44 
ACTINOPTEEYGII. 
36635. An 'imperfect mandible identical in character -^ith that of 
no. 38566; Hailing. The left dentary, so far as pre- 
served, is shown of the natural size in PI. YII. tig. 2, 
while the middle portion of the right dentary is shown in 
tig. 2 a. The bone of each side is thus much distorted by 
crushing, while the lower border is complete only in part 
of the right ramus. Purchased^ 1862. 
3907D. Another imperfect right dentaiy, with incomplete lower 
border ; Lower Chalk, Burham, Kent. Bowerhanlc Coll. 
P. 6527. Portion of dentaries; Lower Chalk, Blue Bell Hill, Burham. 
Presented hy S. J. IlaivJcins, Esq., 1891. 
'P. 4299. Very small maxilla associated with hinder portion of 
cranium, doubtfully of this species ; Lower Chalk, Bur¬ 
ham. EnnisTcillen Coll. 
36138. Imperfect small maxillae and other associated fragments, 
also doubtfully of this species; Lower Chalk, Burham. 
Purchased, 1861. 
39087. Imperfect small right dentary, doubtfully of this species ; 
Bromley, Kent. Bowerhanh Coll. 
The following specimen probably belongs to a species of Pacliy- 
rliizodus :— 
P. 5659. Imperfect caudal region covered with large and thin 
cycloid scales, which are either smooth or only feebly 
marked with radiating striae ; Lower Chalk, Cuxton, Kent. 
The vertebral 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 :— 
Pacliyrhizodus caninus, E. D. Cope, Proc. Amer. Phil. Soc. vol. xii. 
(1872), p. 344, and Vert. Cret. Porm. IVest (Eep. H.S. 
Geol. Surv. Territ. vol. ii. 1875), p. 221, 1. figs. 1-4 ; 
P. B. Loomis, Palaeontogr. vol. xlvi. (1900), p. 262, 
pl.xxvii.figs. 10-12.—Upper Cretaceous (KiobraraGroup); 
Smoky Hill Eiver, Kansas. 
Pacliyrhizodus curvatus, P. B. Loomis, Palaeontogr. vol. xlvi. 
(1900), p. 265, pi. XXV. figs. 6-8.—Upper Cretaceous; 
