THE 



QUARTERLY JOURNAL 



OF 



rHE GEOLOGICAL SOCIETY OF LONDON. 



Vol. LXXV 



FOR 1919. 



1. On the Dentition of the Petalodont Shabk, Climaxoia h. 

 By Arthur Smith Woodward, LL.D., F.K.S., Pres. L. S.„ 

 F.G.S. (Read June 1th, 1919.) 



[Plate I.] 



The dentition of the Petalodont sharks is still very imperfectly 

 known. It has hitherto been satisfactorily observed only in the 

 highly-specialized Janassd bituminosa from the Upper Permian 

 ( Kupf erschief er and Marl Slate) of Germany and England. 1 

 Nearly all the other species and genera are represented in collec- 

 tions merely by isolated teeth. It is, therefore, of interest to 

 examine the comparatively well-preserved dentition of a new Lower 

 Carboniferous Petalodont, which has been kindly lent to me by 

 Dr. William Eagle Clarke, Keeper of the Natural History Depart- 

 ment of the Royal Scottish Museum, Edinburgh. The specimen 

 was obtained from the Calciferous Sandstone of Calderside, near 

 East Kilbride (Lanarkshire), and was presented to the Royal 

 Scottish Museum in 1892 by Mr. John B. Wise, of Glasgow. It 

 was regarded by the late Dr. R. H. Traquair as belonging to a 

 new species of Janassa, which he named J. wisei? but it has not 

 so far been described or discussed. 



The hard shale in which the two jaws are preserved has split 



1 A. Hancock & E. Howse, Ann. & Mag. Nat. Hist. ser. 4, vol. v (1870) 

 p. 47 & pis. ii-iii; O. Jsekel, Zeitschr. Deutsch. Geol. Gesellsch. vol. li 

 (1899) p. 259 & pis. xiv-xv. 



2 R. H. Traquair, Brit. Assoc. Handbook, Glasgow, 1901. p. 513 (name 

 only). 



Q. J. G. S. No. 297. b 



