Aublysodon lateralis, Cope, 1876Laelaps incrassatus, 1876Laelaps explanatus, 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 : 248-249

Aublysodon lateralis , sp. nov.

Established on some teeth, one of whiclh is of the size of those of the A. horridus , a-nd which differ in some important particulars. The posterior crenate ridge is as in that species, lateral in position, separating a posterior face from the lateral at a right angle. The posterior face is separated from that of the other side by a very obtuse angle. The anterior aspect of the crown is witlhout crenate cuttinlg edge, but the latter is present as a border to the front, passinig alonig the front of the sidle opposite to that wlhich bears the posterior angle. It is directed laterally, anld projects beyond an openi groove wlich follows its posterior base. The base of the crown is broad elliptic in section. Enamel smooth.

A muchl smaller tooth was found withl the preceding, and presented similar clharacters, exceptinog that the posterior face is not so strongly truncate.

Measurements.	M.
Length of crown preserved.	.025
Diameter of base of crown long short	.018.010
Width of posteriorface	.006
Length of smaller crown	.011
Long diameterof base of do..	.006

Laelaps incrassatus , sp. nov.

Represented by two teeth, a larger anfl a smaller, whicli were foundi near each other, but not sufficiently so as to warrant the belief that they pertain to the same individual.

Measurements.	M.
	No. 1.	No. 2.
Lengtll of crown	.025	.014
Diameter at base {antero-pnsterior.012.006 transverse.0135 .008	.012.006 transverse.0135 .008	.006 transverse.0135 .008

A large species. Discoveredi by Jno. C. Isaac.

Laelaps explanatus , sp. nov.

An abundant species, but as yet represented onily by teeth which are about the size of those of the largest of living Varanidae .

The crowns are strongly compressed and curved; one side is flat, the other gently convex; the posterior cutting edge is median and concave. The anterior edge is not continued to the base of the crown, and disappears before attaining the apex; it is feebly denticulate, and only at its conivex curvature towards the apex; its course is mediani. The flat face has a slight bevel to the posterior edge. Surface smooth, without transverse unidulations.

Laelaps incrassatus , sp. nov.

Represented by two teeth, a larger anfl a smaller, whicli were foundi near each other, but not sufficiently so as to warrant the belief that they pertain to the same individual.

Measurements.	M.
	No. 1.	No. 2.
Lengtll of crown	.025	.014
Diameter at base {antero-pnsterior.012.006 transverse.0135 .008	.012.006 transverse.0135 .008	.006 transverse.0135 .008

A large species. Discoveredi by Jno. C. Isaac.

Laelaps explanatus , sp. nov.

An abundant species, but as yet represented onily by teeth which are about the size of those of the largest of living Varanidae .

The crowns are strongly compressed and curved; one side is flat, the other gently convex; the posterior cutting edge is median and concave. The anterior edge is not continued to the base of the crown, and disappears before attaining the apex; it is feebly denticulate, and only at its conivex curvature towards the apex; its course is mediani. The flat face has a slight bevel to the posterior edge. Surface smooth, without transverse unidulations.

Laelaps explanatus , sp. nov.

An abundant species, but as yet represented onily by teeth which are about the size of those of the largest of living Varanidae .

The crowns are strongly compressed and curved; one side is flat, the other gently convex; the posterior cutting edge is median and concave. The anterior edge is not continued to the base of the crown, and disappears before attaining the apex; it is feebly denticulate, and only at its conivex curvature towards the apex; its course is mediani. The flat face has a slight bevel to the posterior edge. Surface smooth, without transverse unidulations.