ROOM V. LEPIDOIDS. 427 



In Tetragonolepis the teeth are pointed, and not crenated 

 at the apex, as in Dapedius. 1 



LIGJJ. 86. DAPEDIUS; OF THE LIAS. (i not. size.) 



These common liassic Ichthyolites must be familiar to the 

 intelligent visitor, as their form and structure are illustrated 

 in Dr. Buckland's "Bridgewater Treatise." I would merely 

 direct attention to the perfect state of some of the specimens 

 in the Case before us. 



Lepidotus. Wall-cases A. B. (4, 5.) This genus of homo- 

 cereal lepidoids comprises nearly thirty species, which were, 

 for the most part, inhabitants of the liassic and oolitic seas. 

 A few species existed during the deposition of the Cretaceous 

 deposits ; and one solitary type, the last of the race, according 

 to our present knowledge, witnessed the dawn of the tertiary 

 system. There are many beautiful specimens in the collection 

 of the common Liassic, Oolitic, and Wealden species. 



The separate scales and teeth of the lepidoti that frequented 

 the estuaries and rivers of the Country of the Iguanodon, are 

 abundant in the limestones of Swanage, and in the clays and 

 calcareous grits and sandstones of Tilgate Forest. 2 In the angle 

 of Cases A and B, there are several examples, more or less per- 

 fect, of Lepidotus Fittoniand L. Mantelli, formerly in my col- 



1 " Poissons Fossiles," tome ii. p. 181. 



2 They were first collected, figured, and described by me, in " Foss. 

 Tilg. Forest," PI. V. & X. See also " Wonders of Geology," p. 407 ; 

 (i Medals of Creation," p. 639, PI. VI. fig. 10. 



