226 



TITANOTHERES OF ANCIENT WYOMING, DAKOTA, AND NEBRASKA 



Type locality and geologic horizon. — Swift Current 

 River, Assiniboia, Canada; Cypress Hills beds, level 

 not recorded. 



Type. — Coossified nasal bones detached from skull. 

 Ottawa Mus. (See fig. 185.) 



Figure 186. — Type of Menodus syceras 

 Coossified nasal and left horn eoie. After Cope. Ai, Leftside; A2, front; A3, section of left horn. One-half 



Characters of type. — Cope writes: 



Represented by a nasal process, which consists of the coossi- 

 fied nasal bones, of peculiar form. They are elongate as com- 

 pared with their width and are vaulted. The lateral borders 



are nearly parallel, and the extremity viewed from above is 

 rounded. Owing to the thickness of the body, the profile 

 descends abruptly at the extremity, and the convex surface is 

 roughened as though for the attachment of some fixed body, 

 tegumentary or muscular. From this tuberosity the surface 

 descends steeply to a thin border. A short distance posterior 

 to the extremity the lateral margins are 

 decurved, forming the lateral walls of a 

 deep longitudinal median gutter-like nasal 

 meatus, which is deeper than in any other 

 species. The horns are broken off, but the 

 median inferior surface is so little recurved 

 laterally that it is evident that the former 

 were not only small but laterally placed. 

 Length of fragment above, millimeters, 130; 

 length of nasal border, 70; width at nasal 

 notch, 80; width near extremity, 65; depth 

 at apical tuberosity, 26. 



Additional ohservations. — The 

 lower surface of the horns in the 

 type exhibits a portion of the frontal 

 sinus. The nasals are shorter than 

 in the type of M. coloradensis. The 

 measurements are as follows: 



Millimeteis 



Free length of nasals 80 



Free width of nasals 101 



Outside measurement of horns 67 



Anteroposterior measurement of horns 79 



Etymology. — "This species is dedi- 

 cated to Dr. A. R. C. Selwyn, the 

 accomplished Director of the Survey 

 of Canada." (Cope.) 



Present determination. — The species 

 is probably allied to Diploclonus 

 hicornutus (Osborn). 



Menodus syceras Cope, 1889 



Cf. Megacerops syceras, this monograph, 

 page 549 



Original reference. — Am. Natu- 

 ralist, vol. 23, pp. 628-629, July, 

 1889 (Cope, 1889.2). 



Subsequent reference. — Cope, On 

 Vertebrata from the Tertiary and 

 Cretaceous rocks of the Northwest 

 Territory, I, p. 18, pis. 7, fig. 2; 8, 

 figs. 4, 5, 1891 (Cope, 1891.2). 



Type locality and geologic hori- 

 zon. — Swift Current River, Assiniboia, 

 Canada; Cypress Hills beds, level 

 not recorded. 

 The nasal bones of three individuals 

 present the characters above given." Of these we may 

 select as the lectotype the specimen figured by Cope 

 (1891.2, pi. 8) that shows the character from which 



