GEOLOGICAL SOCIETY. 



85 



was not more than one-half the size of the S. land- 

 formis. 



In all these particulars of organization, both species 

 differ from the Ichthyosaurus and Plesiosaurus, and from 

 the Saurian order in general. 



The S. LeaniiSj we find., on comparison, to be cha- 

 racterized as a distinct species from the S. lanciformis, 

 by the greater acuteness of the teeth, by their greater 

 comparative length, but particularly by their curva- 

 ture ; they are also slightly compressed at their inner 

 face. 



In both descriptions of these different specimens, it 

 is stated that " the bodies of the teeth are placed close 

 together \" which would seem to imply that there exists 

 no "separate and distinct alveoli." But as the author 

 of the paper on the S. lantiformis was not privileged 

 to dissect the relic, he may have been mistaken in this 

 point, a question which he is willing to cede as one of 

 little importance in the present instance, as the state- 

 ment was only made to convey an idea of the close ap- 

 proximation of the bodies of the teeth. 



Dr. Hays would appear to entertain different opinions 

 on this point, and although he states that distinct alveoli 

 do exist in both specimens, yet has made a new genus 

 for his animal under the name u Saurodon," which he 

 subsequently altered to u Saurocephalus," and thus 

 appropriated to himself the labors of another without 

 acknowledgment, and dedicates the species to his friend 

 Mr. Lea, in the first place in the feminine gender at 

 page 476, "S. Lease;" but is notified of this amphibious 



