172 



REVISION OF THE PELYCOSAURIA. 



Plath II. 



Fig. I Inner view of quadrate of Dimetrodoji indsivus, No. looi University of Chicago, 

 showing method ofattachmentofpterygoid and the foramen quadratum. X i. 



2. Lower view of the basisphenoid of Dhnctrodon incisivus, No. i University of 



Chicago. X >4. 



3. Lateral view of same. X ^. 



4. Quadrate of same. X J^. 



5. Inferior view of pterygoid of same. X Y^. 



6. Lateral view of pterygoid of same. X J^. 



7. Superior view of basicraninm of same. X >^. 



8. Lower view of same. X Y- 



9. Upper view of articular region of lower jaw of same. X yi . 



10. Lower view of same. X yi- 



11. Lateral view of same. X J^. 



Platb 12. 

 All Dimetrodon indsivus, No. i University of Chicago. X yi. 



Fig. I. Lateral view of atlas and axis. 



2. Anterior view of same. 



3. Posterior view of same. 



4. Anterior view of an anterior dorsal of same. 



5. Lateral view of same. 



6. Anterior view of a more posterior dorsal. 



7. Lateral view of same. 



8. Anterior view of same. 



9. Lateral view of a lumbar. 



10. Lateral view of three posterior lumbars of same. 

 I T Anterior view of the first of the same three lumbars. 



12. Inferior view of same. 



Plate 13. 

 Fig. I. Vertebralcolumnof 77/f;c//«^rar^/r(7rr;,?a, N0.4155 Am.Mus.Nat. Hist. X ^. 

 ' la. Caudal series of same specimen shown in figure i which in the specimen con- 

 nects with the sacrals. X 34. 

 Vertebral column oi Dimetrodon indsivus, No. 4008 Am. Mus. Nat. Hist. X Y^. 

 Posterior portion of vertebral column of Dimetrodon indsivus, No. 4040 Am. 

 Mus. Nat. Hist., from the last lumbar to the ninth caudal. X Y^- 



2. 



Plate 14. 

 Fig. I. Femur ofZ^mf/^Ww/Zwrn/iw, No. I University of Chicago, posterior view. X Y^- 



2. Same, anterior view. X Y^- 



3. Humerus, same. X >2. 



4. Tibia, same. X Y^- 



5. Top view of tibia. X >2. 



6. Ulna of same, anterior view. X >2. 



7. Ulna of same, inner view. X >2. 



8. A fragment of the maxillary Dimetrodon sp., showing the depth of the tooth 



sockets; No. loi 8 University of Chicago. X about >^. 



9. A fragment of the maxillary of Dimetrodon indsivus showing the size of the 



canine ; No. 78 University of Chicago. X about >^. 



