D. S. GEOLOGICAL SURVEY 



MONOGUAPH 55 PLATE XVI 



r 





^ 



■^ 



B 



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THE REGION OF THE HORN SWELLING IN PALAEOSYOPS, MANTEOCERAS, AND TELMATHERIUM 



A', Palaeos^iops robuiiui (Am. Mus. 1554), superior view; A', the same, vertical longitudinal secftion. B, Manteoceroj manteoceras (Am. Mus. 1569). 

 C, Telmatherium ultimum (Am. Mus. 2004). fr, Frontals; h, rudimentary horn; mx, maxillary; na, nasal. All natural sise 



