420 HELIX §. 79. 



Tridopsis persomta Beck ind, p. 22. 

 Gonostoma personatum Held in Isis 1837. p. 915. 

 Habitat in Germania , Helvetia , lUyria, Gallia , Italia. 



1090. H. clausa Rafinesque. 



T. obtecte perforata, orbiculato-convexa, granulato-striata, 

 pubescens, griseo-fusca; spira brevis; anfr. 5 vix convexiusculi, 

 ultimus ad aperturam superne gibbus, lateraliter constrictus; 

 apertura coarctata; perist. reflexum, intus callosum, margine 

 dextro dente majore, intrante, basali dente minore marginali mu- 

 nito ; paries aperturalis dente tertio , linguiformi , inlrante praedi - 

 tus. — Diam. maj. 12, min. 11 , alt. eys mill. (Coll. Nr. 667.) 

 Helix clausa (Helicodonta) Fer. pr. 104. Hist. t. 51. f. 2. 



— — Lam. ed. Dh. 179. p. 114. 



— — Chemn. ed. II. Helix N. 381. t. 64. f. 25. 26. 



— inflecla Say in Philad. journ. U. p. 153. 



— — Bimi. in Bost. journ. IH. p. 358. t. 9. f. 1. 

 Triodopsis clausa Bafiti. (tesle Fer. ) 



Tridopsis inflecta et clausa Beck ind. p. 22. 

 Gonostoma clausum Held in Isis 1837. p. 915. 

 Habitat in America boreali: Missouri, Carolina, Arkansas. 



Obs. Differt ab H. personala umbilico clauso, denle linguiformi inlrante, 

 nec Iransverso , etc. 



1091. H. eonvexa ^aSxkBst^J-^f^^/.^Jy^.tr/xjOsrp^p 



loyi. H. eonvexa Kaiinesque/ Y/^. ^-p/?. f.y^O^/,--;^;? 



T subobtecte umbilicata, globoso-depressa,' diaphari'a," rii-^ 

 fescenti-cornea, pilis brevissimis obsita; spira convexiuscula ; 

 anfr. 5^2, supremi planiusculi, 2 uitimi convexi, ultimus antice 

 gibbus, ad aperturam constrictus; umbilicus angustus, pervius; 

 apertura late lunaris, dente lamelliformi in pariete aperturali co- 

 arctata; perist. acutum, reflexum, intus albo-callosum. — Diam. 

 maj. 11, min. 10, alt. 6 mill. (GoII. Nr. 668.) 



Helix convexa Desh. in Encycl. meth. II. N. 118. p. 253. 



— — Fer. hist. t. &'o A. f. 2. 



— — Lam. ed. Dh. 176. p. 112. 



— — Chemn. ed. II. Helix N. 57. t. 10. f. 17. 18. t. 66. 



f. 24 — 27. 



— nionodotl Back. in Linn. tr. XIII. p. 42. t. 8. f. 2. 



— — Binn. in Bost. journ. IIL p. 360. t. 10. f. 1. 



— — Goicld repovt p. 174. f. 113. 



— hirsuta a Fer. prodr. 101. 

 Stenotrema convexa Bafin. ( teste Fer. ) 

 Tridopsis convexa Beck ind. p. 22. 

 Lister t. 93. f. 94. 



