96 0.0 Marsh — Notice of a New Fossil Sirenian. 



indications of at least twelve or fifteen, and perhaps more. 

 There were both upper and lower molar teeth of similar struct- 

 ure, but the rest of the dentition is unknown. 



One of the best preserved specimens found with these teeth 

 is a lumbar vertebra, which is noticeable for the extreme 

 flatness of its articular surfaces. The sides of the centrum 

 meet below, forming an obtuse median keel. The centrum of 

 this vertebra has a length of 89 mm ; the vertical diameter of the 

 anterior face is 90 mm , and its transverse diameter 107 mm . 



The known remains of this animal are from Alameda Co., 

 California, and are preserved in the museum of Tale College. 

 The type specimen was found by Dr. L. Gr. Yates. 



The nearest affinities of this peculiar Sirenian are probably 

 with Metataxytherium of Christol, from the Tertiary of Europe, 

 and its nearest living allies may, perhaps, be found in the genus 

 Halicore. 



Tale College, New Haven, Conn., Dec. 23, 1887. 



