Annals N. T. Acad. Sci. 



Dictyoneraa flabelliforme 

 v. acadica 



Shape and eize 



infundibuliform ami 



pyrifonn 



large— very large 



infundibuliform 

 medium size 



nfundibuliform 

 large ? 



vasiform— cylindri- 

 cal 



medium size (large) 



nfundibuliform 

 large 



Length ' 



.8:1 

 CO 



9-10 

 (8-12) 



.4 (.3-. 5) mm 

 subparallel 



subparallel 



subparallel 

 (desmoid) 



ubparallel — 

 parallel 



robust 

 rb parallel 



.l-.2mi 



regula 



rigid 

 .4-.9 mil 



quadrang. 

 (elongated) 



quadrang. 



subquadrang. 



quadrang. 

 (regular) 



rectang. 

 subeircular 



Numl>er Character 



<lelicate 

 projecting 



Basal organs 



sicula, nema 

 ? 1 stolon (young s 



sicula, 



1 basal disk 



? 1 branching stolon 



Voldmb XXII, Plate XXII 



ng into Char, of stage Evolution and age Preservat: 



conferta 

 norwegica 



ruedemanni]. 



ruedemanni 

 (pyrifonn link) 



acadica 

 (conferta) 



early stage bryo- 

 graptoid 



late stage with 

 mixed features 



neanastic 



'ith thickened 



branches 



early stages : 



bryograptoid ; 



late ephebastic 



contraction 



char, of var. 



usually restricted 



to late stages of 



acadica 



center of variability 

 true Dictyonemas 



Onondaga 



not any evolution 



90% of later 



ephebastic 



stages broken 



20% of later 

 eph. stages 



nfundibuliform 

 large 



irregula 

 .4-.9 rat 



rounded 

 subquadrang. 



distally 



des in ograpto idea 



nfundibuliform 

 medium size 



subparallel — 

 flexose— 

 joining 



very irregular 

 .l-.4mm. 



irregular 

 subovate 



delicate 

 less projecting 



char, of var. 



usually restricted 



to late stages of 



acadica ; 



acceleration be- 

 ginning 



to genus Desnio- 



graptus, up to 

 middle Devonian 



infundibuliform 

 medium size 



very rare 

 irregular 



elongated 

 subovate 



basal parts with 

 Dictyonema char- 

 acter 



infundibuliform 

 medium size 



undulating (thick) 

 joining 



very rare 

 irregular 



elongated 

 subovate 



chitinous basal 

 expansion, 



Beekmantown ?— 

 Chazy 



v. ruedemanni 



infundibuliform— 

 pyrifonn 



large— very large 



(.63:1) 

 (1.1:1) 



thin— irregular 



ubparallel 



quadrang. 

 elongated 



Bicula, 

 nema or stolon with disk. 



branching stolon i 

 neanastic stage 



acadica 



conferta 



(pyrifonn link) 



old stages partly 

 callograptoid 



further coolution 

 into Callo- and 

 Dendrograptus 



subparallel - 

 parallel 



quadrang. 



irregula 



cyatiform 

 medium size (large) 



(.6 at the base) 

 subparallel 



delicate 

 irregular 



quadrang. 

 elongated 



13-14 

 (20?) 



basal stem and disk 



infundibuliform 

 nail— medium si/. 



subparallel 

 (flexose) 



very feu 



irregular 

 appressed 



thin hydrorhiz 



partly dendr< 

 graptoid 



partly well 

 preserved 



