308 R. R. GURLEY 
SUPRA-ORDOVICIAN 
Genus and Species 
Upper Silurian 
Devonian 
Lower 
Carbon. 
Clinton | Niagara 
Upper | Hamil- 
Heldbg.| ton 
Choteau 
Diplograpsis? dubius* ..................-.-. 
ALOMAtOCE LASS strc te eet eC) tener ates 
GlinttOnense neice cer cree cea erewe a erin: 
convolutum’ Coppimngenisiyy se ene 
(QUE VebVollitnssnn ey asic rin clots eng atuciols Gach guard postodcce 
SPOS Te eee ents iat oma olan a alone 
Dendnrogmap tus cheek te ier cee 
Palestro avi Mics a NIGIG etd auto BI ovo 101s Gis O16 6 ero rons 
Poh ON RDKS Urea he yigitaeee MIRC erence Gare i ccicen opie 
IRONGIOUS. Goce se devo gocdooonsocea co boo oodE 
nowellis eee SACI Le a SEs pee ot SET RE eh Zig 
PTAC STA CIS elect hia er tals ite eee ele 
TATIUO SUSIE ee eee a TUE on SISA Sra teat ee Ea 
: S[OINOSNS oo daloodg06n0ondgdanouccosoobodGR 
Callognalptspemeie ecescieta te Sara) sue acta sgemaeetrehs 
PEIN Gos SaoGoo Boon Wer sooTS O005.9000 code 
STANT ONO ADI ee ete mele Senta na GRRAC aR CE eect na no Win ioaas 
TUNCUSAUT Sete eee Ee Sees see neg See cree i 
EK ENCONSIS 5565 500c ded avonoGoO DO DOOD EGOS 
Dicty,onemal ore. see eee een een 
ISLE res ee taree al eae bereiiton We Net eaten uaa a nl ay Gvd a OMe tn 
expansum ....-‘ si Rata ity Stier py esa eer 
fenestra tum eerie eh lore cicten tesreeaearecice es 
ERENCE. ooo con bODU OD ARSD OHEE 160d S00 0008 
ET EHNOVOLUID EDU laa eeL eee crated rad creo o ooo Bao ua 
jaIeIION) Sy duindbandagsoogsacsochoy oboo ac 
JOSIKEIMUIS 6 560 000 sG00 soba nGoDGDOoO Nb OOO od 
RAT HHUOVGIN Std tee ea teanlo ecto y cudinlo Seabee nats 
SCallanifonmlen tad o OSS eee oes 
GOUGING soo codcuns copacdoo dodo onde Gade 
(uevavel Uhh or WedieeU Big heen MEKaarre aL dig aac ata a cole 
Wi D SHERI: 252 oe baxinc ease cteet ae rou cee noel ea meme ae pet cat 
IDYSSONOAAOUS sscagoccvooodonsdgv0Ko0 ae bone 
GEVONIUCUS Mahe Veen ey a ons LCE Monee rc 
EallyptognapSUSH ea ace ee nce eee re 
CHAMMEIONAINIS o550 6000 400550000000 voo0ccae 
TMIGROMGUNEMHOGIES oso0000ccc00c000 vod0se00DS 
PACTS, Ae vac rey we Gores tes te sca esr amaurosis ayo 
SubretiformiSmsac ce ee eee eee 
INIMMORBOSHS coop oo nocodoccsn s0b0 0cdv0 aERS0S 
Dt OSWS! =< ei eee ae Teo eee ieeass leks 
Atcantho cra pSUSmi ee eer ee 
granti ... 20:90 
RUINS Genco dooosio bons coeeedon0d oo co00DE 
INDO CEUSRomeiae maou oo eO Ameo b's COuS Geos 
LIMEISONMONCE, scoooodosacdooodcesacvcagupe 
bellaseesicsees oe 
CEEVIC OLS: a arene Cheer See Se Cees 
GUILE TIS) ioe sis ce eope Ree Ete eee esis 
nn nn a Jvnnn| onnzonwl 
a 4 
25> |ZEl ot She | 
HG 
