GRAITOLITKS OF NEW YOHK, TAUT 1 769 



Tetragraptus clarkei sp. nov. 



Page 85!{ 



11-13 Different aspects of young rhabdosoraes. x2 



14, 16 A mature rhabdosome, enlarged (x2) to show more distinctly the 



character of the thecae ; and the same in natural size 

 15 Young rhabdosome, showing a rapid widening of the branches 

 Graptolite bed 3 of the Deep kill section 



Tetragraptus pendens Elles 



Page 653 



17-19 Three different aspects of mature rhabdosomes ; figure 18. xl^ 

 20 Enlargement of fragment of branch. x6l 

 Graptolite bed 3 of the Deep kill section 



