CONTENTS - continued, 
Page 
TD) (SAM g Se esi: « 1eirer lloveraleianeraicienes sa) s( a) ele le\ cusiemeteter eh odale) cieKeheietaieteRctan sinetielic etelehetes > © 
Subcliasis) Pulnonmatasnccters ois ielolsieialelelete sie dakslenie welieicaknien el feile) wree(aris} qe . 36 
Family Veronicellidae........ or allaifel aiwisic olataitel stele nel ater teleie Sooodon ed SO 
Family, Arionidaeien ar. eisicieiel-(elcke aiodohala) alielinls etoile alehel sl avete feel) elements one) 
Bamaily, Winivaeidiae ser -erieleis relate akeliuereroreie ce He oa 64 Be0,010 Son doo a 
Ill; Presh-water Snails hic. cieveisite Son ta ceases Sood site) Stele Soo cu!) 
Subclasis) Prosobranchiata (eo . (isis iclevcieiererens wlio is lehelletefel siielohetslelal ailefe aon odo 40 
Bamily, Bithyniidaec. mista stele sens ole foo /8/lelie"fo\selie' aves vofishejelele aleltel seite Siesatatene 40 
Ramaly, PleuroOceridae ccs sie oc a iaterenel si aleiele teres [ni eiinile. e\lexe!'sl'e oitsilel eneite 42 
Bamily; De niarid dec cis. cisyeneiera sere rerstaieneyelsbouevenstatere cleteteuemennte SGyo0o006 43 
Subelasissulmonatarsceacterterc cy oie) sreteiote Sangocoade GdonaAenosDoosS 43 
Bamily, Diyamnaeid ae ye ryarethekaloienerhaensaenenens GobodgbocdCOCR +O sae50505 43 
Family, Planorbidae (7s. ciercuers:chetstonetetereneisicnekenst eke SaoonGocs Sboc6o 45 
Plate I Economically Important Land Snails .......... FOoageos do eo ada 48 
Plate Il} Economically, Important Land Smailsijacccicrenelc leo steksne steneteders Gone ol) 
Plate Ill, Testacella and Economically, Important) Shupgsis nice cietetets/enetelorens 52 
Plate IV Medically Important Presh-water Snails) 2 i. cia clelste atcrea let Soooo me 
Key for the Identification of Economically Important Snails and Slugs.... 56 
GLOSSARY) cveieeneie 0’ 0%c) ce) s/i5le/e/ vis ww cl eieie\ alelete sila pniehetarelsieverelereienenaieietek-iatel het Raion 63 
Selected References -vrcyerelercieielcdereionenene cheluiedoueioleisieketohstetehetelet -aelstenekens Hen aos OL: 
DiraGl ihe eitatiesicseliailesvese! ale ferier ell arell stele eleleyie te itelts) oietetenet metene tei tele tiesto Ee Foocoooe VY) 
Prepared in 
Plant Quarantine Division 
Agricultural Research Service 
United States Department of Agriculture 
iv 
