RHTZ0D0NTID2E. 
343 
1877. JRhizodus Mbberti, E. H. Traquair, Ann. Mag. Nat. Hist. [4] 
vol. xix. p. 303, and Proc. Eoy. Soc. Edinb. vol. ix. p. 058. 
(P) 1881. Rhizodiis, T. Stock, Geol. Mag. [2] yol. yiii. p. 77, and Trans. 
Edinb. Geol. Soc. yol. iy. 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. <J' Log. Calciferous Sandstones and Carboniferous Lime¬ 
stone Series: South Scotland. Eedesdale 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, 
Joe. cit. Purchased. 
21975 a. Portion of right dentary, with the anterior large tooth. 
Purchased , 1848. 
39462. Imperfect right mandibular ramus. BowerbanJc 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. 
