CONTENTS. 
PAGE 
Lt OBIE RVOL Oo es gre aR ay PL RA eR Pee ee oe 2 441 
Mer OeOte SEU Veneta ten Cen aeheh e cae a. Le ecanti el and eeeenuctee 5 ee eat ae x ie Si goa 441 
PNG SIO WAL CG Cid CRIES ie sane Sen ye SAPP UN cece SE PPG AVON cree peace Scie 442 
PAR OGOMICKO OUSIGETALIONS thayhat. a> cviss cts oS 52 dal ttaee es. 0 5 do Meta want aeae a 442 
HE Ra OG Miser at te ere ike As nats oa) tac hie Amaia ae Wa) s: Faeroe ee SEER eS 443 
Me MNS STG LGV SUNNY I cS! CURA ie eR en en er ae MORE et ea PRO Pe 446 
Baetlbeslatermediateimdaevor Said! Spits: conc hoe ass Ssuitseis.: @ ci 446 
C. The East Branch of the North Branch of the Chicago River.......... 447 
Dre ralnerGLetiwiOOd. CACHE RIG RE. a,ab o.: cce-cusregergad © f Sadho! 2c ito) otha Ne, aati wien setae 447 
Beane Norio. branch of the Chicago River! peso ccceintp oe ac aes os 448 
SAS OMe COMMU SOs yan. pee tele ces een nce cee tyson balesaecwalere ser el tieccrees. caeretete cS’ toon 449 
DetavedmMiscussion and Comparison Of Stations .: 0: 82.226. .0- 3502 Jee eed. 449 
Mam oxOkdes Marsh otationsel “amelie... sn, ccc serk ccm custers are: shevsws atnicuoeses 449 
1, Ale Ibaermanechignts Iatckee,  Swannkorts INI) KOK Gaancaaoashanaoouue 452 
C. The East Branch of the Chicago River. Stations XXI to XXIX..... 472 
Pre Glenwood beach Ridge. “Stations X2UX to XOCKIV wy... sac ag os 479 
E. North Branch of the Chicago River. Stations XXXV and XXXVI. .484 
SEEARARE ITs & iat Aol alle MP ec oiler Ste oy Hie Ss a a 484 
ple eroimshernestinaltopeClesurae sayin cele ca nora cares Mirae ee Ces na ON 487 
paolesoimLhuvaratiless peClesa: wee m ces ex itecke. tows ckteoca nee) se, cece poe @avsed Ske 488 
NDB GLAU OHEAY 5 0 Gig Se hy a ences RIPEN ACE, tae > ONG cat Oe Er ue aA one Ree Rie rete ya Sore eee Same 489 
mHsbematieCataionue of the Mollusca: :s 2024.6. vee tt de cree et kee vee 491 
