1 66 PATAGONIAN EXPEDITIONS I PALAEONTOLOGY. 
of the head. There is no such notch between the head and the great 
trochanter as there is in Nesodon , and the trochanter itself, though very- 
heavy, is low, the head projecting considerably above it, while the digital 
fossa is smaller and deeper. The second trochanter is much reduced and 
Fig. 29. 
Toxodon burmeisteri: A, left femur, dorsum; B, the same, external view. Also left patella, 
dorsum. All figures X La Plata Museum. 
forms a mere rugose line, while the third trochanter has disappeared 
altogether. The shaft is long, broad and antero-posteriorly compressed, 
though not as strongly as in the elephants ; the posterior surface is quite 
