20 



Obs. Z. demissa, Binn. affinis, sed testa depressiore, 

 umbilico latiore, et prsesertim absentia calli albi opaci in 

 fundo anfractus ultimi distinctissima. 



ZONITES MACILENTA, SnuTTLEWORTH, 



Testa late et perspective umbilicata, depressa, arctispira, cor- 

 neo-flavescens, dlaplmna, superne striata vix nitida, subtus Ix- 

 viuscula, nitida, concolor ; spira depressissime rotundata, obtusa ; 

 anfr. 8 lentissime accrescentes, subconvexi, ultiinus in fundo eallo 

 albo subdentiformi profunde intrante praeditus ; apertura lunari- 

 semicircularis ; perist. simplex, acutum. 



DIAM. niaj. 8, min. 7 ; alt. 3 mill. 



Hob. in Tennessee oriental!, semel legit Rugel. 



06s. Species instructiva, forma cohortem " Patula " 

 Held, callo dentiformi " Gastrodonta " Albers (H. sup- 

 pressa, Say, etc.) testae textura autern Zonitis sectioneni 

 " Hyalina Fer." referens. 



HELIX UVULIFERA, SHUTTLEWOETH. 



Testa rimato-perforata, superne planiusoula, subtus iuflata, 

 striata, cinereo-albida, solidula, nitidula ; anfr. 5, lente accrescen- 

 tes, angusti, ultimus ad aperturam subito deflexus, subtus devius, 

 scrobiculato-constrictus ; apertura valde obliqua, auriformis, rin- 

 gens, valde coarctata ; perist. acutum, reflexo-patulum, marginibus 

 plica linguiformi oblonga medio excavata profunde intrante junc- 

 tis, dcxtro lamella profunde iinniersa in apicula filiform! reflexa 

 desinente, basali tuberculo dentiformi obliquo et sinuoso instructo. 



