PATAGONIAN EXPEDITIONS! PAL/EONTOLOGY. 



EXPLANATION OF PLATE LIII. 



PAGE. 



Fig. i. AMPHIPROVIVERRA MANZANIANA : Atlas from above (No. 15,154) . 398 

 Fig. i a. " " Atlas from below, showing the in- 



tercentrum (No. 15,154). 



Fig. 2. BORYH/ENA TUBERATA : Atlas from above, showing the notches for 



the passage of the vertebral artery and 

 spinal nerves (No. 15,701). 350 



Fig. 2a. " " Atlas from below, showing the rugose sur- 



faces for articulation with the intercen- 

 trum (No. 15,701). 



Fig. 3. CLADOSICTIS PETERSONI, type : Atlas from above (No. 15,702) . 380 

 Fig. 3. " " " Atlas from below, showing the fusion 



of the intercentrum with the neu- 

 ral arch (No. 15,702). 



Fig. 4. BORHY^NA EXCAVATA : Atlas from above (No. 15,120). . . 350 

 Fig. 4. Atlas from below (No. 15,120). 



Fig. ^b. " Atlanteal intercentrum from below (No. 



15,120). 



Fig. 5. PROTHYLACYNUS PATAGONICUS : Atlas from above (No. 15,700) . 365 

 Fig. 50. " Atlas from below (No. 15,700) 



showing the fusion of the inter- 

 centrum with the neural arch. 

 Fig. 6. Eighth ? caudal vertebra from 



above (No. 15,700) . . . 366 

 F'g- 7- " Tenth? dorsal vertebra from the 



right side (No. 15,700) . . 366 

 Fig. 8. Third caudal from above (No. 



15,700) . . . . . 366 



Fig. 9. BORHY^NA TUBERATA : Fourth ? caudal from above (No. 15,701). 351 

 Fig. ga. " " Fourth ? caudal from the right side (No. 



15,701). 

 Fig. 10. CLADOSICTIS LUSTRATUS : Lumbar series from the left side (No. 



i5-'7o) 381 



All the figures are natural size. 



(VOL. iv.) 



