SKELETON OF EEGALECTJS AEGENTETTS. 33 



PLATE VI. 



Fig. 20. The first five vertebrae, with the corresponding pterygiophores and fin-rays. 



Nat. size. 

 Fig. 21. The atlas, seen from the front. Nat. size. 

 Fig. 22. The thirty-second vertebra, from the left side. Nat. size. 

 Fig. 23. Longitudinal vertical section of the seventy-fourth vertebra. Nat. size. 

 Fig. 24. Transverse section of the seventy-fifth vertebra. Nat. size. 

 Fig. 25. The last two vertebras with the corresponding pterygiophores and fin-rays. 



Nat. size. 

 Fig. 26. Longitudinal vertical section of the last vertebra (demivertebra). Nat. size. 



vol. xii. — part i. No. 5. — February, 1886. 



