452 PK0P. W. J. SOLLAS ON" A NEW SPECIES OP PLESIOS A TJET7S 



variations which occasionally appear, as, for instance, in'the twenty- 

 eighth vertebra, which is longer not only than its predecessor, but 

 also than its successor ; the same is also the case in the thirty-sixth 

 vertebra : the difference is too large to be explained as an error of 

 measurement, and can scarcely be the result of mechanical compres- 

 sion ; it seems rather to be concomitant with that wide departure 

 from the ordinary Reptilian type which the Plesiosaurian neck 

 presents. 



Table of Measurements of Cervical Vertebrce. 





Centrum. 



Total 

 height. 



Zygapo- 

 physis 

 to 

 base. 



Zygapo- 

 physis 

 to end 



of spine. 



Zygapo- 

 phySis 



Neuro- 

 central 



N"euro- 



eentra! 

 suture 



*N"nm Jiat* 



.Ll UJ-LlUCl 



of the 

 vertebra 



Length. 



Breadth 



Height 



to 



Zygapo- 



suture 

 to 



to 

 costal 



of 



vertebra. 





(a.p.) 



(1.1.) 



(d.v.) 







physis. 



base. 



pit. 





1. 



2. 

 3. 



112 



075 



1-4 





1-9 







1-2 



0-4 



3. 



4. 



1-25 





1-4 





1-9 





21 



1-1 



0-4 





5. 



1-25 





1-4 





20 



1-35 





1-1 



0-4 



5. 



6. 



1-375 





T4 



2 ; 9 



2-0 





2-3 



11 



0-5 



7. 



1-375 





1-5 



2-95 



2-0 





2-3 



1-1 



0-5 





8. 



1-375 





1*5 



2-95 



20 



1*45 



2-3 



1-1 



0-5 





9. 



1-375 





1-5 



3-2 



20 





2-3 



11 



0-5 





10. 



1-7 





1-5 





2-25 





2-45 



1-05 



0-5 



10. 



11. 



1-7 





1-7 





2-3 





2-45 



1-2 



0-5 





12. 



1-7 



1-4 



1-7 





2-45 







1-2 



0-5 





13. 



1-8 



1-45 



1-75 





2-45 







1-4 



0-5 





14. 



1-9 



1-4 



1'9 





2-4 



1-9 





1-4 



0-5 





15. 



20 



1-5 



20 



4-0* 



2-6 



21 



2-75 



1-5 



0-6 



15. 



16. 



21 





21 



46 



2-6 



2-2 



2-85 



1-55 



0-7 





17. 



2-2 





21 



4-8 



2-6 



2-45 



3-05 



1-55 



0-7 





18. 



2-2 





2-2 



5-1 



2-8 



2-45 



3-05 



1-5 



0-7 





19. 



2*2 





2-2 



5-2 



2-8 



2-65 



3-2 



1-7 



0-7 





20. 



2-2 





2-2 



5-4 



2*8 



2-8 



3-2 



1-7 



0-8 



20. 



21. 



2-3 





215 



54 



2-8 



2-8 



3-4 



1-45 



0-65 





22. 



2-2 





2-2 



5-6 



2-8 



2-8 



3-4 



1-5 



0-55 





23. 



2-5 



2 : 3 



22 





3-0 



2-9 





1-8 



0-75 





24. 



2-55 



2-4 



2-2 



5-85 



3-1 



3-0 



3-5 



2-0 



0-7 





25. 



2-5 







6-6 



3-4 



3-3 



3-7 





0-7 



25. 



26. 



2-5 





2 : 25 



6-4 



3-5 



3-1 



3-55 







27. 



2-65 





2-35 



6-55 



3-55 



3-45 



3-7 



2-2 



0-8 





28. 



2-75 



2-45 



2-5 



6-8 



35 



3-65 





20 



0-8 





29. 



2-6 





2-6 



6-8 



35 



3-85 



3-7 



2-3 



0-75 





30. 



26 





2-65 



6-8 



3-6 



36 



3-7 



2-3 



0-7 



30. 



31. 



2-65 







71 



3-6 



3-9 



3-9 



2-6 



0-65 





32. 



2-5 







7-1 



3-7 



3-98 



3-9 



2-4 



0-5 





33. 



2-625 







7-3 



3-7 



4-0 





2-6 



0-5 





34. 



2-6 



3-3 



2 : 7 



7-5 



3-8 



4-25 





2-7 



0-2 





35. 



2 69 



3 5 



2-7 



7-7 



3-8 



4-4 





2-8 





35. 



36. 



2-75 



3-5 



2-75 





3-8 







2-8 







37. 



2-6 









3-55 













38. 



26 



3-625 



2-725 















38. 



