Isognostoma — Mesodon. 
3389. pustuloides Bland. V. 422. 
— Amer journ. conch. III. t. 10. 
f. 2. 3. — Georgia, Alabama. 
(Helix pustula Binn., non Fér.; 
Daedalochila pustuloides Tryon.) 
* 
3421. palliata Say. I. 316. — Chemn. 
t. 63. f. 15. 16. — Status Uniti 
orient. 
(Helix denotata Fér., notata Desh.; 
Tridopsis palliata Beck; Poly- 
gyra palliata M. E. Gray; Anchis- 
toma palliatum Ad.; Xolotrema 
palliata Tryon.) 
3492. obstricta Say. I. 317. — 
Amer. journ. conch. III. t. 9. f. 3. 
— Indiana, "Tennessee, Georgia, 
Carolina merid. 
(Helix denotata var. Fér., caroli- 
niensis Lea; Carocolla helicoides 
Lea; Anchistoma obstrictum Ad.; 
Xolotrema obstrieta Tryon.) 
34298. appressa Say. I. 317. — 
Chemn. t. 63. f. 17. 18. — Pennsyl- 
vania ad Arkansas, Georgia ad 
Illinois. 
(Helix linguifera Fér.; Tridopsis 
appressa Beck; Anchistoma ap- 
pressum Ad. Xolotrema appressa 
Tryon.) 
3494. Mullani Bland & Coop. V. 
497. — Amer. journ. conch. III. 
t. 9. f. 14. — Washington territ. 
Oregon. 
(Triodopsis Mullani Tryon.) 
Sect. 15. Mesodon. 
Mesodon Rafinesque (1819. ubi? 
citante Fér. 1819. Prodr. p. 33) 1831. 
Enum. and acc. p. 3: novum genus 
Molluscorum terrestrium. 
— Beck 1837. Ind. p. 22: sectio 
Tridopsidis. 
— H. & A. Adams 1855. Gen. II. 
p. 206: subgenus Anchistomatis. 
—  Pfr. 1855. Vers. p. 135: sectio 
Helicis. — Par. Albers 1860. Helic. 
ad. Mart. p. 98. 
— '[ryon 1867. Amer. journ. conch. 
III. p. 34: genus Mesodontinarum. 
—  Binney & Bland 1869. Amer. 
landsh. p. 134: subgenus Helicis. 
Aplodon Rafinesque 1819. Journ. 
Phys. vol. 88. p. 425; 1831. Enum. 
and acc. p. 3: genus Molluscorum 
terrestrium ? 
113 
— Cooper 1870. Amer. journ. conch. 
V. p. 213: genus. (pt.) 
Patera Albers 1850. Helic. p. 96: 
sectio Helicis. 
Ulostoma Tryon 1867. pt. 
Species. 
9359. Columbiana Lea. I. 343. — 
Chemn. t. 58. f. 10—12. — Status 
occident. (Sitka ad Californiam.) 
(Helix labiosa Gould; Anchistoma 
Columbianum Ad.; Mesodon co- 
lumbiana Tryon; Aplodon Co- 
lumbianus Coop.) 
3455. thyroidus Say. I. 345 (thy- 
roides) — Chemn. t. 58. f. 8. 9. 
— Status Uniti orientales. 
(Mesodon leucodon Raf. [teste Fér.], 
thyroides Tryon; Polygyra thy- 
roideus M. E. Gray; Anchistoma 
thyroides Ad.) 
Var. rufa Mich. (Helix rufa De Kay.) 
3356. devia Gould. I. 383. — Amer. 
Journ. eonch. Ilk £8. f 3 — 
Oregon. 
(Helix Baskervilli Pfr.; Reeve 
f. 684; Mesodon devia Tryon.) 
3367. Sayi Binn. I. 382. — Chemn. 
t. 148. f. 13. 14. — Canada ad 
Michigan et Maryland. 
(Helix diodonta Say; Anchistoma 
Sayi Ad.; Ulostoma Sayi Tryon.) 
Var.? Helix Chilhoweensis Lewis. 
3394. profunda Say. I. 382. — 
Chemn. t. 77. f. 14—16. — New- 
York ad Wisconsin, Virginia ad 
Kansas. 
(Helix Richardi Fér.; Polygyra 
profunda M. E. Gray; Anchis- 
toma profundum Ad.; Tridopsis 
profunda Mórch; Ulostoma pro- 
funda Tryon.) 
Jun. Helix bulbina Desh.? 
3425. Downieana. Bland. V. 428. 
— Amer. journ. conch. III. t. 8. 
f. 15. — Franklin County Tennessee. 
(Mesodon Downieana Tryon.) 
93433. dentifera Binn. IL. 317. V. 
429. — Amer. journ. conch. III. 
t. 7. f. 9. — Virginia, Pennsylvania, 
Maine. 
(Mesodon dentifera Tryon.) 
3434. Roemeri Pfr. III. 268 (den- 
tifera, non Binn.) — Chemn. t. 131. 
1—3. — Neu-Braunfels, Was- 
hington county Texas. 
8 
