^0.2.] COPE ON EXTINCT RHINOCERID.E. 229 



The only genus of TapirulUlw is the Eocene Tcqnrulm Gervais. 

 The genera of the Ehinoceridw differ as follows : 



I. Four anterior digits. 



Incisors t; canine?; no horn; posttympanicljoue distinct Aceratltenum. 



II. Three anterior digits. 



Incisors —p- ; canines"; no horn; posttynipanic hone distinct Aplielops, 



Incisors t; canines"; a dermal horn ; posttympanic distinct Ccratorhinus. 



Incisors f ; canines j ; a dermal horn ; posttympanic ? Zalabis. 



Incisors -\ ; canine -" ; a dermal horn ; posttympanic process coossified Avith post- 



glenoid process ; no nareal septiim Bhinocerus. 



Incisors {5 ; canines 8 ; a dermal horn ; posttympanic process not nnited with post- 



glenoid ; no nareal osseons septiuu Atelodus. 



Incisors g ; canines ^ ; a dermal hoj:n ; posttympanic coosified with postglenoid ; 



an osseous septum narium Coelodonta. 



The species of these genera are the following ; the names of the exist- 

 ing species are in Eoman letters, the extinct ones in italics : 



ACEEATHEEIU3I Kaiip. 



A. incisivuni Ciiv. Middle Miocene. Europe. 



A. gannatense Duv. Middle Miocene. Europe. 



A. lemanense. Middle Miocene. Europe. 



A. mite Cope. Lower Miocene, iforth America. 



A. occidentale Leidy. Lower Miocene. ]^^orth America. 



A. pacifieum Leidy. Middle Miocene. I^orth America. 



A. truquianum Cope. Middle Miocene. N.orth America. 

 Aphelops Cope. 



A. meridianus Leidy. Upper Miocene. Xorth America. 



A. megaJodus Cope. Upper Miocene. North America. 



A. fossiger Co-pe. Upper Miocene. North America. 



A. malacorlimus Cope. Upper Miocene. North America. 

 OERATOEHmus Gray. 



C. sumatranus Cuv. Eecent. Sumatra. 



C. lasiotis Sclater. Eecent. Malacca. 



C. scMeiermacJieri Kaup. Middle Miocene. Europe. 



0. aurelianensis Gaudry. Upper Miocene. Europe. 

 Zat.abis Cope, gen. nov. 



Z, sivalensis C. F. Upper Miocene. India. 

 Ehinocerus Linn. 



E. unicornis L. Eecent. India. 



E. sondaicus Cuv. Eecent. Java. 



E. paJceindiciis C. F. Upper Miocene. India. 



E. platyrliinns C. F. Upper Miocene. India. 

 Atelodus Pomel. 



A. bicornis Linn. Eecent. Africa. 



A. simus Lurch. Eecent. Africa. 



A.pacltygnatliiisVi^Rgn. LTpper Miocene. Europe. 



A. leptorhinus Cuv. Pliocene. Europe. 



