8o 



PATAGONIAN EXPEDITIONS: PALEONTOLOGY. 



Face, length from anterior rim of 





Radius, proximal width 



.oi6 



orbit .... 



.078 



" distal width 



.0185 



Cranium, width at postorbital con 





Femur, proximal width 



.042 



striction .... 



•033 



Tibia, length on inner side 



•133 



Rostrum, width 



.025 



" distal width 



.019 



Palate, length in median line . 



.091 



Fibula, distal width 



.004 



" width at pi- . 



.022 



" thickness 



.009 



" " m^ 



.027 



Astragalus, length 



• . .032 



Humerus, length from head . 



.128 



" width of trochlea 



.018 



" proximal thickness 



.041 



" " " distal enc 



I . .016 



" distal width over trochlea 



L .018 



Metacarpal II, proximal width . .008 



" distal width over epicon 





III, length . 



.068 



dyles 



.0295 



" proximal width . .016 



Radius, length 



•113 







Locality. — Lake Pueyrredon. 



This species is dedicated to Cleveland H. Dodge, Esq., of New York, 

 whose oft-exercised liberality has been one of the main supports of the 

 Patagonian work. 



Proterotherium acre (Ameghino). 



(Plate VIII, Fig. 7.) 



Heptaconus acer Am&g.; Enum. Synopt, etc., 1894, p. 44. 



As was pointed out on a preceding page (p. 54) it frequently happens 

 in various species of Proterothermm that a small enamel pillar makes its 

 appearance, as a development of the cingulum, between the internal cusps 

 of the upper molars. In most cases, however, this pillar is minute and 

 very variable, differing much even in the opposite sides of the same jaw. 

 One individual, shown in Plate X, fig. i, and perhaps belonging to an 

 undescribed species, has this pillar small, though very distinct on p-, m- 

 and -, at least, as these are the only teeth with completely preserved 

 crowns, and it may very well have been present in p- and m- also. In 

 Proterothermm acre the pillar attains a large size, becoming nearly as 

 large and prominent as the hypocone. So far, this species is known only 

 from a single tooth, an upper molar of the left side, which measures 14 

 mm. in antero-posterior, by 19 mm. in transverse diameter. 



Locality. — Not given. 



TETRAMERORHINUS Ameghino. 



(Plate VII, Figs. 8-1 1.) 



Tretramerorhimts Amegh.; Enum. Synopt, etc., 1894, p. 39. 



