STREPTOSTYLA. 85 
The Mexican and Central-American species may be arranged as follows :— 
A. Sculptee (Streptostyla, s. str., Albers): sculptured .  nicoleti, botteriana, dubia. 
B. Polite (Chersomitra, v. Mart.) : polished. 
a. Nigricantes: with black bands . . . . . . ~~ nigricans, mitreformis. 
b. Oliveeformes: oblong-ovate, obtuse at both ends. delattrei, irrigua, shuttleworthi, 
cylindracea. 
c. Coniformes: oblong-ovate, attenuated below . . coniformis, conulus. 
d. Turgidee: ovate, swollen in the middle . . . .  obesa, turgidula, labida, lurida. 
e. Physeformes: subovate, with longer tapering  delibuta, ventricosula, thomsoni, 
spire. viridula, plicatula, biconica, flavescens, fulvida, 
glandiformis, physodes, limneiformis, oblonga. 
jf. Aplectzformes: subcylindrical, with rather long — sololensis, meridana, dysoni, vex- 
spire ; size small. ans, boyeriana. 
g. Subturritz : still more elongate; sizesmall . .  sargi, mohriana. 
C. Ligulate (Petenia, Cr. & Fisch.): a mucous-pore at  Jigulata, ? catenata. 
the foot. 
A. Sculpte. 
[Streptostyla, sensu stricto, v. Martens, in Albers’s Die Helic. ed. 2, p. 33 (1860). ] 
1. Streptostyla nicoleti. 
Spiraxis (Streptostyla) nicoleti, Shuttl. in Bern Mittheil. 1852, p. 204 (Diagn. no. 2, p. 24)’; 
Notitize Malac. 11. p. 14, t. 5. fig. 1 (1877) °. 
Spiraxis nicoleti, Pfr. Monogr. Helic. Vivent. iii. p. 477 *. 
Achatina nicoleti (Shuttl.), Pfr. in Martini & Chemnitz, Syst. Conch.-Cab. ed. 2, Achatina, no. 47, 
p. 325, t. 26. fige. 18, 19%, 
Streptostyla nicoleti (Shuttl.), Fischer & Crosse, Miss. Scient. Mex., Mollusca, i. p. 23°; Strebel, 
Beitr. Mex. Land- und Siissw.-Conch. iii. pp. 6, 12-14, t. 7. figg. 2, 2a-/f, p. 49, t. 22. 
figg. 3, 3 a—d (living animal), t. 3 (anatomy), t. 6. fig. 1 (radula) °. 
Hab. F. Mexico: Misantla, San Isidro, and San Juan Miahuatlan, woody hills, on 
decayed trunks of trees, solitary (Strebel®); Misantla and Coatepec (Hdége) ; 
Jalapa (MM. Trujillo); Cordova (Jacot-Guillarmod }~*). 
Var. subovata. 
Streptostyla nicoleti, Fischer & Crosse, loc. cit. t. 1. figg. 2, 2a’. 
Streptostyla nicoleti, Form B, Strebel, loc. cit. p. 14, t. 7. fig. 3°. 
Hab. ¥. Mexico: Toxpam, near Cordova (Sallé5) ; Orizaba (Botteri 8). 
2. Streptostyla botteriana. 
Streptostyla botteriana, Crosse & Fischer, in Journ. de Conch. xvii. p. 190 (1869) *; Fischer & 
Crosse, Miss. Scient. Mex., Mollusca, i. p. 25, t. 2. figg. 4, 4a, 6°. 
Hab. E. Mexico: Orizaba (Botteri |), 
