ORTALICHUS.—OTOSTOMUS. 191 
America; his figure, although showing distinct bands, agrees better in its more 
elongated form with the N.W. Mexican species than with the Central-American 
O. ferussaci, var. tricinctus. 
Pilsbry’s O. melanochilus, var. floridensis (Proc. Ac. Phil. 1891, p. 317, with woodcut) 
is probably a dark-mouthed variety of O. wndatus, Brug. 
Doubtful Species of Ortalichus. 
Orthalicus leucochilus, Crosse & Fisch. in Journ. de Conch. xvii. p. 423 (1859); Fisch. 
& Crosse, Miss. Scient. Mex., Mollusca, 1. p. 459, t. LS. fige. 7, 7 @; from Orizaba, 
E. Mexico, collected by Berendt, has much the appearance of an albino variety. 
Strebel does not know it. For a similar variety of O. maclure, see anted, p. 188. 
Orthalicus zebra, Mill. (ex parte), or, more precisely, O. undatus, Brug., Férussac, 
Hist. Nat. Moll. Terr. et Fluv. t. 114. figg. 5, 6; Shuttl. Notitize Malac. p. 63, 
t. 8. figg. 4,5; Binney, Terr. air-breath. Moll. N. Am. t. 54 (upper and lower 
figure); from Florida, Cuba, and Jamaica, is mentioned by Binney & Bland, Land 
and Freshw. Shells of N. Am. i. p. 218, as from Mazatlan, and at p. 219 of the 
same work, as from “Taboga, Mex.” It is therefore admitted by Fischer & 
Crosse, Miss. Scient. Mex., Mollusca, i. p. 441, among the Mexican species. As 
neither these authors, nor Strebel or myself, have found this species amongst 
the numerous Mexican specimens of the genus which we have examined, I 
presume that the locality “Mazatlan” refers to a variety of O. princeps, and 
Taboga, if meant for the island of Taboga in the Bay of Panama, to 0. ferussact. 
OTOSTOMUS. 
Otostomus, Beck, Index Moll. p. 55 (part.) (1838)'; H. & A. Adams, Gen. Moll. iu. p. 149 
(1858) *; v. Martens, Die Binnenmoll. Venezuela, p. 23 (1873) (relying on the jaw and 
radula)*; and Conch. Mittheil. ii. p. 191 (ditto) *; Semper, Reis. Archip. Philippin., Land- 
Moll. Heft 3, p. 154 (1874) °. 
Bulimulus, subgen. Goniognathmus, Fischer & Crosse, Miss. Scient. Mex., Mollusca, 1. p. 473 
1875) °. 
Fs an D-F, Strebel, Beitr. Mex. Land- und Stissw.-Conch. v. pp. 46-48 *. 
Shell oblong, generally variegated, often with expanded aperture, more or less 
shining; columella somewhat twisted, not notched at the base. Jaw composed of 
numerous plates, with very oblique edges, converging towards the median line. Teeth 
of the radula in waved transverse rows; median tooth very short, generally with a 
lateral cusp on each side; marginal teeth generally tricuspid. 
The name Otostomus was first proposed by Beck for the group of the old genus 
Bulimus which contains B. auris leporis, subsequently extended by the brothers 
