48 GEOLOGICAL SURVEY OF TEXAS. 



tudinally grooved below. The vertebral scuta are considerably wider 

 than long, as is also the anal scutum. Both carapace and plastron are 

 very thin, not exceeding one-quarter inch in the specimen described, ex- 

 cept at the borders. 



Measurements . 



Length over all 4.2 feet 



Width over all 4 feet 



AVidth of penultimate dorsal scute 1.275 feet 



Length 85 feet 



AVidth of last vertebral scute ] .35 feet 



AVidth of anal scute 1.5 feet 



Length 6 feet 



Length of penultimate costal scute 9 feet 



Length of last costal 95 feet 



AA'^idth of lip of plastron at base 8 feet 



AVidth of anterior lobe at axilla?- 2 feet 



AVidth of posterior lobe of plastron at base 2 feet 



AVidth at fundus of median notch 1.1 feet 



AVidth at apices of angular processes 85 feet 



Depth of notch 5 feet 



This is the largest species of land tortoise yet known from North 

 America. 



