GKAPTOLITES OF NEW YORK. I'AUT 1 765 



Tetragraptus fruticosus Hall (sp.) 



Page 849 

 See pi. 10 



1 1 Sicula and first theca ; pyritized. x7 



12 Young rhabdosome consisting of sicula and first two thecae ; obverse 



side. x7 



13 Early growth stage of rhabdosome, retaining nema and a portion of the 



primary disk. x7 



14 Young rhabdosome preserved in relief; shows the apical origin of the 



first theca, the growth direction of the first thecae. the sicula in 



obverse aspect, nema and primary disk. x8 

 All the originals are from graptolite bed 2 of the Deep kill section 

 with the exception of that of figure 11 which is from bed 3 and is doubt- 

 fully referred to this species. 



