CONTENTS 
PAGE 
ne Or a A cee Meg Fame Reaak FPN a Ne ney APOE» Sem 23 
TPL) Coli Ye Ba gigoe ales: ao) oes eee ee ee mp eee ee ee 23 
Momimment. and Methods. of Work ..2i2.-iielaec «hecain cas Pe eb ess o 24 
Oar oy aie Fs tn Seas ec ee, SO oe ae ee es 25 
Chapter I. Physiography and Geology.................+-.....-- 28 
fee Mescrin tion, of thewoakes cn 8 6 ae oe eee och esis, « 28 
Hh, (CHES STAUC Eo) (ora eee eee nae, Seneca eee, en eee 32 
Chapter II. Description of the Habitats and their Molluscan Popu-  ~ 
{7 C0 ge RO Sere Cot ah ite ny Ae een a 36 
A. Detailed Discussion of Field Stations...................... 36 
1. North Shore from Brewerton east to Constantia, Sta- 
Hons. fom Vill 2.4 ee see on ees See ee es 36 
Il. South Shore, from Brewerton east to Lower South 
Dayy OtavONS LX. CO Oe eas Bon ina agus breton 60 
TS elena the: Valse os ceo oo ee sg ee oe 3 2 71 
Frenchman Island, Stations XXX to XXXII........ Tl 
hong: Island: Station Dox KX Me are ast or sfe< 2: 2 wll axe 82 
IV. The Outlet, Brewerton, Stations XXXIV to XXXVII 83 
Ves OnerdaRiverustation XX MOVIE 3 a eee sa 87 
VI. Dredgings in the Open Lake, Stations XX XIX to XLI 87 
Baranalivsis Of HnyironMents 54 8. ies ier cea as ee ae oes sos 90 
La Sood Dig oes ae ECR PEI oes a eT OT 90 
Ie Boulder-bottom yer. ccc -ee = oe ee 90) 
Tih Wiater-edoe [By pe: se sce oc Stet sce es ee 92 
III. Bulrush-Water Willow Type................. 94 
IV. Arrowhead-Pickerelweed-Cattail Type......... 95 
V. Water Lily-Burreed-Bulrush Type............ 98 
VI. Water Lily-Chara-Pondweed Type............ 98 
VilleG@atatailoiy pes 1 moe ee ee Ses aeons | oa tens 99 
VIII. Submerged Vegetation Type................- 100 
ix Deep Waherilypeen-er 4c., sense 3 -e eta cele 101 
FSR Gh er eae Ding OL es ee es ee I ee ee ee 101 
X. Deep Creek Type, Still Water................ 101 
XI. Shallow Creek Type, Moving Water, Muddy 
EMO TNY Sarna ie A 8 A ee i ae Se 102 
XII. Shallow Creek Type, Rapid Water, Stony 
PEEL Sic eS eee Oe aay ak ate 102 
XIII. Shallow Creek Type, Quiet Protected Pool..... 104 
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