Strobila — Trigonostoma. 
— Crosse & Fischer 1872. Moll. terr. 
Mex. p. 225: sectio Helicis. 
Species. 
1690. Strebeli Pfr. V. 222. — Ma- 
lak. Bl. 1861. t. 1. f. 5—8. — 
Veraeruz reipubl. mexican. 
3360. labyrintica Say. I. 416. — 
Chemn. t. 66. f. 17—20. — Pean- 
sylvania, Massachusetts, Missouri, 
Texas. 
(Anchistoma labyrinthicum  Ad.; 
Hyalina labyrinthica Alb.; Stro- 
bila labyrinthiea Morse.) 
3393. Hubbardi Brown. V. 422. 
— Amer. journ. conch. II. t. 4. 
f. 45. — Indianola, Texas. 
(Strobila Hubbardi Tryon.) 
3037. Vendryesiana Gloyne. VII. 
433. — Journ. Conch. 18723. t. 2. 
f. 7. — St. Andreas Jamicae. 
An — H. Hubbardi? teste Bland. 
Sect. 8. Gonostoma. 
Gonostoma Held 1837. Isis p. 915: 
novum genus Helicum (H. obvoluta.) 
— Albers 1850. Helic. p. 94; 1854. 
Malac. Mader. p. 43; 1860. Helic. 
ed. Mart. p. 91: sectio Helicis. 
(emend.) — Par. 1855. Vers. p. 126. 
— De Paiva 1867. Moll. Mader. 
p. 96. — Mouss. 1872. Rev. Canar. 
p. 62. 
— Moórceh 1865. Journ. Conch. XIII. 
p. 387: genus Odontognathorum. 
— Kreglinger 1870. Verzeichn. p. 62: 
subgenus Helicis. 
Tridopsis ,Rafin.« Mórch. 1852. 
Catal. Yoldi p. 6: genus Helici- 
darum. (pt.) f 
Anchistoma Kobelt 1871. Catal. 
p. 8: sectio Helicis. 
Subsect. 1. Drepanostoma. 
Drepanostoma Porro 1836 in Guérin 
Mag. et in Malac terr. e fluv. della 
prov. Comasea p. 23: novum genus 
ab Helice separatum. 
— Anton 1839. Verz. p. 39: subgenus 
Helicis. 
— Villa 1841. Disp. syst. p. 19: genus 
Conchyliorum terrestrium. 
— Albers 1850. Helic. p. 93: sectio 
Helicis. — Par. Pfr. 1855. Vers. 
p. 136. — Stabile Moll. 
Piém. p. 38. 
1864. 
105 
— Móreh 1852. Catal. Yoldi p. 6: 
sectio "Tridopsidis. 
— H. & A. Adams 1855. Gen. II. 
p. 207: subgenus Anchistomatis. 
— Albers 1860. Helie, ed. Mart. 
p. 92: subsectio Gonostomatis. 
— Kobelt 1871. Catal. p. 9: subsectio 
Anchistomatis. 
Contorta Mühlf: test. Villa. 
Species. 
3179. nautiliformis Porro I. 390. 
— Chemn. t. 90. f. 4—9. — Lom- 
bardia. 
(Drepanostoma nautiliforme Porro; 
Chloritis drepanostoma Beck ; 
Anchistoma nautiliforme Ad.) 
Subsect. 2. Trigonostoma. 
Trigonostoma Fitzinger 1833. Syst. 
Verz. p. 97: novum genus Helicoi- 
deorum. (H. obvoluta.) 
— Strobel 1850. Malac Ungh. p. 11: 
sectio Helicis. — Par. Moquin- 
Tandon 1855. Moll. France p. 144. 
— Stabile 1864, Moll. Piém. p. 36. 
— Albers 1860. Helic. ed. Mart. 
p. 92: subsectio Gonostomatis. 
Helicodonta Risso 1826. Hist. IV. 
p. 65: genus Helicidarum. (obvoluta.) 
Vortex Beck 1837. Ind. p. 29: sub- 
genus Helicis. 
— Moóreh 1852. Catal. Yoldi p. 6: 
sectio "Tridopsidis. 
Euphemia Leach teste Beck 1846. 
Amtl. Ber. v. Kiel p. 122: subgenus 
Helicis. 
Species. 
3347. angigyra Ziegl. I. 414. — 
Chemn. t. 64. f. 16—18. — Italia 
borealis, Tirolia meridion. 
(Helix Stentzii Partsch; Vortex 
angigyra Beck; Gonostoma angi- 
gyrum Held; Trigonostoma an- 
gigyrum Hartm.; Anchistoma 
angigyra Ad.) 
3395. obvoluta Müll. I. 413. — 
Chemn. t. 64. f. 13—15. — Europae 
terrrae pleraeque. 
(Helix trigonophora Lam., bila- 
biata OL, holosericea Gmel.; 
Helicodonta obvoluta Risso; Tri- 
gonostoma X obvolutum Fitz.; 
Vortex obvoluta Beck; Gono- 
stoma obvolutum Held; Polygyra 
