TABLE OF CONTENTS. 



Page. 



Preface 437 



Introduction 439 



I. Review of Michigan conchology 439 



II. Terrestrial moUuscan fauna of Michigan 442 



III. Hints on collecting moUusca 446 



IV. Methods of killing and dissection 454 



V. Preparation of the jaw and radula 455 



VI. Classification 456 



VII. Measurement and descriptive terms 458 



Catalogue : 



Polygyra tridentata 462 



Polygyra fraudulenta 462 



Polygyra inflecta * 463 



Polygyra profunda 463 



Polygyra sayana 464 



Polygyra albolabris 464 



Polygyi'a zaleta 466 



Polygyra multilineata 466 



Polygyra palliata 467 



Polygyra elevata 468 



Polygyra pennsylvanica 468 



Polygyra thyroides 468 



Polygyra clausa 469 



Polygyra mitchelliana 469 



Polygyra ' hirsuta , 470 



Polygyra fraterna 470 



Polygyra monodon 471 



Circinaria concava 472 



Omphalina fuliginosa 474 



Omphalina inornata 475 



Vitrina limpida 476 



Vitrea cellaria 477 



Vitrea hammonis 477 



Vitrea wheatleyi 478 



Vitrea binneyana 479 



Vitrea ferrea 479 



Vitrea indentata 480 



Vitrea rhoadsi 480 



Vitrea multidentata 481 



Euconulus fulvus 482 



Euconulus chersinus polygyratus 482 



Zonitoides nitida 483 



Zonitoides arborea 484 



Zonitoides limatula 484 



Zonitoides minuscula 485 



Zonitoides exigua 485 



Zonitoides milium ' 486 



Gastrodonta intertexta 487 



Gastrodonta demissa 487 



Gastrodonta ligera 488 



Gastrodonta suppressa 488 



Agriolimax agrestis 489 



