PATAGONIAN EXPEDITIONS I PALAEONTOLOGY. 



usually long neural spines and metapophyses and the broad, plate-like 

 ribs. The tail is apparently short and evidently thick. The limbs are 

 short and very heavy, and are remarkable for the great development of 

 the processes for muscular attachment, and the pelvis is exceedingly 

 large. 



In the following table the measurements except those of the pelvis are 



from No. 15,389. 



MEASUREMENTS. 



Pelvis, length 1 80 



" width at acetabulum 095 



Ilium, length 099 



" width of anterior plate 046 



" " of peduncle 019 



Ischium, length 08 1 



width of posterior expansion .. .105 



thickness of expansion 02 1 



Acetabulum, antero-posterior diameter . .022 



Pubis, length 065 



Sacro-sciatic foramen, length 060 



Obturator foramen, length 050 



Femur, length from head 109 



" " " great trochanter. .. .126 

 " width of proximal end 034 



Femur, width of distal end 040 



Tibia, length 087 



" width of proximal end 035 



" and fibula, width of distal end . . . .030 



Fibula, thickness of proximal end 017 



" " of distal end 013 



Astragalus, length 023 



" width of trochlea 020 



" " of head 012 



Calcaneum, length 042 



" width of proximal end 019 



' ' dorso-plantar diameter prox- 

 imal end oio 



" width of distal end 016 



PROEUTATUS CENOPHORUS Ameghino. 



(Plates XII, Figs. 1-6, XIV, 5, 6.) 



Eittatus cenophorum Amegh ; Enumeracion sistematica, etc., 1887, p. 25. 



Eutatus bipunctatus Amegh ; Ibid. 



Proeutatus cenophorum Amegh ; Revista Argentina de Historia Natural, 



1891, p. 327. 

 Tkoracotherium priscum Mercerat ; Revista del Museo de La Plata, II, 



1891, p. 43. 



Thoracotherium cenophorum Mercerat ; Ibid., p. 44. 

 Eiitatus cenophorum ; Lydekker ; Anales del Museo de La Plata, T. Ill, 



1894, p. 64. 



The movable scutes have markings very similar to those of P. robus- 

 tus ; narrow and shallow, but very distinct grooves form a figure which 

 Ameghino has aptly compared to a flask, with the neck directed forward 

 and the body occupying nearly the whole breadth of the posterior half of 



