20 HELICIDiE. 



Obs. Z. demissa, Bimi. affinis, seel testa depressiore, 

 umbilico latiore, et prsesertim absentia call: albi opaci in 

 fundo anfractus iiltimi distiuctissima. 



ZONITES MACILENTA, Shuttlewoeth, 



Testa late et perspective unibilicata, deprcssa, arctispira, eor- 

 neo-flavescens, diaphana, supernfe striata vix nitida, subtus las- 

 viuscida, nitida, concolor ; spira deprcssissime rotundata, obtusa ; 

 aufr. 8 lentissLnie accrescentes, subconvexi, ultimus in fundo callo 

 albo subdentiformi profunde intrante praeditus ; apertura lunari- 

 semicircularis ; perist. simplex, acutum. 



Dluvi. maj. 8, min. 7^ ; alt. 3 miE. 



Hob. in Tennessee orientali, semel legit Rugel. 



Ohs. Species instructiva, forma cobortem " Patula " 

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

 pi'essa, Say, etc.) testiB textura autem Zonitis sectionem 

 " Hyalina Per." referens. 



HELIX UVULIFERA, ShUTTLEWORTH. 



Testa rimato-perforata, superne plauiuscula, subtus inflata, 

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

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

 scrobieulato-constrictus ; apertura valde obliqua, auritbrmis, rin- 

 gens, Tald6 coarctata ; perist. acutum, reflexo-jiatulum, marginibus 

 plica linguiformi oblonga medio escavata profundi intrante junc- 

 tis, dextro lamella profundi immersa in apicula filifonni reflcxa 

 dcsinente, basali tiiberculo dentiformi obliquo et sinuoso instructa 



