394 Geological Society. 



that the indications given by the galvanometer of the augmen- 

 tation or decrease of temperature in the furnace, always pre- 

 ceded the same indications from the mercurial thermometer 

 on the top. 



I am, dear Sir, yours very truly, 

 London, Oct. 20, 1841. Edward Solly, Jun. 



LX. Proceedings of Learned Societies. 



GEOLOGICAL SOCIETY. 

 [Continued from p. 325.] 



Feb. 24, A PAPER, entitled " Description of parts of the Skele- 

 1841 . •£*• ton and Teeth of five species of the genus Labyrintho- 

 don, from the new red sandstone of Coton End and Cubbington 

 Quarries ; with remarks on the probable identity of the Cheirotherium 

 with that genus of extinct Batrachians," by Richard Owen, Esq., 

 F.G.S., F.R.S. 



In a paper read on the 20th of January, Mr. Owen described the 

 peculiarities in the structure of the teeth of the Labyrinthodon (see 

 ante, p. 315) ; and having been favoured by Dr. Lloyd, since that 

 paper was written, with the loan of all the reptilian remains obtained 

 from the new red sandstone of Warwick and Leamington, deposited 

 in the Museums of those towns, and having been liberally per- 

 mitted by the Committees of the Institutions to examine the teeth 

 by the microscopic test, he gives, in this paper, a minutely detailed 

 description of the fragments submitted to his examination, and points 

 out their relative connexion to each other, and the laws by which 

 he has been enabled to determine that they all belong to the genus 

 Labyrinthodon, and [are] confirmatory of the Batrachian nature of 

 the Wurtemberg fossil. 



The specimens which Mr. Owen has examined are referable to 

 five species, to which he has applied the names, — 1. Labyrinthodon 

 salamandroides, 2. L. leptognathus, 3. L. pachygnathus, 4. L. ven- 

 tricosus, and 5. L. scutulatus ; and he describes successively the cha- 

 racters exhibited by the bones assignable to the 2nd, 3rd and 5th 

 species. 



Labyrinthodon leptognathus. — The remains which Mr. Owen con- 

 siders as portions of this species, consist of fragments of the upper 

 and lower jaws, two vertebrae, and a sternum. They were found in 

 the sandstone quarries at Coton End, near Warwick. 



The portions of the upper jaw show that the maxillary or facial 

 division of the skull was broad, much depressed and flattened, re- 

 sembling the skull of the gigantic Salamander and of the Alligator ; 

 and the outer surface of the bones was strongly sculptured, as in the 

 Crocodilian family, but of a relatively larger and coarser pattern. 

 The fragment described contains the anterior moiety of the single 

 row of small teeth, or 30 sockets, and the base of one of the great 

 anterior tusks. The bases of the serial teeth project directly from 



