AMPULLARIA. 415 
the upper part near the margin. Peristome expanded in full-grown examples. Surface smooth in some 
specimens, malleated in the largest. 
a. Long. 43, diam. 38 ; apert. long. 30, diam. 21 millim. 
& ,, 65, 5, 49; 3 38, , 24 ,, 
G4 64, ,, 87; 3 44, ,, 29 ,, 
a. Deppe’s specimen; 6 and c. Specimens from Acapulco. 
Hab. W. Mexico: in a freshwater lagoon (Deppe, in Mus. Berol.); Acapulco (coll. 
Dunker). 
_ Valenciennes! gives only the vague term “New Spain” as locality. Fischer and 
Crosse? add Yucatan and Balancan in Tabasco (Morelet) and Vera Paz (Bocourt). 
The above-quoted figure is stated by them to have been drawn from Valenciennes’s 
original specimen ; it agrees very well in size and shape, and in the colour of the inside, 
with Deppe’s rather worn example in the Berlin Museum. But Fischer and Crosse 2 
give also two other figures, t. 46. fig. 8 and t. 48. fig. 6, which exhibit the general 
form of A. flagellata, and not the peculiar shape of the type of A. violacea; and as one 
of them, representing the living animal, has been drawn by Morelet himself, it is to be 
presumed that Morelet’s specimens from Yucatan and Tabasco correspond to the two 
later figures, and cannot be safely referred to the typical A. violacea. 
This species must remain somewhat doubtful until further examples are obtained ; it 
was evidently described from a worn specimen, as no Ampullaria is violet outside in a 
fresh state, but nearly all have this colour if they have lost their periostracum (so-called 
epidermis). 
Deppe’s specimen is uniformly pale violaceous, manifestly worn, and shows very 
distinctly the inside of the aperture dull brown in its greatest part, but white above. 
Dunker’s examples, one of which is here figured (Tab. XXII. fig. 3), are pale yellowish, 
somewhat greyish beneath, with narrow pale bands; apex dark violet; peristome 
broadly expanded; umbilicus cylindrical, moderately narrow: one of them is smooth, 
the other with a few malleations. 
3. Ampullaria strebeli. (Tab. XXII. fig. 2.) 
Ampullaria, sp. nov.?, Strebel, Beitr. Mex. Land- und Siussw.-Conch. i. p. 25, t. 3. fig. 18, t. 13 a. 
figg. 18.4, 5°. 
Ampullaria malleata, var. 0. strebeli, Fisch. & Crosse, Miss. Scient. Mex., Mollusca, ii. p. 235°. 
Suture much deeper than in A. malleata, the spire more pointed and conical, the lower part of the last whorl 
more narrowed ; surface with vertical stria# of unequal strength and scattered irregular spiral angular 
lines, without malleated impressions, shining dark brown, with distinct spiral bands, which are sometimes 
obsolete, sutural region paler; interior of the aperture very dark brown; peristome whitish, thin, not 
expanded. _ ; 
a. Long. 52, diam. 42; apert. long. 34, diam, 23 millim. 
b. ” 433, 3 (ON ” 28, » 19 , 
c. ” 43, ” 36 ; ” 29, ” 19 ” 
Hab. E. Mexico: Misantla, in a small stream called the “ Brazo seco” (Strebel ! 2); 
Huatusco (Dr. Hille, in coll. Dunker). 
