Fourth note on the Dinosauria of the Laramie.
E. D. Cope.
The American Naturalist
1892
1892-09-30
26
756
758
Cope, 1872
Cope
[183,514,471,505]
Reptilia
Ceratopsidae
Agathaumas
GBIF
Animalia
Dinosauria
2
758
Chordata
genus
Professor Marsh (Amer. Journ. Sci. Arts, 1892, p. 83) endeavors to show that this genus differs from any of those described by him by quoting characters from mydescription of the type specimen. Since mylast description of that genus was published (1875), I have studied part of a skeleton obtained by Dr. J. L. Wortman in Dakota, of which the parts are undistinguishable from those of the Agathaumas silvestre.These include an ilium in much better preservation than that of the type, and I am enabled to correct some of the statements contained in myoriginal description. I stated that there is no facet for the pubis at the front of the acetabulum. The surface at this point is broken in both of my specimens, but it is altogether probable that the structure at this point does not differ from that of the allied forms. The ischiadic suture is in like manner obscured by injuries in the type specimen. The Dakota specimen is perfectly preserved at this point, and displays a largeconvex sutural surface for the ischium, thus showing that my original description was imperfect in this point. The number of sacral vertebrae in the original specimenis not exactly determinable—only approximately, but this region is identical in character with that of other members of the family. That the Agathaumas silvestreis one of the largestspecies of the family is indicated by the following measurements of the Dakota specimen: mm. Length of ilium 1465 Length of tibia 940 Diameters of tibia {greatest proximal 325 {greatest distal 290 Diameters of dorsal centrum {anteroposterior vertical 138 {transverse 137 The centrum of the dorsal vertebra is slightly opisthocoelous.
2433423074
[145,368,606,640]
United States
Laramie Formation
Cretaceous
2
758
illium
1