418 MOLLUSCA. 
11. Ampullaria ghiesbreghti. 
Ampullaria ghiesbrechtii, Reeve, Conch. Icon. x., Ampullaria, t. 26. fig. 123 (1856) *. 
Ampullaria ghiesbreghti, Fisch. & Crosse, Miss. Scient. Mex., Mollusca, ii. p. 283, t. 48. fig. 8°; 
Pilsbry, Proc. Acad. Phil. 1892, p. 338°. 
Large, globose, chestnut-brown, unicolorous, with rather large umbilicus and red or orange peristome. 
a. Long. 85, diam. 70; apert. long. 60, diam. 43 millim. 
b. 2? 70, 99 63 > 99 52, 9 38 99 
a. Measurements of Reeve’s figure; b. Of the figure given by Fischer and Crosse. 
Hab. S.E. Mexico: Province of Chiapas (Ghiesbreght 1); San Juan Bautista in Tabasco 
(Prof. Rovirosa?); Tenosique and in the marshes of the River Usumacinta 
(Morelet 2). 
Var. miltochilus. 
Ampullaria miltocheilus, Reeve, Conch. Icon. x., Ampullaria, t. 25. fig. 120°; Fisch. & Crosse, 
loc. cit. p. 247°. 
Greenish, with numerous narrow bands, malleated; peristome bright red. 
Long. 48, diam. 43; apert. long. 35, diam. 25 millim. 
Hab. S.E. Mexico: Province of Chiapas ((hiesbreght °). 
Var. lemniscata. 
Ampullaria lemniscata, Crosse & Fisch. Journ. de Conch. xxxviii. p. 112 (1890) °; Fisch. & Crosse, 
loc. cit. p. 248, t. 44. figg. 5, 5a, b, ce" 
Pale greyish-green, with numerous narrow bands; peristome orange. Very near the preceding. 
Long. 43, diam. 39; apert. long. 33, diam. 23 millim. 
Hab. British Honpuras: Belize (Bocourt"). 
In Fischer and Crosse’s figure of A. lemniscata the umbilicus does not appear to be 
narrower than that of dA. ghiesbreghti, as stated. The aperture is comparatively of 
larger size, but this is usual in smaller specimens of the same species. 
12. Ampullaria costaricana. (Tab. XXIV. figg. 14-17.) 
+ Ampullaria reflera (Swains.), Reeve, Conch. Icon. x., Ampullaria, t. 15. fig. 69 (1856) *. 
Globose, solid, greyish-green with narrow brownish bands, or dark brown ; surface with unequal rather faint 
vertical striae; spire short, conical, with moderately deep sutures; if worn, blackish-violet ; umbilicus 
moderately large, cylindrical ; aperture with simple, sharp peristome, interior lead- coloured, distinctly 
banded, the bands prolonged into the external margin of the aperture. 
a. Long. 46, diam. 44; apert. long. 353, diam. 22 millim. 
b. 5 44, 5 405 ” 35, 4 21 ,, 
«. 39 43, ” 41 3 ” 35, ” 20 9 
ad. Pr) 40, ” 37 > 9 30, ” 19 ° 
a and 6. Specimens from Terraba; ¢. Specimen from Rio Saveyre ; d. From Palmar. ° 
tlab. Nicaragua: Lake of Nicaragua (Biolley). 
N.W. Costa Rica: Rio Saveyre, at Boca Culebra (Pittier, 1898). 
