420 IIELIX §. 70. 



Tridopsis personuta Beck ind. p. 22. 

 Gonostoma personatum Held in Isis 1837. p. 915. 

 Ilabitat in Germania , Helvetia , lllyria, 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 callosura, margiue 

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

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

 tus. — Diam. maj. 12, min. \\ , alt. 673 mill. (CoU. Nr. 667.) 

 Helix clausa (Helicodonta) Fer. pr. 10 4. Hist. t. 51. f. 2. 



— — Lam. ed. Dh. 179. p. 114. 



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



— inflecla Say in Pliilad. journ. II. p. 153. 



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

 Triodopsis clausa Bafin. (teste Fer. ) 



Tridopsis inflecta et clausa Beck ind. p. 22. 

 Gonostoma clausum Held in Isis 1837. p. 915. 

 Habitat in America boreaii: Missouri, Carolina, Arkansas. 



01)s. Differt ab H. personata umbilico clauso, denle linguiformi inlrante, 

 nec transverso, etc. 



1091. H. convexa Rafinesque. 



T subobtecte umbilicata, globoso-depressa, diaphana, ru- 

 fescenti-cornea, pilis brevissimis obsita; spira convexiuscula ; 

 anfr. by^, supremi planiusculi, 2 ultimi convexi, ultimus antice 

 gibbus, ad aperturani constrictus; umbilicus angustus, pervius; 

 apertura late lunaris, dente lamelliformi in pariete aperturali co- 

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

 maj. 1 1 , min. 10, alt. 6 mill. (Coll. Nr. 668.) 



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



— — Fer. hist. t. 50 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. 



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



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



— — Gow/rfreport p. 174. f. 113. 



— hirsuta u Fer. prodr. 101. 

 Stenotrema convexa Bafin. ( leste Fer. ) 

 Tridopsis convexa Beck ind. p. 22. 

 Lister t. 93. f. 9 4. 



