﻿RHIZODONTID^. 357 



P. 4794. Dentary bone, forming the type specimen of Qanolodus 

 craggesii, Owen ; registered as obtained from Ruabon. 



Egerton Coll. 



P. 6247. Longitudinal section of jaw prepared for microscopical 

 examination ; the type specimen of Gastrodus propositus, 

 Owen ; Low Main Seam, Newsham, Northumberland. 



Presented by Sir RicMrd 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 ; 

 Hanley. 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. BarJcas, Esq., 1869. 



21421 a. Four scales, inner aspect ; Carluke, Lanarkshire. 



Purchased, 1847. 



41131. Scale, inner aspect ; Carluke. Bryson Coll. 



44148. Scale, outer aspect ; Newcastle-upon-Tyne. 



Purchased, 1873. 



44865. Impression of inner aspect of scale ; Pendleton, Manchester. 

 Presented by Benjamin Bright, Esq., 1873. 



P. 4583. Scale, inner aspect ; Ruabon. Enniskillen Coll. 



Rhizodopsis robusta, sp. nov. 



[Plate XVI. fig. 3.] 



I860. Rhizodus hibberti, F. Roemer (errorej, Zeitschr. deutsch. geol. 



Ges. vol. xvii. p. 272, pi. vf. figs. 2, 5 (?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 hoc. Coal-Measures : Glatz, Silesia. 



