268 PROTOROSAURUS, 



\\3.Cladeiodon.{\) — In the new red sandstone (Keuper?) of War- 

 wick and Leamington, detached teeth occur of the size and form repre- 

 sented in PI. 62 A, fig. 4, tt & & ; they have been found in the same 

 quarries as those containing the remains of the Lahyrintliodon. In 

 their compressed form, anterior and posterior serrated edges, sharp 

 points, and microscopic structure, these teeth agree with those of the 

 Saurian reptiles of the Bristol conglomerate. In their breadth, as 

 compared with their length and thickness, they are intermediate 

 between the Thecodontosaurus and the Palcsosaurus platyodon ; they are 

 also larger and more recurved, and thus more nearly approach the 

 form characteristic of the teeth of the Megalosaurus. From these 

 teeth, however, they differ in their greater degree of compression, 

 and in a slight contraction of the base of the crown ; I propose, 

 therefore, to indicate the genus, of which, as yet, only the teeth are 

 known, by the name of Cladeiodon, and for the species from the 

 Warwickshire sandstones the name of Cladeiodon Lloydii, in testimony 

 of the friendly aid of Dr. Lloyd of Leamington, to whose exertions 1 

 owe the materials for the description of the teeth of the present genus, 

 and the still more remarkable ones of the British species of Laby- 

 rinthodon, with which the teeth of the Cladeiodon are associated. 



PROTOROSAURUS. 



114. In the pyritic schists of Thuringia, which, Hke the dolomitic 

 Breccia near Bristol, rank as the oldest member of the new- red- 

 sandstone system, the fossil remains of a small species of Saurian 

 reptile have long been known to occur ; and it is from the individual 

 specimen of this ancient extinct species, first described by Spener as a 

 sort of crocodile in the Miscellanea Berolinensia for the year 1710, 

 that the observations on the dental system are here taken. 



It is well known that Cuvier, after an elaborate comparison of 

 the figures and descriptions of the Thuringian fossil Saurian by Spener, 

 Link, Swedenborg and Wachsmann, arrived at the conclusion that the 

 species was to be referred to the Monitors or Tupinambis.(2) 



(1) xXa^£wa>, to prune ; oisc, a tooth ; from the resemblance of the tooth to a pruning-knife. 



(2) On ne comptera done plus les animaux de Spener et de Link parmi les crocodiles, ou 



