LYMNZIDZ OF NORTH AMERICA. XIII 
Page. 
Effect of the Glacial Period on the Lymnzid Fauna of 
WANS ETE IGE Y Dec Rk aR Re Nae ld ne) AR A 75 
Post-elacial and Pre-glacial Species... 20.0. .....0eccece oes 77 
te. inligeraplly. Gl VWWOtksS CONSUIEGs. 02. s2a.c.cec as sss dadese. sees 79 
UW OMSIDIGI Bg bh seen a0 78 [ih Ce ea ee 80 
Ne aed Cet NO CIS SIGS IMIE occ lRE E82 carats io Se" sage Dim wis os Ory aeeia sis 80 
Systematic Table of Extinct American Lymnzas........... 85 
Stratigraphical Table of Extinct American Lymneas........ 86 
B. Descriptions of American Fossil Lymnzas..............0000. 87 
ASOMIAne MEAT PL VAMNCAS chy cls ah sce wraicl-ls c,d Soe slots ada ee ken 87 
CrchacomuslyiMmredG why cla Anse dt ysis-. Werk iciaiaiertine oie Me dees 89 
Bow ernaocen emo yin nccdSean seh cescutsc acco t ol cele ikeles cite nine 95 
Middle: Te ocene Wayinnceas’ hots a4 fecccelts ae aks es bo raeeeinee 95 
Oliomceiesme x tamieeds. cia. oie ot Sc cad hereon re tiie elein citi eke aaa 97 
Maddie Migceneeymniteas |.) see cites filo ols ob ove no. 6s tennis 102 
PEAT iGeC SERS Sule VENT EAS east oa. koa 5 oo) hs esac nie Guovaiivalc tela Wigice aR 102 
Pleasiereency, Lymiatieea S| A leh ese A cle hoc a Sparel e ates etic a eae 105 
Doubtful Lymnzas and Species wrongly referred to this 
PAMETAN Cae See SAO Ada Tn Gill Sevacs aid ok cic REA OAL am altos 109 
C. Bibliography of American Fossil Lymnzas..................005 111 
Wen Elistorical sketch ot Previous Monographs... .. 22.05 0560 se. ceccsce 117 
Wileue Awe New Glassiiicationson the leyintteds. $2.2. sss eles. oe nd dle donc eae.s wie 120 
(General IDGSTSINOM "5.65.6 6S Co RES BCRSIEEIGO OI oeidc: Ariane nore oneae 120 
Key to Genera and Subgenera of Recent American Lymneas....... 125 
Pxeronieata! Groups of Ieyminceina.. {2 002. 225026 o5 ee in lec eee wes 127 
Wl ARSE VT ELS) Syria ae eS Qe a me Mela ee 129 
VIII. Instructions for Collecting and Preparing Lymnzas................. 131 
[PSer OVS Lematic DISCUSSION Of SPCCIESis oc = oi os 0:5 sce: ccoisie cicis Sieve o MBs Sreiaiwiele wl eiete 133 
anmly ILSAvitioiny.o: 1Biro6l Se Ga ane Ome aeeotce eam rat OAc a oUecdGOC 133 
SP vines] Vaal Beg cine, tee. 0 1D 2) | ree emer eta A Sc. 133 
eas alenaner A, IGIBte fos au. i sco 8s ad os vsleele e's Baweldlajung te ae 134 
LO SHUG ATES PLLC SIAR ae eNO occ sogucnc 136 
TERSICANAUSIGPPTESSE SAV: cici)eelacicicc + cea aaa eee eter: 137 
iestaenaus perampla: Walker 3522.2. 60. ccusducueemt er 151 
L. stagnalis wasatchensis Heinphill ..... 2.2... cccee ewes 152 
EA SOSHOLS HUAN, Baker. Joos aco daeiccies ieee nee 153 
L. stagnalis sanctemarie Walker ............0..+20e000: 156 
ESstasnalis occidentalis Fremphill’ (02. 22-22. «oer eel 160 
ie Sarat |... .. 62 oe a ore ewe eee See 161 
Census ESeUmOSMCCINES Baker’)... 0222 Saha Woke s esate ee 162 
I< GOGH USC EA AOERSO RIES S.C ACOROOIOO OA OS AOoIbS 163 
ipercoimela chatyoea (CGould)*2 22s iseme en teen eee 171 
ipacolmmellaccasta’ (Lea)! .2 2 4o sce te nteeis cea cet 174 
P. columella championi (Von Martens)................- 175 
PRS EONCUSEE (COC) © on fra ce ace ci eS Se see tele 176 
NG CMS RENDER: WUOTELOME... ciate, sc\cicn 0 trian sae MeeEG coe elelere elaine 178 
TOACULICUIOF IGM ATING) :.0.. heroes ae eee eer ne eon ee 179 
