44 
actinopterygii. 
36635. An imperfect mandible identical in character with that of 
no. 38566 ; Hailing. The left dentary, so far as p re ' 
served, is shown of the natural size in PI. VII. fig- 2 ’ 
while the middle portion of the right dentary is shown in 
fig. 2 a. The bone of each side is thus much distorted b) 
crushing, while the lower border is complete only in P ar ^ 
of the right ramus. Purchased, 1862- 
39079. Another imperfect right dentary, with incomplete lower 
border ; Lower Chalk, Burham, Kent. Bowerhank Coll- 
P. 6527. Portion of dentaries ; Lower Chalk, Blue Bell Hill, Burham. 
Presented by S. J. Hawkins, Esq., I 801, 
P.4299. "Very small maxilla associated with hinder portion 
cranium, doubtfully of this species ; Lower Chalk, Bur- 
ham - Enniskillen Coll- 
36138 . Imperfect small maxilla; and other associated fragments, 
also doubtfully of this Bpecies ; Lower Chalk, Burham. 
Purchased, 1861- 
39087. Imperfect small right dentary, doubtfully of this species; 
Bromley, Kent. Bowerhank Coll- 
The following specimen probably belongs to a species of Tachy- 
P. 5659. Imperfect caudal region covered with large and thin 
cycloid scales, which are either smooth or only fee bl I 
marked with radiating stri* ; Lower Chalk, Cuxton, K- eTlt - 
. 6 ver tebral centra are short and deep, without lateral 
pits. The rays of the caudal fin exhibit very close trans 
verse articulations. Harford Coll- 
Species not represented in the Collection have also been described 
on fragmentary evidence as follows 
^yrhizodus caninus, E. D. Cope, Proc. Amer. Phil. Soc. vol. *»• 
p. 344, and Vert. Cret. Eorm. West (Rep. U - b - 
pi S " rv ‘ Territ - vol. ii. 1875), p. 221, pi. 1. figs- 
■ H Loomis, Pabeontogr. vol. xlvi. (1900), P- ~ G '\ 
P • xxvii . figs. 1 0-12 , — TJ pper Cretaceous (N iobrara G roup ) , 
tw] 
Pachyrhizodus 
curvatus, F. B. Loomis, Palceontogr. vol. 
nnno\ ’ ijoomis, raiffiontogr. «"■ 
f ), p. 265, pi. xxv. figs. 6-8.— Upper Cretaceo® 
