List of Plates, xiii 



Plate V. 



Variations of form and proportions in the loaf-scars of Lvpidodendron 

 cukalum, Sternb. See pages 77 to 91 of text. 



The same. 



The same. 



The same. 



The same. 



Plate VI. 



Plate VII. 



Plate VIII. 



Plate IX. 



Plate X. 



Variations of leaf-sears in certain species of Sigillaria, probably all re- 

 ferable to S. lep'idodendrifolia, Brongt. See pages 129 to 133 of text. 



Plate XI. 



Fig. A. Vdifera Gabbi, animal in motion. 

 B. " " shell. 



0. " " lingual dentition. 

 I). " " caudal mucus-pore. 



E. The same (?) shell. 



F. " lingual dentition. 



G. Small species of Helix, lingual dentition (the extreme 



marginal on a larger scale\ 

 H. Oryptostrakon Gabbi, animal in motion. 



1. " " jaw. 



J. " rudimentary shell. 



K. " " lingual dentition. 



L. Bidimulus Irazuensis, extreme lateral tooth. 



M. Tebennophorus sp. . animal. 



N. " lingual dentition. 



O. Limax semitectus ? animal. 



P. " " jaw. 



Q. " " lingual dentition. 



See page 202 of text. 



