RHIZODONTIDJE. 
357 
P. 4794. Dentary bone, forming the type specimen of Ganolodus 
craggesii , Owen ; registered as obtained from Ruabon. 
Egerton Coll. 
P. 6247. Longitudinal section of jaw prepared for microscopical 
examination ; the type specimen of Gastroclus prcepositus , 
Owen ; Low Main Seam, Newsham, Northumberland. 
Presented by Sir Richard Owen, K.C.B., 1890. 
30571. Extremity of tail of a large fish, showing the second dorsal, 
anal, and greater portion of the caudal fin ; Stanton-by- 
Dale. Purchased , 1856. 
P. 5198 a. Ventral scales and imperfect pectoral fins of a large fish ; 
Hanlev. Purchased, 1885. 
42261. Group of fragmentary scales and other remains; Bilston, 
Staffordshire. Baugh Coll. 
41633. Group of imperfect large scales; Newcastle-upon-Tyne. 
Presented by T. P. Barkas , Esq., 1869. 
21421 a. Eour scales, inner aspect; Carluke, Lanarkshire. 
Purchased, 1847. 
41131. Scale, inner aspect; Carluke. Bryson Coll. 
44148. Scale, outer aspect; Newcastle-upon-Tyne. 
Purchased, 1873. 
44885. Impression of inner aspect of scale; Pendleton, Manchester. 
Presented by Benjamin Bright , Esq., 1873. 
U 
P.4583. Scale, inner aspect; Ruabon. Enniskillen Coll. 
Rhizodopsis robnsta, sp. nov. 
[Plate XVI. fig. 3.] 
I860. Rliizodus hibherti , F. Roemer ( errore ), Zeitsckr. deutsch. geol. 
Ges. yoI. xvii. p. 272, pi. vi. figs. 2, 5 (P non figs. 1, 3). 
1866. Rhizodopsis, J. Young, Quart. Journ. Geol. Soc. vol. xxii. p. 598. 
Type. Scale ; British Museum. 
An imperfectly definable species, distinguished from the type by 
the more robust character of the squamation. The abraded exposed 
portion of each scale is marked by thick rounded ridges, concentric 
with the hinder free border, and sometimes nodose. 
The smaller scale and the tooth figured by Roemer pertain to this 
species; but the larger scales described and figured by the same 
author are more suggestive of those of Strepsodus. 
Form. Sf Loc. Coal-Measures: Glatz, Silesia. 
