AMPULLARIA. 409 
Ampullaria malleata (J onas), v. Mart. in Malak. Blatt. iv. p. 189 (1858) °; Fisch. & Crosse, loc. cit. 
p. 334 (part.), t. 46. fig. 2°. 
Ampullaria reflexa (Swains.), varr., Philippi, in Martini & Chemnitz, Syst. Conch.-Cab. ed. 2, 
Ampullaria, pp. 35, 58, t. 9. fig. 6, and t. 18. fig. (without number, the middle one in the 
lower row, the latter copied from J onas)*. 
Ampullaria flatilis, Reeve, Conch. Icon. x. , Ampullaria, t. 7. fig. 31”. 
Ampullaria violacea (Val.), v. Mart. in Malak. Blatt. xii. p. 52 (1865) *’. 
A very variable shell, chiefly distinguished by its ovate form, with rather obtuse spire and superficial suture, 
the smooth and somewhat shining surface, with more or less numerous malleated impressions, and the 
somewhat enlarged and expanded peristome, this being especially noticeable in the lower half of its outer 
side. It is generally of a yellowish-green (olivaceous) colour, more or less pale, somewhat darker in the 
lower half of the shell; worn specimens become violet, as in most species of this genus, and in fresh 
shells the upper whorls, having been exposed for a longer time to chemically destroying agencies, are 
often of a violet colour, the uppermost summit generally being blackish; the interior of the aperture is 
usually of a dark purple-brown, the peristome pale yellowish. The size is very variable, as in many 
species of freshwater shells. A distinctly expanded peristome does not always denote that the shell is 
full-grown, for specimens occur in which the remnant of an expanded peristome is to be seen about a 
half-whorl backwards of the aperture, as in the figure given by Jonas and in fig. 15 of Strebel. 
a. Long. 634, diam. 56; apert. long. 44, diam. 28 millim. 
b ” 60, ,, 48; ” 40, ,, 26 9 
¢. » 68, ,, 534; 9 44, ,, 32 
d. ” ol, ” 474; ” 4], ” 30 ” 
é. 39 53, ” 47; 39 38, 9 26 9 
i. 39 43, ” 383 5 ” 323, 39 24 9 
g ” 43, 29 36; ” 29, 29 22 ”? 
a. Dimensions of Strebel’s specimen fig. 14, from Vera Cruz; 6. Measurements of Jay’s figure; c-g. Specimens 
from Cordova, collected by Hoge. 
Hab, E. Mexico: Vera Cruz!?711 (Haines, in coll. Dunker ; Hoge; H. H. Smith) ; 
immediate environs of the town Vera Cruz, in the so-called Rio Tenoya, and in 
ditches which communicate with it (Strebel ®); Cordova (Hége). 
S.E. Mexico: Tabasco 12; Balancan, State of Tabasco, in marshes (Morelet); Teapa, 
State of Tabasco (H. H. Smith). 
Very young specimens of this species are figured on Tab. XXIII. figg. 4 a, 3. 
I restrict the name flagellata to the specimens from Eastern Mexico and to those 
essentially similar to them, a fine series of which has been collected by Herr Hoge at 
Cordova; the dimensions given above under c-g are all taken from specimens with an 
expanded peristome, and therefore probably full-grown. 
As regards the synonymy of this species, I may refer to the observations of Strebel ®, 
Fischer and Crosse, and Pilsbry’. Say does not mention the malleated impressions, 
but his name “ flagellata” (lashed, scourged) can hardly be understood otherwise than 
as an allusion to them; the locality given by him! “near Vera Cruz” coincides well 
ith the statements of subsequent writers, and, moreover, Pilsbry, having examined the 
type-specimens, asserts the identity of A. frageliata and A. malleata. With regard to 
A. reflexa, Swainson (1823), the original figure of it, copied by Philippi (oc. cit. t. 3. 
BIOL. CENTR.-AMER., Terr. and Fluviat. Mollusca, August 1899. 52 
