DERMATEMYDID&. 243 
is 92 mm. wide. Its extent front to back is 75 mm. Its hinder border is somewhat exca- 
vated for union with the first neural. The free borders of the three anterior peripherals 
measure each from 60 mm. to 65 mm. The height of the first is 65 mm.; that of the 
third, 83 mm. 
Fics. 302—304.—Adocus lacer. Entoplastron, xiphiplastron, and peripheral. 3. 
302. Entoplastron, left half. 303. Right xiphiplastron. 304. First left peripheral. 
The sulci separating the marginal scutes from the vertebral and the costals is not 
far above the free border of the bones. If there were a distinct nuchal scute it has been 
effaced by a slight injury to the bone. The first marginal is 25 mm. from front to back. 
The height of the ‘succeeding ones increases until that of the fourth is 4o mm. The first 
spy 
per t oO 
Fics. 305-307.—Adocus lacer.—Peripherals. 3. 
305. Ninth, tenth, and eleventh peripherals and part of suprapygal. 
306. Section near hinder end of ninth peripheral. 
307. Section of eleventh peripheral where it joined the pygal. 
vertebral scute has a width from side to side of 150 mm. It probably had the form found 
in A. punctatus. 
In the collection of the Philadelphia Academy there is a lot of bones of an Adocus which 
is referred to the present species. There are no data accompanying the specimens, but there 
