682 
Page 
Cyclotus (Aperostoma) dysoni, 
var. multilineatus ...... .. 597 
giganteus ..... eee. 8, 598 
—— fiGANteUS oo ceevsceeeees 2 
—— (Aperostoma) irregularis.. 3, 
596 
—— (——) ——, var. pittieri.. 597 
UTEGularts vessvceveree 2 
—— MEXTICANUS cv vecevecaees 5, 7 
transluctdus.....ceesees 4 
CYLINDRELLA .....+08-. 286, 637 
Cylindrella ..cecec scene 253, 254, 
. 255, 273, 283, 607 
ACULISPITA ve ve ee ences 271 
——- aptostoma ......00 eee 283 
arcttspird .. se... ees 271, 272 
——_ aristisptra ..eveveveeee 272 
—— attenuata ....cecscveees 271 
—— berendti.....cccceccecces 281 
—. , var. albida ......4. 281 
— blandiana ..........006. 258 
boucardt .isccecee evens 262 
bourguignatiana .... 286, 637 
CLAVE voce eee cece ences 270 
coahuilensis ........008. 279 
CONCISE oe cecceecseceuee 287 
COSEULALA Lo cece sce eeaee 284 
CTCEACER vise sevcceens 279 
CLOSSEANE wo. sec eee eens 272 
cylindrus ...... 60. 255, 266 
decollata ...... 259, 260, 263 
ecurtatd vivecevcsceves 261 
denticulata ........00e. 289 
deshayestand.....see000. 263 
edwardstand ov sesseaes 262 
—— filicostd . 6. ee ccvaceees 272 
Jistularis wevccccvevcees 272 
GASSUCSE 6... cece eceeeeee 2838 
GOUT. oc cac cc neveees 276 
—— ghiesbreghti ........0065 255 
GONIOSTOMA vevreseceaee 280 
—— JANIS ve vce ccc venvees 261 
—— hyalina .... ccc ccecene. 266 
TMB ICALA oo. e cece evens 273 
MSEUGNIS oe eee ec eeeeces 259 
VWebMannt or. ccc cecccee 266 
——_ MEXICANA «0.1... 0s 260, 261 
—— microstoma ........000. 278 
—— moreleti.... 6. ccc cccevee 271 
morint..., 284, 285, 636, 637 
Ui 263 
PAllida .ivcecvscsccenee 286 
—— pfeiffert. ccc cc ccccecees 280 
—— piloceret ......444. 277, 278 
—— polygyV@ vee ee ccevevaee 284 
polygyrella wiv cccssveee 284 
INDEX. 
Page 
Cylindrelia pulchella.....s000+ 285 
TECHCOSTA oc cee careeves 265 
TEMONAL sevvseveveceee 279 
SAYPINE vvevevevrveneees 285 
—— SpeCi08A... 1.64 258, 262, 263 
spelunce ....++. 284, 636, 637 
_— , var, dubia .......+ 636 
——- splendidd ...... csc cee 261 
—— subtilis ..... cee eens 284, 637 
SWIUTKANA . ec ceveenees 284 
7 279 
COMACEUA cis svvvceveues 271 
CANSUPEVEA v.ccevcreees 264 
trocheformts .......0es 266 
—— EFUNCATA cre vvceceecnes 264 
UYONE ce cecceccveeecce 276 
—— EUITIS cere vncenvens 270 
——- walpoleana .......e008 259 
WalpOlet. ..ccsesevecceee 259 
CYLINDRELLIDE ........0005 253 
CYProgenta .icseccsecceeens 480 
Cyrend oo... 00s 540, 541, 548, 550 
LL 547 
—— e@quilaterd ....cccseeee 549 
—— equilateralis......6...0- 549 
AUIS. veer evn vccneeves 546 
—— anguldta ..eccvccvceees 548 
—— carolinensis ........00e 540 
——_ COPAALA vc ceeccvccccnes 546 
—— cordiformis .........00e 549 
———  CUDENSIS 6 eee reecccees 592 
—— cumingti |... cece 550 
CLYUUSUEA Lovee cece evans 547 
Jlortdand wiveeevecccaes 548 
fontaine? .......66. 541, 546 
GETMANA vevececeverees 547 
——_ NflAtA iv ceecccvcccaes 549 
—— maritima .......... 549, 592 
—— mexicana .. 546, 548, 549, 551 
—— — , var. altilis ........ 546 
——— NICU AGUANA . eee re vaeee 544 
— , var. radiata ...... 545 
OUVACEA. . cece ce eeeee 541 
PAUNAMENSIS .osvseseceues 549 
PLACENS Were e cece eeceees 545 
PLACA ov veevveececnees 545 
——- pullastra ..cccccceceuee 547 
——. FAMED Lecce ecceane 545 
PECIUR Liv cecesccnccees 549 
salmactdd .... 00.6. eens 598 
SOUAA .ieceeccecee 544, 545 
Re i, 547 
CPUANGUIA wore eee ee aee 546 
triangularts ........00. 546 
LL 548 
Page 
CYRENIDH oo... cee eee ee eee 540 
Cyre OCapsa ......4. 541, 543, 592 
SAIMACIAA eee cece ee nee 541 
CyrtOntas oo ccccccccccees 481 
Cyrtotoma wiveececcccceceees 1,7 
MELUCANUM viccecececes 7 
SALICANUM 6. ccc ccceecee 8 
Deedalochtla oo. ccvcceccccues 162 
acutedentata ...... 0.0 ces 172 
AVIAAUNE vv vevevccvveee 171 
—— DEATID ccc ccc eeee 171 
——- hindst oo. ce cece ceecees 169 
MMplicatd vivceccceeeees 164 
1 172 
——— MOOPEANA Livecevvecvves 165 
TCXASUANA ve ccvcccccvees 170 
—— tholus ..ccecccccaceces 166 
vEentrosuld vv. vevececes 169 
Delphinonaias 6.0... cece. 481 
Diplodiscus vi cccccsececeees 395 
Diplodon wivvcccseveees 648, 649 
DIPLOMMATINA ........55 20, 601 
—— huttont ve ccccccccccaes 21 
LWMeNstS. ve ccc cccceceees 601 
occidentalis ..... cece eee 601 
50) 0 20 
stolid oc... eae 21, 601, 656 
CUCMA .caeccccvecseves 601 
Dipsas plicata vo. cevcceveves 521 
Discoconulus gundlachi........ 122 
Disconatas ve vvevcccccceces 481 
Discus vieivcccecccenes 113, 621 
OMJACENSIS . se sees veces .. 137 
suturalis ..cvcccvcccues 186 
Distomosprrd. co ccvcccveveees 634 
 Dorcasia voc vccccccccuacecs 138 
berlandiertana .......00. 140 
GVUSCOLA. Levee ceeenees 141 
Doridium vivcccceccsvccesees 147 
Draparnaldia wi... cece eee 477 
Draparnaudia .o.cecevcceeee 477 
DREISSENA ... ce cece cece eae 476 
Dretssend .iccccccecevcveces 477 
omUngenstS ..ssecvveeee 478 
sallel........ see eeeeeee 477 
1 478, 671 
DREISSENIDE ..........005, 476 
DretssenSia vee vvvccececvcaes 476 
1 477 
Drepanotrema wo... cee eeeeee 397 
DryM@us vec cccvccvcces 199, 201 
AEEENUATUS. 6. ee eee 215 
AUNYLUUS 6... cee eee 218 
bottertd oo. ce cece cece 208 
CAOSLUS Cee e even ec eeaee 206 
