EXTINCT AMPHIBIA OF NORTH AMERICA 69 
although it does not attain such proportions in the other known forms. 
The parietals are elongate and narrow. The pineal foramen is 
represented by its lateral edge and its position is about midway of 
the longitudinal diameter of the parietals. The supraoccipital 
is represented by its anterior border. It is narrow. As restored 
it may be too long. ‘The epiotic also is represented by an anterior 
portion and it shows this element to have the position and form which 
is typical of the form D. laevis. Such other of the cranial elements as 
are indicated are based on the relations discovered in D. laevis. 
The heavy line on the left of the drawing represents the outline of 
the portion preserved. ‘The skull, as restored, may be a little too 
long, and the shape of the horns is conjectural. In the orbit there 
are preserved two teeth showing longitudinal fluting. The longest 
tooth is about three millimeters. 
MEASUREMENTS OF THE SKULL OF Diceratosaurus robustus MOoDIE 
mm 
Mediandensthyor theskullMestimateds..10.0 825. 7c ses eee. 67 
iRosteriorawidthi ofthe skull estimated. .fn2e00 Wu. eee. 78 
Wen tngoimon bite yet apse Meret re tr eee nr seen wt as tan ca 18 
WaclEhvotforbitgartes ce. Gmc ami. Ma Week nila ulema Uva 12 
IEEnOtheOigpostonpitalme ravine Ohh wan ec le ee, can ccna 27 
Widthtotspostonbitalier gna thet) iit ow nein teeta wncastattn ls 14 
iengthyotplompesttoothtey wea. age. cual en ate ae te Me Glas 3 
Wiidithtofisametoothuatibases: cise wacko Sct it Bee oes dena. 15 
This specimen is from the coal mines of Linton, Ohio. It forms 
a part of the Newberry collection of the American Museum where it 
is No. 8,617 G. 
ICHTHYERPETON SQUAMOSUM sp. nov. 
The present species is based on well-preserved remains from the 
Linton, Ohio, beds. There are two specimens of the species pre- 
served on blocks of bituminous coal and they represent the greater 
length of the animal. ‘The species is located in the genus Ichthyer- 
peton, which was based by Huxley' on remains from the Coal- 
measures of Ireland (Fig. 16), on account of the character of the 
dermal covering which consists of small overlapping scales such as 
t Trans. Roy. Irish Acad., 1867, p. 351. 
