OTOSTOMUS. 207 
either the size or the coloration of his specimens, so that we cannot refer them even by 
conjecture to any of the three forms which are indicated above. 
10. Otostomus angasi. 
Bulimus gabbi, Angas, P. Z. S. 1879, p. 477, t. 40. figg. 3 (four figures), 3 @ (living animal) *. 
a: pallide rubescens, maculis rotundis albidis, fasciis obsoletis vel nullis. (Angas, loc. cit., the first and 
second figures: var. a.) 
b: albidus, fasciis 3 fuscis alboguttatis. (Angas, loc. cit., the third figure: varr. } and c.) 
¢: unicolor, virescenti-flavescens vel albus. (Angas, loc. cit., the fourth figure and 3a.) 
Hab. N.E. Costa Rica: La Paz, on the road to the Rio Sarapiqui (Biolley). 
Centra Costa Rica: upon the flanks of Pico Blanco, at an altitude of from 3000 to 
6000 feet, on the ground (Gadd 1). 
_“ Foot broad, pointed, and very flat. Animal varies with the colour of the shell from 
white to ash-colour, greenish-white or light brown.” (Angas’s fig. 3.@, whitish.) 
This species appears to be intermediate between O. castus and O. tripictus, having 
the expanded peristome of the former, and somewhat resembling the latter in its 
painting. I have not seen a specimen of it. 
The name gabdi is preoccupied by Fischer and Crosse (1872) for a Californian species. 
11. Otostomus dunkeri. (Tab. XIII. figg. 1, 2, 2a.) 
Bulimus dunkeri, Pfr. in Philippi’s Abbild. neuer Conch. i. p. 112, t. 4. fig. 10 (1846) '; Monogr. 
Helic. Vivent. ii. p. 1017; Reeve, Conch. Icon. v., Bulimus, t. 74. fig. 533 *, 
Bulimus (Mesembrinus) dunkeri, Albers, Die Helic. ed. 1, p. 157°. 
Bulimus (Drymeus) dunkeri, Pfr. in Malak. Blatt. i. p. 151 (1855) , 
Orthalicus (Mesembrinus) dunkeri, H. & A. Adams, Gen. Moll. 1. p. 157 *, 
Bulimulus (Scutalus) dunkeri, v. Mart. in Malak. Blatt. xii. p. 36 (1865)"; Fisch. & Crosse, Miss. 
Scient. Mex., Mollusca, i. p. 511°. 
Bulimulus dunkeri, Strebel, Beitr. Mex. Land- und Siissw.-Conch. v. p. 76°. 
Hab. Centrat Mexico: State of Michoacan (Hegewisch }*, Uhde * °). 
~-W. Mexico: Tepic (Richardson). 
Var. forreri: maculis fulvo-fuscis subquadratis fasciatim dispositis vel irregularibus vario modo conjunctis 
pictus. (Figg. 2, 2 a.) 
Bulimus fenestratus (Pfr.), Philippi, Abbild. neuer Conch. iii. p. 96, t. 9. figg. 1, 5”. 
Bulimulus fenestratus, Strebel, Beitr. Mex. Land- und Siissw.-Conch. v. p. 75, t. 6. fig. 19”. 
Bulimus (Mesembrinus) fenestralis, Albers, Die Helic. ed. 1, p. 157” (misprint). 
Bulimulus forreri, Mousson, Journ. de Conch. xxxi. p. 217, t. 9. fig. 2 (1883) ™. 
Hab. N. Mexico: Chihuahua (/6ge). | 
N.W. Mexico: Ventanas, State of Durango (Forrer 13), 
Mexico: without nearer indication of locality (Philipp '°). 
(fig. 1) is easily recognizable by the pale round spots on a brownish 
The typical form 
s limited to more or less numerous patches, 
ground. In the variety the brown colour i 
