67 

 Family III. CHAMPSODELPHIim 1 



Beak of the skull much elongated ; symphysis of lower jaw two- 

 thirds the length of the entire ramus ; teeth strong, permanent, 

 numerously developed in both jaws. 



Genus CHAMPSODELPHIS, Grervais. 

 Teeth with roots thicker than the crowns. 



CHAMPSODELPHIS 1 MACEOGKENIUS, 2 



DelpJiinus macrogenius, Cuvier. 

 CJiampsodelpliis macrogenius, Grervais, Pictet. 



Is distinguished by the great length of the symphysis of- the lower 

 jaw, a peculiarity of structure only equalled by that of the sperm whale 

 of our days ; but the teeth being numerous and differently formed, pro- 

 hibit the association of these two cetals. The dolphins, included in 

 the family Platanistidse, possess the mandibular symphysis rather more 

 than half the length of the ramus, but Cuvier has shown that the con- 

 struction of the bones more nearly allies this species to the Delphinus 

 (Steno of Gray) rostratus, than to the Susu of the Granges. 



I may again be permitted to call attention to the fact that no existing 

 species of the genus Steno, the most remarkable one among the 

 Delphinidae for exhibiting in excess this peculiarity, possesses a man- 

 dibular symphysis which ever attains to more than one-third the entire 

 length of the ramus. 



CHAMPSODELPHIS 1 BoED^], Grervais. 



Is very similar to the foregoing, but found in a different locality. 



The remains of these two species were discovered in France, em- 

 bedded in the strata of the meiocene period ; an age which also pro- 

 duced, among other mammals, those of the Deinotherium, the 

 Zeuglodon (a carnivorous whale), and of the Halitherium (a Sirenian 

 animal). 



Genus AEKXNTCJS, H. de Meyer. 



Teeth slightly bent ; apices pointed ; roots nearly circular. 



AEIONIUS SEETATUS, H. de Meyer. 



Synonym DelpJiinus molassicus, Jaeger, Owen. 



Found at Wurtemburg, in the molasse, or soft tertiary sandstone of 

 the meiocene age. 



t ^ a kind of crocodile, and SeA^iy, dolphin in allusion to the elongated 

 form of the beak and formidable array of teeth. 

 2 fjuuep6s, long, and ytvvs, the chin. 



