1873.] 



On a newly discovered extinct Mammal. 



383 



Right radial com- Axilla Kate of Rate of re- 







pressed by 



temp. 



pulse. 



spi ration. 









o 







(VIII.) Before 



run 



. . 232 



37, 



98-8* 75 



16 



After 





..116 



37-6, 99-8* 110 





(IX.) Before 



run 



.. 308 



OD 



fin 



16 



After 





.. 500 



36-8 



102 





(X.) Before 



run 



.. 540 



OO O 







After 





.. 164 



Q'T.O 



1 QO 





(XI.) Before 



run 



.. 290 



OO D 



o / 



20 



After 



?> 



190 



37 



120 





(XII.) Before 



run 



.. 220 



36-6 



87 





After 



55 



.. 250 



37-6 



124 







Left radial corn- 













pressed by 









(XIII.) Before 



run 



.. 165 



36-7 



60 





After 



55 



.. 275 



37-2 



108 





In all the tracings a indicates that taken before the run ; b, c, d those 

 after. 



IV. " On a newly discovered extinct Mammal from Patagonia [Ho- 

 malodotherium Cunninghami) By William Henry Flower, 

 F.R.S., Hunterian Professor of Comparative Anatomy, and 

 Conservator of the Museum of the Royal College of Surgeons. 

 Received May 30, 1873. 



(Abstract.) 



The author describes the complete adult dentition of a new genus of 

 mammal, founded on remains discovered by Dr. Robert O. Cunningham 

 in deposits of uncertain age on the banks of the River Grallegos, South 

 Patagonia. The animal appears to have possessed the complete typical 

 number of teeth, i. e. twenty-two above and below, arranged in an un- 

 broken series, and of nearly even height, and presenting a remarkable 

 gradual transition in characters, in both jaws, from the first incisor to the 

 last molar. The molars more nearly resemble those of the genus Rhino- 

 ceros than any other known mammal ; and, judging only by the general 

 characters of the teeth, the animal would appear to have been a very 

 generalized type of Perissodactyle Ungulate, allied through Hyracodon 

 (a North- American Miocene form) to Rhinoceros, also more remotely to 

 Macrauchenia, and, though still more remotely, to the aberrant Nesodon 

 and Toxodon. The generic name Homcdodotherium was suggested for this 

 form by Professor Huxley in his Presidential Address to the Geological 

 Society in 1870. 



* Taken by another instrument in mouth. 



