178 



TITANOTHERES OF ANCIENT WYOMING, DAKOTA, AND NEBRASKA 



In this faunal list the present specific name is 

 merely mentioned. No type is specified, and no 

 characters are given, so that Palaeosyops manteoceras 

 Matthew was a nomen nudum until the type was 

 designated by Hay in 1902. (See p. 365.) 



Etymology. — /xavris, prophet; Ktpas, horn; in allusion 

 to the incipient "horns" above the orbits. 



Telmatotherium diploconum var. minus Matthew, 1899 



(Nomen nudum) 



Original reference. — Am. Mus. Nat. Hist. Bull., 

 vol. 12, p. 50, 1899 (Matthew, 1899.1). 



In Matthew's faunal list " Telmatotherium diploconum 

 var. minus" is recorded but not defined, and no type 

 is specified. Hence Telmatotherium diploconum minus 

 is a nomen nudum. 



Etymology. — minus, less; because smaller than the 

 tyjDical T. diploconum. 



Canis? marshii Hay, 1899 



Of. Palaeosyops major? Leidy, this monograph, page 321 



Original reference. — Science, new ser., vol. 10, p. 253, 

 1899 (Hay, 1899.1). Founded on "Canis montanus" 

 Marsh (see p. 158), which was preoccupied by Canis 

 montanus Pearson. 



Etymology. ^-'Named in honor of Prof. O. C. Marsh. 



Present determination. — As explained above, the 

 type of Canis montanus Marsh (not Pearson) and 

 Canis? marshii Hay is a second lower premolar of an 

 Eocene titanothere, probably Palaeosyops paludosus 

 or P. major. Canis? marshii Hay is therefore either 

 indeterminate or a synonym of P. paludosus or P. 

 major. 



Manteoceras manteoceras Hay, 1902 (ex Osborn MS.) 



Cf . Manteoceras manteoceras Hay, this monograph, pages 365-370 



Original reference. — U. S. Geol. Survey Bull. 179, 

 p. 632, 1902 (Hay, 1902.1). 



Lectotype. — A skull (Am. Mus. 1569) lacking the 

 dentition, described and figured by Osborn as "Telma- 

 totherium vallidens" (Osborn, 1895.98, pp. 87-90, figs. 

 7-8). (See fig. 113.) 



Paratype. — An incomplete skull (Am. Mus. 1570) 

 with dentition (op. cit., fig. 9) from the same locality 

 and level. 



Type locality and geologic horizon. — Washakie Basin, 

 Wyo.; discovered by J. L. Wortman, of the American 

 Museum Bridger expedition of 1893, "in a brown 

 layer of sandstone 3 miles north of the base of Haj''- 

 stack Mountain, upon Bitter Creek" (op. cit., p. 87). 



Uintatherium- Manteoceras- Mesatirhinus zone (Wash- 

 akie A). 



. Hay's type. — We have seen above that the name 

 Palaeosyops manteoceras Matthew (ex Osborn MS.) 

 was a nomen nudum, because no type had been desig- 

 nated. The type was for the first time clearly indi- 

 cated by Hay (1902.1, p. 632), who refers to this 



species Hatcher's (1895.1) Plate 39, Figure 2 (p. 368, 

 this monograph) and Osborn's (1895.98) Figures 7-9 

 (pp. 366, 368). These are clearly the same two "prophet 

 horn" skulls (Wortman's first "Manteoceras" speci- 

 mens) that had been at first erroneously referred by 

 Osborn to "Telmatotherium vallidens Cope." Of these 

 two skulls. Am. Mus. 1569 — that is, Osborn's Figures 

 7, 8 and Hatcher's Figure 2 (copied from Osborn's 

 fig. 7) — may be taken as the lectotype. 



The generic name Manteoceras and the specific 

 name manteoceras were first brought together by Hay 

 in the reference now under consideration. 



Specific characters. — In Osborn's original descrip- 

 tion (Osborn, 1895.98, p. 87) these skulls were errone- 

 ously identified as conspecific with the type of Palaeo- 

 syops vallidens Cope, under the name "Telmatotherium 

 vallidens Cope." The specific characters given by 

 Osborn were as follows: 



Superior premolar-molar series, 184-220 millimeters. A 

 narrow diastema. Molar cusps less elevated. A rudimentary 

 nasofrontal tuberosity. Premaxillary symphysis short. Top 

 of cranium flattened; very short bifid sagittal crest. 



Etymology. — fiavrLs, prophet; Kepas, horn; in allu- 

 sion to the incipient "horns" above the orbits. 



Present determination. — The species is a valid one 

 and is fully described on pages 365-370. 



Lambdotherlum primaevum Loomis, 1907 



Cf . Lambdotherium -primaevum Loomis, this monograph, page 283 



Original reference. — Am. Jour. Sci., 4th ser., vol. 23, 

 p. 363, fig. 2, May, 1907 (Loomis, 1907.1). 



Type locality and geologic horizon. — Buffalo Basin, 

 near Meeteetse, Wyo. "Wasatch beds of the Big 

 Basin." Horizon regarded by Loomis as equivalent 

 to the base of the Wind Eiver formation — that is, 

 the Heptodon-Coryphodon-Eohippus zone (Wind River 

 A). 



Holotype. — Amherst Mus. 254, "consisting of upper 

 molars 1 and 2 of the right side and lower molars 1, 2, 

 and 3 from the same side, the specimen being from the 

 Buffalo Basin, near Meeteetse, Wyo. This species is 

 fau'ly abundant at this horizon and is intermediate in 

 size between L. hrownianum and L. popoagicum." 

 (See fig. 114.) 



Characters. — Loomis writes: 



On the upper molars the parastyle, though strong, is not so 

 well developed as in the foregoing forms; the paraoonule is well 

 developed, but the metaconule is so annexed to the metaoone as 

 to appear like a buttress of this cusp. The second molar 

 measures 12 milUmeters transversely [anteroposteriorly] by 17 

 millimeters lengthwise [transversely]. The robust lower molars 

 have the protoconid markedly bifid, while the paraconid and 

 hypoconid are each high crescents. The heel of the last molar 

 is a high shallow basin completely surrounded by an outer rim. 

 The three molars occupy 41 milhmeters. 



The brackets above indicate that in the foregoing 

 description the measurements of the molar teeth 

 have been inadvertently transposed. The description 



