| Measurements of the Type of Leptophractus dentatus Moodie. | |
| mm. | |
| Length of mandible, as preserved | 80 |
| Anterior width of mandible | 3 |
| Posterior width | 28 |
| Length of most anterior tooth | 4 |
| Length of tenth posterior tooth | 7 |
| Width of this tooth at base | 3 |
Leptophractus lineolatus Cope.
Cope, Proc. Am. Phil. Soc., XVI, p. 576, 1877.
Type: Specimen No. 1088 G, American Museum of Natural History.
Horizon and locality: Linton, Ohio, Coal Measures. ([Plate 22, fig. 1.])
Cope's description of this species, to which I have nothing to add, is as follows:
"This species is based on portions of the skull of two individuals of large size. Both upper and lower jaw with teeth are represented and the teeth are of very large size. The deepest element preserved has been provisionally referred to the mandible and will be so described. This element bears two types of teeth in very heterodont fashion. The teeth in the back portion of the jaw are rather short and slender. The teeth more anteriorly are, some of them, very long, rather stout, with their bases longitudinally fluted, as are they all v The longest tooth in the jaw measures slightly less than an inch. The bone is not well preserved, but seems to have been ornamented with grooves of no great depth. The most anterior teeth of the jaw are smaller than the posterior ones.
"The upper jaw is set with teeth which are more uniform in size and there is but little tendency to heterodonty. These teeth are also striated at their base and all end in a sharp point. They are all, apparently, straight. There is no tendency to curve as there is in the genus Macrerpeton. The upper teeth are more closely set than are those of the lower jaw, which are rather distantly placed.
"Another specimen of a smaller individual presents the same portions of the skeleton and the same characters. It is possible that this skull will be found to belong to Ichthycanthus ohiensis Cope, which is based on very large vertebræ and limb bones. The remains described as Leptophractus lineolatus are, however, unlike any other skull re mains which are thus far known.
"This species represents one of the largest types of the Carboniferous Amphibia of Ohio. It probably attained a length of several feet. It was also the most carnivorous of any of the forms."