470 



FOSSIL TURTLES OF NORTH AMERICA. 



L --" 



P~1G. 629. Plastomenus acupictus. 

 Plastron of type. X I. 



Plastomenus acupictus Hay. 

 Fig. 629. 



Plastomenus acupictus, Hay, Bull. Amir. Mus. Nat. Hist., xxiii, 1907, p. 852, plate liv, figs l-:, 

 text-fig. 8. 



The fragmentary remains of this species are a part of the Cope collection in the American 

 Museum of Natural History. The catalog number is 1025. The bones were collected for 



Professor Cope many years ago, apparently from Torrejon 

 deposits, in New Mexico, by Mr. David Baldwin. The 

 individual was a small one. 



A costal bone, believed to be the third, is 10 mm. wide 

 and 3 mm. thick at the neural border. The seventh costal 

 is 16 mm. wide at the distal end, 3 mm. thick at the sutural 

 edge, and 4.5 mm. thru the ridge formed by the rib. 



On the hinder costals are seen 6 or 7 welts. The pits 

 covering all the upper surface except the beveled free bor- 

 der, are unusually small, there being 5 in a line 5 mm. long. 



The hinder lobe had a width of about 60 mm. at the 

 base. The suture between the hypoplastron and the xiphi- 

 plastron (fig. 629) is 27 mm. long. At the bridge the hypo- 

 plastron is 8 mm. wide and 5 mm. thick. As in other 

 species of the genus, there seem to have been no fontanels 

 on the midline of the plastron. 



There are no welts on the plastral bones and the pits 

 are somewhat smaller than on the carapace. 



Plastomenus catenatus Cope. 

 Plate 86, fig. 1. 



Plastomenus catenatus, Cope, Syst. Cat. Vert. Eocene New Mexico, p. 35 ; Ann. Report Chief Engineers, 



1875, Append. LL, p. 1016 (of reprints, p. 96). 

 Plastomenus multifoveatus, Cope, Wheeler's Report Surv. West 100th Merid., 1877, iv, p. 49, plate xxv, 



fig. II. 



The fragment of costal plate on which Cope based the present species is in the U. S. 

 National Museum and bears the number 1 138. It was discovered in the Wasatch Eocene 

 beds, in the region of the Gallinas River, New Mexico. When Cope came to figure the speci- 

 men, in 1877, he had come to the conclusion that it belonged to a species that he had already 

 described from the Bridger beds of Wyoming, a species which he called P. multifoveatus, but 

 which is here described as P. thomasi. The present writer has examined the type of P. catenatus 

 and has become convinct that it belonged to a species distinct from the Bridger form men- 

 tioned. As the fragment has already been named, figured, and described, it appears to be 

 best to retain for it the original name and await the finding of additional materials from the 

 type locality. Cope's figure of the fragment is reproduced on plate 86, fig. 1. 



The piece of costal is 25 mm. wide, 4 mm. thick. The ridges separating the pits are 

 wider than in the case of P. thomasi, and the slope into the pits is more abrupt. In a line 15 

 mm. long there are 7 of the pits. In some cases two or more of them appear to have coalesct. 



Plastomenus? leptomitus (Cope). 



Plate 86, fig. 1; text-fig. 630. 



Trionyx leptomitus, Cope, Syst. Cat. Vert. Eocene New Mexico, 1875, p. 35; Append. LL, Ann. Report 

 Chief Engineers, 1875, p. 1015 (separata, p. 95); Wheeler's Surv. W. 100th Merid., iv, 1877, p. 44, 

 plate xxv, figs. 27 31, plate xxvi, figs. 1-4.; Vert. Tert. Form. West, 1884, p. 118. King, U. S. 

 Geol. Explor. 40th Parallel, Syst. Geol., I, 1878, p. 377. Hay, Bibliog. and Cat. Foss. Vert. N. 

 A., 1902, p. 454. 



The known remains of this species were collected by Professor Cope in the year 1874, in 

 deposits belonging to the Wasatch formation, in Rio Arriba County, New Mexico. These 

 specimens are now in the U. S. National Museum, at Washington, and bear the numbers 



