The maxilla is a long, narrow element on the border of the skull. The suture separating this from the lacrimal and jugal is quite clear. The teeth which the maxilla undoubtedly bore are hidden by the remains of the mandible, which lies partly on the edge of the skull. The jugal is a very large element and its boundaries seem well assured. Its size and relations recall the condition in Capitosaurus. It forms a part of the external boundary of the orbit. The lateral suture of the postorbital is evident and is, as shown in the figure, somewhat curved. The remaining elements preserved on the fragmentary skull can not be accurately determined, though their probable position is indicated in plate 30, fig. 2, the lettering being based on the arrangement of these elements in Capitosaurus.
The lower jaw is poorly preserved, but what remains shows evidence of being sculptured somewhat after the manner of the cranial elements. It bore strong recurved teeth which are longitudinally striate.
| Measurements of the Type Specimen of Macrerpeton huxleyi Cope. | |
| mm. | |
| Length of portion preserved | 120 |
| Maximum width of specimen | 58 |
| Length of orbit | 20 |
| Width of orbit | 14 |
| Length of jaw, as preserved | 75 |
| Width of jaw at widest part | 11 |
| Length of longest tooth | 8 |
| Width of tooth at base | 4 |
Description of Additional Material of Macrerpeton huxleyi.
The additional material of this species which has come to hand consists of an almost complete skull (American Museum No. 2933, two portions); another fragmentary skull (American Museum No. 8572 G and 8532 G); a portion of an interclavicle (American Museum No. 8006); two incomplete vertebræ (American Museum No. 8007); and another fragmentary element possibly representing a scapula of this species (American Museum No. 8008).
The skull has essentially the shape outlined ([462]) from a study of the fragmentary type specimen. The muzzle was drawn slightly too broad, but otherwise the restoration is fairly accurate. The specimen is distorted and imperfect, but enough is preserved to give a good idea of the shape and something of the structure of the skull. A portion of the obverse is preserved. The back part of the skull is broken, so that the occiput can not be studied.
The length of the skull is one and two-fifths the greatest breadth (across the orbits). The cranial elements are deeply marked with pits and short, shallow grooves. On the left mandible these pits are in a very distinct row, the operculo-mandibular lateral-line.
Macrerpeton deani new species.
Type: Specimen No. 2934, American Museum of Natural History.