432 CONTENTS. 



Page. 



Agriolimax campestris 489 



Pyramidula alternata . 491 



Pyramidula solitaria 492 



Pyramidula perspectiva '. 493 



Pyramidula cronkhitei anthonyi 493 



Pyramidula asteriscus 494 



Helicodiscus parallelus 495 



Punctum pygmaeum 496 



Sphyradium edentulum 496 



Philomycus carolinensis 497 



Pallifera dorsalis 498 



Pallifera hemphilli 499 



Succinea retusa 500 



Succinea ovalis 502 



Succinea avara 503 



Strobilops labyrinthica 506 



Strobilops virgo 506 



Strobilops affinis 507 



Acanthinula harpa , 508 



Pupoides marginatus 508 



Bifidaria armifera 510 



Bifidaria contracta 510 



Bifidaria corticaria 511 



Bifidaria pentodon 511 



Bifidaria tappaniana 512 



Pupilla muscorum ." 513 



Vertigo milium 515 



Vertigo ovata 516 



Vertigo morsei 516 



Vertigo ventricosa 517 



Vertigo gouldii 517 



Vertigo bollesiana 518 



Vertigo tridentata 518 



Cochlicopa lubrica 519 



Vallonia pulchella 520 



Vallonia excentrica 521 



Vallonia costata 521 



Carychium exiguum 522 



Carychium exile 523 



Unauthenticated and doubtful species 524 



Index to scientific names 525 



