_ 15 — 



sub(us concolor; anfr. 7, lentissime accrescentes, vix convexius- 

 culi, uliimiis subtus convexus, ad unibilicum subexcavatus ; aper- 

 tura obliqua, iunaris; perist. simplex, acutum. 



Diam. maj. 71/2? »»'n- 6V4? Alt. 3 mill. 

 Hab. In Tennessee, Amer. sept., specimina pauca legit Rugel. 

 Obs. Zt. demiss« Binn. affinis, sed testa depressioie , umbilico 



latiore, et prsesertim absentia calli albi opaci in fundo anfrac- 



tus Ultimi distinctissima. 



Zoiütes iiiacilenta Shuül. 



Testa lata et perspective umbiiicata, depressa, arctispira, cor- 

 iico-flavescens, diaphana, superne striata, vix nitida, subtus lae- 

 viuscula, nitida, concolor 3 spira depressissime-rotundata, obtusa ; 

 anfr. 8, lentissime accrescentes, subconvexi, ultimus in fundo callo 

 albo subdentiformi profunde intrante praeditus 5 apertura lunari- 

 semicircularis ; perist. simplex, acutum. 



Diam. maj. 8, min. TVsi Alt. 3 mill. 

 Hab. In Tennessee orientali semel legit Rugel. 

 Obs. Species instructiva, forma cohortem „Patula" Held, callo 



dentiformi „Gastrodonta" Albers (Helix suppressa Say etc.), 



testae textura autcm Zonitis sectionem „Hyalina Fer." referens. 



Helix mordax Shuttl. 



Testa latc et perspective umbiiicata, depressa, sublenticularis, 

 carinata, tenuis, luteo-cornea, strigis rufis intcrruptis fasciatim 

 ornata, costis validis flexuosis remotis utrinque eximie asperata; 

 anfr. 5V2? p'ani ; apertura perobliqua angulatim lunari-ovalis ; pe- 

 rist, simplex, acutum. 



Diam. maj. 18, min. 16 j Alt. ö mill. 

 Hab. In mont. Carolina; sept. specimina ultra 13 legit Rugel. 

 Obs. H. alternataj valde affinis, sed costis validioribus, ad 1 mill. 

 inter se remotis, distincta. H. Cumberlandiana Lea ([forsan 

 mere forma monstruosa}, quäcum carina congruit, differt (ex 

 icone) testa tautum tenuiter striata nee costata. 



Helix Heldreichi Shuttl. 



Testa umbiiicata, depressa, granulato-striatula, pilis sparsis 

 rigidis asperata, cerea, fascia unica, pallide fusca ornata j anfr. 41/2? 

 planulati, ultimus antice subito deflexus ; apertura fere circularisj 

 perist. expansum, subreflexum, intus sublabiatum, continuum, nou 

 solutum. 



Diam. maj. 19, min. 15 3 Alt. 8 mill. 



Syn. Helix cydolabrisPf. Mon. Hei. 1, p.368, N0 955(;nonDesh.). 

 „ „ „ Chemn. ed. 2. tab. 79, f. 15—16. 



„ Heldreichii Shuttl. in Sehed. et Pf. Symb. 3, p. 78. 



