Did/ymogrti/ftMs stage 



Tei/ragra^tus 



Mvliiramoua 



Didymograptus forcipifer 



Didyniograptus caduceus 



Did. nanas 



Did. bifidns 



Phyllograptns angustifolius i 



(Tetragraptns phyllograptoides) 



I 



Tet. py^raaeus 



Did. indentus 



Tet. (postlethwaiti) 

 Tet. clarkei 



Tetragraptns similis Tet. fruticosns 



Brvograptus pusillus 



! 



(Bryogi'aptue kjerulfi) 



Tet. pendens 



I 



Bryograptus 



Staurograptns dichotomus 

 var. apei'tus 



SUGGESTED PHVLOGENY OF THE AMERICAN GRAPTOLOIDEA AXONOLIPA 



Did. cuspidatus 



Did. ellesi 



Did. nicliolBoni 



Did. acutidens 



Tet. taraxacnm 



Tet. «p. 



Bryograptus lapwortbi 



Coenograptus gracilis 



Did. similis 



Did. gracilis 



Did. faifcrmiB 



Did. extensns Did. patnlus 



Tet. lentns Tet. quadnbrachiatns 



Tet. headi 



Sigmagraptus praeonrsor 



Dieli. pentad type 



I 



Dich. hexad type 



I 

 Dich. septad type 



Dich. octobrachiatus 

 Loganograptus logani 



Goniograptus geometricus Goniograptus perflexilis 



Clonograptus 



Did. arcnatns 



Tet. 



Tet. amii 



Dich. octonarius 



Temnograptus noveboracensis 



Clonograptus 



