EDENTATA OF THE SANTA CRUZ BEDS. 67 



First lumbar, width over metapoph- Third lumbar width of posterior face. .022 



yses 060 " " height of neural spine . . .046 



Second lumbar, length of centrum . . . .016 " " width over metapophy- 



" " width of posterior face .022 ses 063 



" " height of neural spine .049 Ilium, length 088 



Second lumbar, width over metapoph- " width of anterior plate 043 



yses 064 Sacro-sciatic foramen, length 046 



Third lumbar, length of centrum 014 Pelvis, width at acetabula 103 



PROEUTATUS CARINATUS Ameghino. 



(Plate VII, Fig. 4.) 



Eutatus carinatus Amegh.; Revista Argentina de Hist. Nat, T. I, p. 254, 



1891. 



Proeutatus carinatus Amegh.; Enum. Synopt. de Mamm. Foss. de Pata- 

 gonie, 1894, p. 175. 



Of this very imperfectly known species, the only specimen that I have 

 seen is the type in the Ameghino collection, which is a fragment of the cara- 

 pace only. There can be no doubt, however, that this represents a distinct 

 species, and Very little that it is properly referred to the present genus. 



The scutes indicate an animal of much the same size as P. lagena, but 

 the sculpture is entirely different. In the movable plates the flask-shaped 

 figure occurs, but the ridge which passes backward from the neck of the 

 flask is very much more prominent. Still more characteristic is the pat- 

 tern of the fixed plates of the pelvic shield ; they have no flask-like figure, 

 but two. large and deep anterior pits, closely approximated and placed 

 near the median line, and behind these is the prominent central ridge, 

 shaped like a long and narrow spear-head, with point directed backward. 

 Anteriorly, there is a broad, triangular figure, with its base occupying the 

 whole front border of the plate, and two much smaller, square figures, one 

 on each side of the pair of pits. 



PROEUTATUS DELEO Ameghino. 



(Plate XII, Figs. 10-12.) 



Eutatus deleo Amegh.; Revista Argentina de Hist. Nat, T. I, p. 254, 1891. 

 Proeutatus deleo Amegh.; Enum. synopt. des Mamm. Foss. de Patagonie, 



1894, p. 174. 



This is another imperfectly known species, of which I have seen no 

 specimens but those in the Ameghino collection, consisting of part of the 



