238 MOLLUSCA. 
BULIMULUS. 
Bulimulus, Leach, Zoo). Miscell. i. p. 41 (1815)*; v. Martens, in Albers’s Die Helic. ed. 2, P- 209 
(1860) (ex parte)*; Die Binnenmoll. Venezuela’s, p. 21 (1878) °; Conch. Mittheil. u. 
p. 194*; Semper, Reisen in Archip. der Philippinen, Landschnecken, iii. p. 153 *, 
Bulimulus, subgen. Orthotomium, Fischer & Crosse, Miss. Scient. Mex., Mollusca, i. p. 473 (1875) 
(part.) °. 
Bulimulus, sectt. A-C, Strebel, Beitr. Mex. Land- und Siissw.-Conch. v. pp. 45, 467. 
Shell oblong, generally with straight edge to the aperture, and unicolorous, not 
shining; columella not notched at the base. Jaw composed of few plates, with vertical 
lateral edges. Teeth of the radula in straight, transverse rows, the central tooth not 
smaller than the others ; marginal teeth generally bicuspid. 
Lives by preference on the ground or on low shrubs. 
This genus is nearly allied to the preceding, and from the shell alone it is often 
impossible to decide whether a species belongs to the one or to the other. The name 
Bulimulus was first proposed for the shell of Helix exilis, Gm. (B. acutus, Leach, guade- 
lupensis, Brug.), subsequently extended by Beck (Index Moll. 1838) to include a large 
number of South-American species and a few Indian ones. The structure of the jaw 
and radula was first proposed by myself? as a generic character, with the view of 
including only American species in this genus, but, in a somewhat extended sense, 
comprising also the Otostomi. Afterwards, as the jaw and radula of a greater number of 
species became known, Bulimulus and Otostomus were distinguished as two allied, but 
distinct, genera by myself *® 4, Semper®, and, under other names as chief subgeneric 
divisions, by Fischer and Crosse °. 
This genus ranges from the southern half of North America (Kentucky—JB. deal- 
batus, Say) to the Argentine Republic (B. famatinus, Doring), but its species are not 
so numerous as those of Ofostomus. The Mexican and Central-American species 
belong to the following four groups or subgenera :— 
1. Rhabdotus, Albers (Die Helic. ed. 1), limited by v. Martens, Conch. Mittheil. ii. p. 197; type 
B. dealbatus, Say.—Shell oval or oblong, white, unicolorous, or with brown or grey streaks ; 
peristome somewhat thickened. B. schiedeanus and alternatus: Centr., N., and N.E. 
Mexico (S.W. Mexico ?). 
2. Globulinus, Fisch. & Cr.—Shell shortened oval, yellowish, nearly unicolorous. B. sufflatus : 
N.W. Mexico. 
3. Peroneus, Albers. — Shell very elongated, white, peristome simple. B. durangoanus and 
? grunert: N. Mexico; nearest allied to B. artemisie, A. Gould, from the peninsula of 
California. 
4, Leptomerus, Albers.—Shell ovate or oblong, thin, brownish, unicolorous, peristome simple. 
B. corneus, unicolor, sarcodes, coriaceus, inermis, translucens, dysoni, and ? umbraticus : 
E. & S.W. Mexico— Panama. 
The subgenera Peronwus and Leptomerus are placed by Fischer and Crosse in their 
division Goniognathmus, our genus Otostomus; but the jaw and radula of the typical 
