756 NEW YORK STATE MUSEUM 



PLATE 5 



Genus bryograptus Lapworth 



See pi. 4 



Bryograptus lapworthi sp. nov. 



Page 639 



1 Young rhabdosome consisting of sicula and first two thecae, referred with 



doubt to this species. Shows apical origin of first theca. x8 



2 Obverse side of young rhabdosome with two more thecae. Shows also 



apical origin of first theca. x8 



3 Rhabdosome with four branches of the second order. x2 



4 Rhabdosome with five branches of the second order 



5 Rhabdosome with relatively small angle of divergence. x2 



6 Rhabdosome with large angle of divergence. Branches of the second order 



are absent. x2 



7 Rhabdosome with symmetric formation of branches of the second 



order. x2 



8 Specimen with very large angle of divergence. x2 



9 Very asymmetric rhabdosome. x2 



10 Very large specimen with very distal formation of branches of the second 



order. x2 



11 Enlargement to show the mode of bifurcation. x8 



12 Young rhabdosome with nema and primary disk. x7 



Graptolite bed 2 of the Deep kill section 



Genus sigmagraptus gen. nov. 

 Sigmagraptus praecursor sp. nov. 



Page 702 m 



13 Rhabdosome. x2 I 



14 Sicula and first two thecae, presumably of this species. x7 



Graptolite bed 3 of the Deep kill section 



