﻿BHTZODONTIDJE. 343 



1877. Mhizodus hibberti, R. H. Traquair, Ann. Mag. Nat. Hist. [4] 

 vol. xix. p. 303, and Proc. Roy. Soe. Edinb. vol. ix. p. 058. 



(?) 1881. Rhizodus, T. Stock, GeoL Mag. [2] vol. viii. p. 77, and Trans. 

 Edinb. Geol. Soc. vol. iv. p. 38. 



Type. Portions of jaws with teeth ; olim Hibbert Collection. 



The type species, of very large size. Head and opercular bones 

 superficially tuberculated ; exposed area of scales also ornamented 

 with fine granules, confluent into short wavy ridges towards the 

 hinder margin ; clavicle and infraclavicle superficially ornamented 

 with delicate reticulating ridges and pits. 



Form. Af Loc. Calciferous Sandstones and Carboniferous Lime- 

 stone Series : South Scotland. Redesdale Ironstone : Northumber- 

 land. 



Unless otherwise stated, the following specimens were obtained 

 from the Blackband Ironstone (Lower Carboniferous Limestone) of 

 Gilmerton, near Edinburgh : — 



24337. Imperfect mandible associated with remains of jugular 

 plates, the right clavicle, and some stout fin-rays. Two 

 of the infradentary bones are distinct on the right side. 



Purchased, 1849. 



21222 a. Fragment of head showing three imperfect large mandi- 

 bular teeth, doubtfully of this species. Purchased, 1847. 



21222 b. Portions of mandible and jugular plates. 



Purchased, 1847. 



20707. Plaster cast of portions of mandible, figured by Owen, 

 loc. cit. Purchased. 



21975 a. Portion of right dentary, with the anterior large tooth. 



Purchased, 1848. 



39462. Imperfect right mandibular ramus. Bowerbanlc Coll. 



21222 C. Left mandibular ramus, displaying three of the large teeth. 



Purchased, 1847. 



40327. Anterior portion of right dentary with teeth. 



Purchased, 1867. 



47716. Imperfect left mandibular ramus, inner aspect, and other 

 remains. Presented by Dr. Lauder Lindsay, 1876. 



21222 d. Portions of mandible, the right dentary showing two 

 very large anterior teeth in close apposition. 



Purchased, 1847. 



