OTOSTOMUS. 233 
Drymeus mexicanus (Lamarck), Tryon, Am. Journ. Conch. iii. p. 168, t. 9 (18). fig. 5 (copy from. 
Reeve) (1867) ?. . 
Bulimulus (Thaumastus) tryoni, Fisch. & Crosse, Miss. Scient. Mex., Mollusca, i. p. 565°. 
Hab. N.W. Mexico: Sinaloa (Tryon 2). Sa 
MExico, without nearer indication of locality (Leeve +). 
Var. pochutlensis: fasciis nigro-fuscis, albido et pallide fulvo circumdatis. 
Bulimulus tryoni, var. B. pochutlensis, Fisch. & Crosse, loc. cit. p. 565, t. 24. figg. 3,3a*. 
Hab. W. Mexico: Pochutla, near Chilapa, in the State of Guerrero (Sallé 4). 
| This species is somewhat doubtful. Tryon describes 2 its colours as “‘ white, with two 
brown zones on the last whorl and maculations of the same colour on the others” ; 
this would agree with 0. palpaloensis, Strebel, but his figure shows three continuous 
narrow bands on the last and one on the preceding whorl. Fischer and Crosse ? 
quote Reeve’s fig. 244, and also the var. 6 of O. mewxicanus of Pfeiffer and myself 
(=palpaloensis); they add the variety pochutlensis, which differs in the proportions and 
_ colours of the shell, and bears some resemblance to O. uhdeanus. As I have not seen 
an authentic specimen of O. tryoni, I cannot make out more clearly the difference or 
identity of the said species. For Bulimus meaxicanus of Lamarck, see page 251. 
45. Otostomus tropicalis. 
Bulimus tropicalis, Morelet, Test. Noviss. i. p. 9 (1849)*; Pfr. in Martini & Chemnitz, Syst. 
Conch.-Cab. ed. 2, Bulimus, p. 198, t. 55. figg. 5, 6°; Monogr. Helic. Vivent. iii. p. 424°. 
Bulimus (Pyrgus) tropicalis, Pfr. in Malak. Blatt. ii. p. 159 (1855) °. 
Bulimulus (Liostracus) tropicalis, Fisch, & Crosse, Miss. Scient. Mex., Mollusca, i. p. 504, t. 20. 
fige. 7, 8°. 
Bulimulus tropicalis, Strebel, Beitr. Mex. Land- und Siissw.-Conch. v. p. 95°; Pilsbry, Proc. Acad. 
Phil. 1891, p. 315". 
Hab. Yucatan: Campeche, on the shore (Morelet'); Tabi, S. of Merida, in the 
interior (F. D. Godman, Febr. 1888); Ruins of Labna (Pilsbry ). 
Strebel ¢ suggests that this may be only a sinistral variety of O. honduranus or of an 
allied species ; O. honduranus, however, is distinctly more ventricose. I have seen six 
specimens from Yucatan, all sinistral, agreeing with the description of O. ¢ropicalis in 
all other respects. In all there are to be seen three brown spiral bands, exclusive of 
the brown coloration of the umbilicus ; the uppermost bands are ordinarily more 
narrow than the third, and rather pale reddish. 
46. Otostomus uhdeanus. (Tab. XV. figg. 1-6.) 
Bulimulus (Mesembrinus) whdeanus, v. Mart. in Monatsber. Akad. Wiss. Berl. 1868, p-. 541°; 
Malak. Blatt. xii. p. 25, t. 1. figg. 4, 5 (1865) °; Pfr. Monogr. Helic. Vivent. vi. p. 114°. 
Bulimulus (Scutalus) uhdeanus, Fisch. & Crosse, Miss. Scient. Mex., Mollusca, i. p. 530, t. 21, 
figg. 4, 4a". . 
Bulimulus uhdeanus, Strebel, Beitr. Mex. Land- und Siissw.-Conch. v. p. 90, t. 11. figg. lla, 0°. 
BIOL. CENTR.-AMER., Terr. and Fluviat. Mollusca, September 1893. 30 
