STROBILA. . 173 
upper wall of the aperture. Jaw ribbed. Radula like that of Helix: lateral teeth 
bicuspid ; marginals low, broad, serrated. 
CoMPARATIVE TABLE OF THE SPECIES OF STROBILA. 
Nomen. Figura. Sculptura. | Umbilicus. | Apertura. | Coolratio. Diam. Alt. | Anfr. Patria. 
| 
oo mm. | mm. 
labyrinthica, Say... convexe supra oblique! angustus. reflexa, plica | fulva. 2-3 14-2] d-6 | N. America, 
conica, sub-| costulata, parietali | E. Mexico. 
angulata. infra levi- distincta. | 
gata. | 
_ | 
salvini, Tristr. ......, trochiformis, ” latus. » om 3 2b 53 | N. Guatemala. 
| distincte | | 
angulata. | | | 
| 
1. Strobila labyrinthica. 
Heliz labyrinthica, Say, Journ. Acad. Phil. i. p. 124 (1817) *, and in Nicholson’s Encyel. ed. 3, iv. 
p- 7 (1819)*; Férussac, Prodr. p. 34. no. 111 (1821) *, and Hist. Nat. Moll. terr. t. 51 8. 
fig. 1°; Binney, Bost. Journ. Nat. Hist. iii. p. 393, t. 26. fig. 1 (1837)°; A. Gould, Report 
Invert. Mass. p. 184, fig. 106 (1841) °, and ed. 2, p. 415, fig. 626"; Pfr. Symb. Helic. ii. 
p- 31°; Monogr. Helic. Vivent. i. p. 416°; in Martini & Chemnitz, Syst. Conch.-Cab. 
ed. 2, Helix, i. p. 382. no. 397, t. 66. figg. 17-20 *°; Reeve, Conch. Icon. vii., Helix, t. 122. 
fig. 728"; Binney, Terr. air-breath. Moll. of N. Am. ii. p. 202, t. 17. fig. 3”, and iv. p. 95 *; 
Whiteaves, Canad. Nat. 1863, p. 24"; Morse, Am. Nat. i. p. 545, figg. 41, 42”; Binney 
& Bland, Land and Fresh-water Shells of N. Am. i. pp. 84, 85, figg. 150-154 (with jaw and 
radula) °°. 
Strobila labyrinthica (Say), Morse, Journ. Portland Soc. i. p. 26, figg. 64-67 (1864) ; Tryon, 
Am. Journ. Conch. ii. p. 259, t. 19 (4). fig. 44°; Binney, Terr. air-breath. Moll. of N. Am. 
v. (Bull. Mus. Comp. Zodél. Harv. Coll. iv.) pp. 258-260, figg. 149-152"; Manual of Am. 
Land-Shells (Bull. U. S. Nat. Mus. no. 28), pp. 263-265, figg. 279-283”; Strebel, Beitr. 
Mex. Land- und Siissw.-Conch. iv. p. 48, t. 4. figg. 6, 6 a, 5, t. 11. fig. 2 (radula) *. 
Helix strebeli, Pfr. in Malak. Blatt. viii. p. 71, t. 1. figg. 5-8 (1861) *; Monogr. Helic. Vivent. v. 
p. 222”. 
Helix (Strobila) strebeli (Pfr.), Fisch. & Crosse, Miss. Scient. Mex., Mollusca, i. p. 267, t. 12. 
fige. 7,7 a, 6”. 
Hab. Nort America: Lower Canada, Island of Orleans, Montmorenci Falls1*; United 
States, from Maine 1618, Massachusetts 91016, and Wisconsin !¢ to Mississippi 7 8 
and Texas 9 1018, usually in the fissures of decaying wood or in heaps of decaying 
leaves. 
KE. Mexico: Mirador, in the State of Vera Cruz (Berendt & Strebel ?1—**) ; environs 
of Vera Cruz (Strebel 2). 
Variable in the elevation of the spire and in the number of the ribs. Strebel 
