EDENTATA OF THE SANTA CRUZ BEDS. 



55 



MEASUREMENTS. 



Proximal phalanx, digit III, width of 



proximal end OIO 



Proximal phalanx, digit IV, length 0065 



Proximal phalanx, digit IV, width of 



proximal end 012 



Proximal phalanx, digit V, length 004 



Proximal phalanx, digit V, width of 



proximal end 95 



Second phalanx, digit II, length 012 



Second phalanx, digit II, width of prox- 

 imal end 009 



Second phalanx, digit III, length 009 



Second phalanx, digit III, width of 



proximal end oil 



Second phalanx, digit IV, length ... .009 

 Second phalanx, digit IV, width of 



proximal end oio 



Second phalanx, digit V, length 008 



Second phalanx, digit V, width of prox- 

 imal end 009 



Ungual phalanx, digit I, length 016 



Ungual phalanx, digit I, width of prox- 

 imal end 0065 



Ungual phalanx, digit II, length 025 



Ungual phalanx, digit II, width of prox- 

 imal end 0095 



Ungual phalanx, digit III, length 032 



Ungual phalanx, digit III, width of 



proximal end oi I 



Ungual phalanx, digit IV, length 030 



Ungual phalanx, digit IV, width of 



proximal end 0095 



Ungual phalanx, digit V, length 021 



Ungual phalanx, digit V, width of prox- 

 imal end 008 



Digit I, length 048 



" II, " 080 



" III, " 074 



" IV, " 058 



" V, " 040 



As the pelvis is missing from the type-specimen, the following descrip- 

 tion is taken from another individual (Plate XV, figs, i, 2), which is re- 

 ferred to this species on account of its large size. This pelvis is strikingly 

 different from that of any other Santa Cruz genus, especially in the de- 

 velopment of the ischia. The ilium has a rather short, broad and de- 

 pressed peduncle, which expands anteriorly into a broad, vertical plate, 

 with elongate, thickened, rugose crista, which is less everted than in 

 Stegotheriiun and is not so club-like, but rising much higher above the 

 sacrum to the level of the lumbar metapophyses, and was evidently 

 adapted to the support of the heavy carapace ; the gluteal surface is smaller 

 than in the last-named genus and the sacro-sciatic foramen larger, and the 

 ilio-pectineal processes are much less prominent. The acetabulum is rela- 

 tively small and of nearly circular shape, with prominent borders ; the 

 sulcus for the round ligament is deep, but not very large. The ischium 

 has a considerably shorter peduncle than the ilium, which is laterally 

 compressed and broad ; it rapidly expands into a great vertical plate, the 

 free border of which describes an arc of about 120 and rises far above 

 the sacrum ; most of this border is extremely thick and rugose and ob- 

 viously supported the massive pelvic buckler. For most of its length the 



