminal caudal vertebrcc ; London Clay, Sheppey. 
Purchased, 1861. 
38885. Three caudal vertebrae ; Sheppey. Bowerbanlc Coll. 
P. 4300 a, P. 4301. Three caudal vertebra; ; Sheppey. 
Enniskillen Coll. 
' Apparently the same as a specimen in the Royal College of Surgeons, 
named Cariniccps compressus, R. Owon, Catal. Foss. Rept. & Pisces (1854), 
p. 165, no. 663. 
