420 
HELIX §. 79. 
Tridopsis personata Beck iad. p. 22. 
Go7iosloma perso7iatum Held in Isis 1837. p. 915. 
Habitat in Germania, Helvetia, Illyria, 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. rellexum, intus callosum, margine 
dextro dente majore, intrante, basali dente minore marginali mu- 
nito; paries aperturalis dente tertio, linguiformi, intrante praedi- 
tus. — Diam. maj. 12, min. I I , all. Oys mill. (Coli. Nr. 667.) 
ffelix clausa (Helicodonta) Ber. pr. 104. Hist. t. 51. f. 2. 
— — Lam. ed. Dli. 179. p. M i. 
— “ Chernn. ed. II. Helix N. 381. t. 64. f. 25. 26. 
— inflccia Say in Pliilad. journ. II. p. 153. 
— — Bimi, in Bost. journ. III. p. 358. t. 9. f. 1. 
Triodopsis clausa liafin, (teste Fer.) 
TiHdopsis inflecta ct clausa Beck ind. p. 22. 
Gonostoina clausum Held in Isis 1837. p. 915. 
Habitat in America boreali: Missouri, Carolina, Arkansas. 
01)8. Differt ab II. personata umbilico clauso, dente linguiformi intrante, 
noc transverso, etc. 
1091. H. convcKa Rafinesque. 
T subobtecte umbilicata, globoso - depressa , diapbana, ru- 
fescenti -cornea, pilis brevissimis obsita; spira convexiuscula ; 
anfr. Sya, supremi planiusculi, 2 ultimi convexi, ultimus antice 
gi.bbus, ad aperturam constrictus; umbilicus angustus, pervius; 
apertura late lunaris, dente lamelliformi in pariete aperturali co- 
arctata; perist. acutum, relloxuin, intus albo -callosum. — Diam, 
maj. 11, min. 10, ait. 6 mill. (CoII. Nr. 668.) 
Helix convexa Desh. in Encycl. medi. II. N. M8. p. 253. 
— ~ Fer. hist. t. 50 A. f. 2. 
— — Lam. cd. Dh. 176. p. H2. 
— — Chernn. ed. n. Helix N. 57. t. 10. f. 17. 18. t. 66. 
f. 24 — 27. 
— monodon Rack. in Linn. tr. XIII. p. 42. t. 8. f. 2. 
— — Binn. in Bost. journ. IU. p. 360. t. 10. f. 1. 
— — Gow/rf report p. 174. f. 113. 
— hirsuta a Fer. prodr. 101. 
Stenotrema convexa Rafm. (teste Fer.) 
Tridopsis convexa Beck ind. p. 22. 
Lister t. 93. f. 94. 
