254 



Transactions. — Zoology. 



posterior articular surface of the mass is nearly circular, and 3 inches in 

 diameter. 



The first dorsal has the neural arch incomplete, but all the other vertebra in 

 the middle of the column have their expanded processes largely developed. 



The cervical mass has six lateral foramina and seven overlapping laminae in 

 the united neural spine, for which reason I conclude it consists of seven 

 vertebral segments. Following this, the first dorsal is very feebly developed, 

 with the neural arch open above and short styliform lateral processes. The 

 second has a complete neural arch, but the spine is low. The lateral process 

 is also short and slender, and like the first has no costal facet. 



The third to thirteenth dorsals have articular indentations on the broad 

 outer margin of the lateral processes, but these become gradually indistinct. 

 This agrees with the character of the vertebral end of the ribs, those belonging 

 to the fourteenth, fifteenth, sixteenth, and seventeenth dorsal 

 tapering as if they had only a ligamentous attachment along their posterior 



segments 



border. 



Mr 



a remarkably acute angle backwards on the vertebra. 



The transverse processes of all the vertebra behind the second dorsal 

 are greatly expanded and very thin j thus, that of the eleventh dorsal is 5.5 



inches wide by 6-5 inches long, the neck of the process which spri 



o' 



from 



be in 



I 



They occupy nearly the same place throughout in relation to 



ertebra 



The 



~~, v «.« **„ v**^ » * ■ »»■ '■ ~ V »««~ 



begin to slope backwards and soon become very oblique. The centra also 



rapidly increase in length, that of the twenty-eighth being the longest. The 



measurements of the centra, taken without the epiphysial disks, are as 

 follows : 



Vertebrae. 



1-7. Cervical mass 



8. 



9. 

 10. 

 11. 

 12. 



13. 



14. 



15. 



16. 



1st do 



2nd , 



3rd , 



4th , 



5th , 



6th , 



7th , 



8th , 



9th . 



17. 10th 



18. 11th 



19. 12th 



20. 13th 



21. 14th 



22. 15th 



23. 16th 



24. 17th 



sal 



• • • 



• • * 



• f • 



(first with a rib) 



• • • 



• * • 



• • » 



• • • 



• • • 



• • • 



■ a * 



• • * 



• • • 



• • ft 



• ■ ft 



• - - 



• * 



25. 1st lumbar 



(last rib) 



a » t 



• • 



• • • 



- • • 



• ■ • 



* » • 



• • • 



• • • 





in. 



Vertebrae. 









• t • 



3 6 



26. 



2nd lumbar 



a ft V 



• • • 



•8 



27. 



3rd 



J> 



• ft ft 



• * ft 



• • ft 



•9 



28. 



4th 



99 





• • ft 



• ■ » 



1-2 



2'.). 



1st caudal 



(with 



chevron ) 



9 • • 



1-6 



30. 



2nd 



9 9 



ft • ft 



w 

 III 



• * ■ 



21) 



31. 



3rd 





• • • 



^r ^r W 



• • 



ft • ft 



2 3 



32. 



4th 



a' f 



J 9 



• • t 



• » t 



• * • 



2-6 



33. 



5th 





• | • 



ft • • 



• • 



29 



34. 



6th 



w 



(last neural spii 



1 • • 



• • ft 



3-2 

 3 3 



1 «L *- ■* 



35. 

 36. 



7th 

 8th 



99 



99 



• t • 



• • • 



ft ■ ft 

 • ft ■ 



• • • 

 a • • 



• a v 



3 5 

 3 6 

 3 6 



37. 



38. 

 39. 



9th 

 10th 

 11th 





• * ■ 



• • # 



• • * 



* • • 

 ■ ft ft 



• • • 



39 



40. 



12th 



7 * 



9 • • 



WWW 



■ 4 i 



• ■ • 



4 



41 



13th 



7 7 



I § s 



• w w 



A A X 



• • • 



41 



42. 



14th 







• • • 



ft • ft 



4 3 



43. 



15th 



% * 



* # • 



• • • 



ah ■> afft 



• • 



4-5 



44. 



16th 



7 7 



79 



a»» W 



• • • 



W V • 



• • • 



« • a 



in. 

 46 



47 

 4 8 

 4 5 

 42 

 4 

 3 5 

 33 

 2-8 

 1-8 



1-5 

 1-4 



11 



1-0 

 •8 

 wanting 



f ft § 



• . ■ 



* ■ 



• ft • 



ft ft • 



ft • a 



• • • 



• f ft 



99 



a ft • 



•6 



3 



