EXPLANATION OF THE PLATES. 



Ill 



EXPLANATION OF THE PLATES. 



PLATE I. 



Figs. 1-12. Vertebrae and limb bones of Polycotylm lalipinnis, Cope, from Kansas ; (sec p. 34) one half tho 

 natural size. 



1. Profile of separated neural arch of a dorsal vertebra from the left side. 



1 a. Posterior view of same, showing deep compressed basis of the clovatod diapophysis. 



2. Dorsal vertebra : 2a, the same from below. 



8. Another dorsal vertebra posterior view ; 3a, tho same from tho left side. 



4. Another dorsal, from a position less median than the last, anterior view ; 4a, tho same from tho left side • 4b 

 tho same, inferior view. 



5. An anterior caudal vertebra from behind, exhibiting the surfaces for chevron bones ; 5a, the same from below. 

 <>. A more posterior caudal, obliquely crushed, showing proximal end of one limb of a chevron bono in place. 



7. Two ooiissiued cervical vertebra! from below ; 7a, the same from the side, the neural arches being lost. 



8. Proximal end of supposed ilium, external view (p. 37). 9, the undetermined bone. 

 10. Tibia; 11, tarsal bone. 



12. Metatarsal and phalanges. 



18. Portion of cranium of JIolops bremspiiiis, Cope, from above; 75 of the natural size. From Tinton Falls 

 Monmouth Co., N. J. In the cabinet of Rutger's College, N. J. 



14-15. Hypnhcma laticavda, Cope, from Sampson Co., N. Ca., one half the natural size. In the state cabinet 

 at Raleigh, N. Ca. 



14. Right external metatarsal. 



15. A caudal vertebra ; 15a, inferior; 15b, posterior views. 



16. Taphrosphy* nodome, Cope, one-half natural size, from llornerstown, Monmouth Co., N. Jersey. Portions 

 of two costal bones. 



PLATE II. 



Figs. 1-9. Elazmomnru* platyurus, Cope, from near Fort Wallace, Kansas. Fig. 1, one? forty-fifth natural 

 size; figs. 2-10, one-third the natural size. 



Fig. 1. Restoration of the skeleton of Elasmosaurus plafyurus, Cope. Tho limbs, and the cranium behind the 

 end of the muzzle, are entirely hypothetical. 



Fig. 2. Three caudal vertebra, probably eleventh to fourteenth, seen from the left side ; 2a, tho same soon from 

 below. 



Pig. 8. An anterior median dorsal vertebra, seen from the articular extremity ; 3a, the same from beneath. 



Fig. 8b. A median dorsal with subquadrate section, from beneath. 



Fig. 4. Anterior dorsal of tho same, from the extremity ; la, from below. 



Fig. 5. Two median oervicals, from tho side ; a, from below. 



