EDENTATA OF THE SANTA CRUZ BEDS. 49 



massive carapace. The neural spines are considerably longer and heavier 

 than in Stegotlicnnm ; posteriorly they increase in height, but diminish in 

 breadth and thickness ; they also become less steeply inclined. 



In none of the specimens can the number of sacral vertebrae be exactly 

 determined, but it appears to be nine ; the first two vertebras articulate with 

 the ilia, then follow four having no connection with the pelvis, succeeded 

 by three which are fused with the ischia. As a whole, the sacrum has a 

 moderate fore-and-aft curvature. The first sacral has a broad, heavy and 

 depressed centrum, with large pleurapophyses which are indistinguishably 

 fused with the ilia. In the succeeding vertebrae the centra are much con- 

 tracted and have a strong ventral keel, while that of the last sacral is 

 broader and less depressed than that of any other except the first. The 

 neural spines have coalesced into a ridge, which is very much higher and 

 thicker than in Stegotheriuni, with sinuous dorsal border thickened at in- 

 tervals. Prezygapophyses are present on the first vertebra, with well de- 

 veloped metapophyses rising from them, and postzygapophyses on the last. 



No caudal vertebrae have been found in association with this species. 



MEASUREMENTS. 



Neck, length on ventral side 058 Second thoracic, width of anterior face. .027 



Atlas, length on outer side 018 " " height of neural spine. .058 



" width 048 Eleventh thoracic, width of posterior. . 



Compound cervical, length 026 face 022 



Compound cervical, breadth of neural Eleventh thoracic, width over meta- 



spine 023 pophyses 066 



Axis, width of anterior face 032 Eleventh thoracic, height of neural spine .044 



Fifth cervical, length of centrum 006 First lumbar, length of centrum 015 



" width of anterior face 025 " " width of posterior face .. .022 



Sixth cervical, length of centrum 005 " '" height of neural spine .. .048 



" width of anterior face 0255 First lumbar, width over metapophy- 



Seventh cervical, length of centrum 007 ses 070 



" width of anterior face. .026 Second lumbar, length of centrum 017 



Trunk, length in straight line 184 " " width of posterior face. . .023 



" along dorsal curve 207 " " height of neural spine. . .050 



First thoracic, length of centrum oio " " width over metapophyses .074 



width of anterior face . . . .025 Third lumbar, length of centrum 0145 



height of neural spine ... .065 " " width of posterior face .. .025 



Second thoracic, length 012 " " height of neural spine. . .070 



Ribs and Sternum (Plate X).--In general, the limbs resemble those of 

 Dasypus, but are relatively larger and heavier. The first rib is the usual 



