Laelaps 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

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

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.