908 



HISTORICAL GEOLOGYo 



1532. 



Zeuglodon, one of which, Z. cetoides, was nearly 70 feet long. One nearly 



perfect skeleton was found in place by S. B. Buckley in Clark County, Ala., 



about 100 miles north of Mobile, having the 

 length here stated. A^ertebrse were so abun- 

 dant, on the first discovery, in some places that 

 many of these Eocene whales must have been 

 stranded together, in a common catastrophe, 

 on the northern borders of the Mexican Gulf, 

 — possibly through a series of earthquake waves 

 of great violence ; or, by an elevation along the 

 sea limit that made a confined basin of the 

 border region, which the hot sun rendered de- 

 structive alike to Zeuglodons and their game ; 

 or, by an unusual retreat of the tide, which left 

 them dry and floundering for many hours under 

 a tropical sun. The Zeuglodon is the Basilosau- 

 ras of Harlan (1834), the Zeuglodon of Owen. 

 Some of the dorsal vertebrae have a length of a 

 foot and a half, and a diameter of a foot ; and 

 a rib, a length of nearly six feet. Fig. 1532 

 represents one of the molar teeth, the yoke-like 

 form of which suggested the name Zeuglodon, 



from C^vyXt], yoke, and 6Bov<;, tooth. Some of these teeth had a longer diameter 



of four and a half inches. 



Miocene. — The Miocene Ungulates were of different species from those 



of the Eocene, and mostly of different genera. 



Tooth of Zeuglodon cetoides (x §). D. 



1533. 



Titanotherium giganteum of Leidy (x ^). Kestoration by Scott and Osborn. 



In the earliest of the White River group, the Titanotherium beds, the 

 species include the gigantic Titanotheres ; new Horses of the genus Mesohip- 



