Cope.] 576 (Feb. 3, 
LEPTOPHRACTUS LINEOLATUS. Sp. nov. 
This large batrachian is represented by the middle portion of a cranium, 
including parts of both jaws with numerous teeth. It is not easy to deter- 
mine which of the tooth-bearing bones preserved is maxillary and which 
dentary, but the lighter and thinner of the two is presumably the latter, 
although it has the greatest vertical depth. The opposing bone supports 
two types of teeth, and as this is only the case in the maxillary of Lepto- 
phractus obsoletus, the present bone may be provisionally referred to that 
position. 
There is a great difference in the sizes of the two types of maxillary 
teeth, the larger having nearly three times the linear dimensions of the 
latter. The small ones are rather distantly placed, being separated by in- 
terspaces nearly equal to their lengths. They are cylindric at the base, but 
become compressed, and have two opposite cutting edges on the apical 
third. They are of rather slender form, and are striate at the base. The 
longer teeth have a similar form, but are less strongly compressed distally, 
where there are two opposite cutting edges. The basal portion is quite closely 
striate. These teeth are on a different basal line from the small ones, since 
when their bases are removed the latter appear behind them. Three smaller 
teeth stand: in the spaces between two large ones. 
The mandibular teeth are intermediate in size between the large and 
small ones of the maxillary series, having a little more than half the linear 
dimensions of the former. Their terminal three-fifths are compressed, and 
furnished with fore and aft cutting edges. 
The surface of the bone, where visible, does not display the punctate 
sculpture of that of the L. obsoletus, but is nearly smooth, displaying only 
fine parallel incised strie. 
Measurements. M. 
Depth of dentary bone at middle............... aonaeiaes -030 
Length of mandibular tooth..............0 cece cece eens .009 
Antero-posterior diameter of mandibular tooth at base... .0035 
Length of long maxillary tooth................00e0eees 022 
Antero-posterior diameter do. at base..... Sear ave ate ain alee. 006 
Length of small maxillary tooth..................000- 007 
Antero-posterior diameter do. at base.............02e05 002 
The smaller size and slender form of the smaller maxillary teeth, as well 
as the peculiar sculpture distinguish this species from the L. odsoletus. 
Another specimen of Leptophractus resembles the one above described in 
the form and disposition of the teeth, and has the osseous surface of both 
maxillary and dentary bones marked with shallow grooves and punctate 
impressions which do not inosculate. In this it resembles the maxillary 
bone of the large specimen figured on Plate XX XVII of the second volume 
of Paleontology of the Report of the Geological Survey of the State of 
Ohio. 
