Hedronchus sternbergii, Cope ED, 1876Ceratodus eruciferus, Cope ED, 1876Ceratodus hieroglyphus, Cope ED, 1876

Cope ED, 1876, Descriptions of some vertebrate remains from the Fort Union beds of Montana, Proceedings of the Academy of Natural Sciences of Philadelphia 28, pp. 248-261 : 259-260

Ceratodus eruciferus , sp. nov.

A basal lamina separable from the dentigerous lamina. The latter supports ribs which diverge from a single marginal rib which extends along one side. Ttie marginal rib is separated by a deep groove from the radiating ribs, which is contintuous with the gr ooves between the latter. The ribs are of irregular diameter and not perfectly straight; they are interrupted by weak transverse ridges which project beyond the margins. The ridges rises abrtuptly from their common base and are separated distally by notches of the margain.

There are six ridges in the length.

Ceratodus hieroglyphus , sp nov.

This species is materially differenit from the last, and was more abundant,judging from the occurrence of its remains.

The dentigerous plate is thin and dense, and has the appearance of a short toothed comb witlh a handle. The tooth-like points are the extremities of low ridges, which are arranged nearly at right angles to a wide longitudinal elevated half of the osseous base. They are separated by shallow grooves from each other, and are not continuous with the basis jutst mentioned,which rises abrtuptly above them. They are smooth. The " handle " above alluded to is triangular in section having two bevels on the side stupportlng the tooth ridges. The lower face of the bone is smooth.

There are thirteen teeth in the length.

Ceratodus eruciferus , sp. nov.

A basal lamina separable from the dentigerous lamina. The latter supports ribs which diverge from a single marginal rib which extends along one side. Ttie marginal rib is separated by a deep groove from the radiating ribs, which is contintuous with the gr ooves between the latter. The ribs are of irregular diameter and not perfectly straight; they are interrupted by weak transverse ridges which project beyond the margins. The ridges rises abrtuptly from their common base and are separated distally by notches of the margain.

There are six ridges in the length.

Ceratodus hieroglyphus , sp nov.

This species is materially differenit from the last, and was more abundant,judging from the occurrence of its remains.

The dentigerous plate is thin and dense, and has the appearance of a short toothed comb witlh a handle. The tooth-like points are the extremities of low ridges, which are arranged nearly at right angles to a wide longitudinal elevated half of the osseous base. They are separated by shallow grooves from each other, and are not continuous with the basis jutst mentioned,which rises abrtuptly above them. They are smooth. The " handle " above alluded to is triangular in section having two bevels on the side stupportlng the tooth ridges. The lower face of the bone is smooth.

There are thirteen teeth in the length.

Ceratodus hieroglyphus , sp nov.

This species is materially differenit from the last, and was more abundant,judging from the occurrence of its remains.

The dentigerous plate is thin and dense, and has the appearance of a short toothed comb witlh a handle. The tooth-like points are the extremities of low ridges, which are arranged nearly at right angles to a wide longitudinal elevated half of the osseous base. They are separated by shallow grooves from each other, and are not continuous with the basis jutst mentioned,which rises abrtuptly above them. They are smooth. The " handle " above alluded to is triangular in section having two bevels on the side stupportlng the tooth ridges. The lower face of the bone is smooth.

There are thirteen teeth in the length.