OTOSTOMUS. 199 
Concerning the names of subgenera which have been proposed by former authors :— 
Drymeus, Albers, Die Helic. ed. 1, p- 155, “ testa rugoso-striata,” may be applied to our group a. 
In the second edition of Albers’s work it contains many other species. 
Mesembrinus, Albers, Die Helic. ed. 2, p. 214, type virgulatus, Férussac, coincides to our group k. 
Mormus, Albers, loc. cit. p. 216, type papyraceus, Mawe, can be applied to /f. 
Scutalus, Albers, contains, both in the first and second editions of Albers’s work, somewhat 
different species ; but reduced to the more characteristic species named in both editions, 
as proteus, mutabilis, and versicolor, it contains chiefly Peruvian species, and can be perhaps 
applied to our group d. 
Otostomus, s. str., and Liostracus, Albers, belong to Brazilian groups which are not represented 
within our limits. 
Thaumastus, Albers, is to be limited to Bulimus hartwegi, Pfr., from Ecuador. 
1. Otostomus dombeyanus. (Tab. XII. figg. 2, 2a.) 
Heliz dombeyana, Férussac, in Mus. Paris’; Pfr. Symb. Hist. Helic. ,ii. p. 76 (1842) (without 
description) *. 
Bulimus dombeyanus, Pfr. Symb. Hist. Helic. ii. p. 114 (1842) °, iii. p. 83 (1846) (first description 
of the shell) *; Monogr. Helic. Vivent. ii. p. 57°, vi. p. 88°; Reeve, Conch. Icon. v., 
Bulimus, t. 30. fig. 186". - 
Bulimus (Drymeus) dombeyanus, Pfr. in Malak. Blatt. ii. p. 151 (1855) °. 
Bulimulus (Otostomus) dombeyanus, v. Mart. in Albers’s Die Helic. ed. 2, p. 211°; Malak. Blitt. 
xl. p. 23 (1865) *. 
Bulimulus (Scutalus) dombeyanus, Fisch. & Crosse, Miss. Scient. Mex., Mollusca, i. p. 515". 
Lymnea rugosa, Valenc. in Humboldt & Bonpland’s Obs. Zool. ii. p. 250, t. 56. fig. 5 (young) 
(1838) ”. 
Var. alcantare : peristomate albo. 
Bulimus alcantare, Bernardi, Journ. de Conch. iv. p. 35, t. 3. fig. 1 (1853) *; Pfr. Monogr. Helic. 
Vivent. iv. p. 393 ™. 
Bulimulus dombeyanus, var. 8, Fisch. & Crosse, Miss. Scient. Mex., Mollusca, i. p. 516 a 
Bulimulus dombeyanus, Strebel, Beitr. Mex. Land- und Siissw.-Conch. v. p. 74, t. 7. figg. 3.4, 6”. 
Hab. Centra Mexico: On the slope of the hill Ajusco, near the city of Mexico 
(Hahn '%, var.). 
W. Mexico: Venta de Zopilote, State of Guerrero (H. H. Smith, only a young 
shell). 
MEXICO, asi nearer indication of locality (Bonpland !°, Cuming‘, Berendt °). 
Of three full-grown specimens before me, two exhibit the prominent edge of a former 
lip on the back of the last whorl, one-third or one-half of the circumference backwards 
from the aperture. The colour of the peristome varies in these specimens from very 
pale brown to white, which proves that 0. alcantare can scarcely be distinguished even 
as a variety; Strebel! came to the same conclusion. ‘The interior of the aperture is 
also, in the variety, brownish. ‘The young specimen from Venta de Zopilote (Tab. XII. 
figg. 2, 2a) has a pale brown band immediately below the angular periphery, as in the 
figure given by Valenciennes i 
