DavidRoyHunter.pdf

DiSC"!5iOn'I.Formspe"iUCOnSideredbelOngingtotheg"nus~
o\'!Itndus.havebeenreported frllllstrata rangIng in age through DlOllt of
the Ordnvic\.an in both the Midcontinent and No(th AthntiC Provinces
(Bra"s01\andMehl, 1'133, 1'J3t.;Rhdes. i'J53; Lindsrrn... l'J55a.lo;ebers,
1966).
\.indstrom(1971),hUdiffe...ntiacedthet""species~
dito,...,.of D. foneps havealov and long bas," "ith a amaH "ndulation of
the abofO degreeS. This spedes is recovered from Middle and upper Ordovician
nrata (\lebers, 1966; ll1ik, 1976). The ..icrostructure of this species
show. little "hite rarter it allY ac all (Barne~·!!..:....!!' 1973).
The o\.stod1!otll nf orepanoisrodus n·; 51'. A has a 10"1'. s.tnighr
cusp and relatively 1_ .~d short base. "hili' an antero-basal angle of 60
to 80 degrees ......terlo..ly tlle e1e....nt is so"",..hat pointed.
E"cepr tnr the· nistOdifoffl"S,
the appantu"e. nf these four