410 MOLLUSCA. 
fig. 1), is very like some specimens collected by Herr Hoge at Cordova; but as 
Swainson gives no locality, and Mousson has applied the same name to a species living 
in the Magdalena River (Malakozoologische Blatter, 1869, p. 182), and the original 
figure still more nearly resembles A. porphyrostoma, Reeve, as well as some Cuban 
specimens in the Berlin Museum, I dare not apply the name reflera, Swainson, to 
the Mexican shell, although examples of the latter sometimes have a rather broadly 
expanded peristome. A. labiosa, Fr. Koch (Philippi, loc. cit. p. 68, t. 18. fig. 5), is 
also like some of the specimens from Cordova, and it may be founded on a small 
example of A. flagellata with unusually broadly expanded peristome. 
Var. exsculpta. (Tab. XXIII. fig. 5.) 
Ampullaria flagellata (part.), Strebel, loc. cit. t. 3. fig. 14". 
Ampullaria malleata, var. 8. exsculpta, Fisch. & Crosse, loc. cit. p. 235, t. 44. figg. 6, 6a-c”. 
With very numerous and rather strong malleated impressions, without bands ; spire somewhat pointed. 
Long. 53, diam. 44; apert. long. 37, diam. 25 millim. 
Hab. E. Mexico: Vera Cruz (Strebel); Cordova (Hoge). 
Var. arata. (Tab. XXIII. figg. 7, 8, 10.) 
Ampullaria flagellata, vars. 2 & 6, Strebel, loc. cit. pp. 27, 31, t. 3. fig. 14d, and t. 3a. fig. 144". 
Ampullaria malleata, var. e. arata, Fisch. & Crosse, loc. cit. p. 235, t. 44. figg. 6d, e”. 
Distinct vertical elevated stria occupying the greater part of the surface; very few or no malleated 
impressions. 
Long. 48, diam. 38 ; apert. long. 36, diam. 22 millim. (specimen from Yucatan in the late Albers’s collection). 
Hab. E. Muxico: Vera Cruz and adjacent village of Vergara (Strebel }*); Cordova 
(Hoge). 
Yucatan (coll. Albers). 
Fischer and Crosse 517 give the localities combined for the varieties exsculpta 
and arata:— 
E. Mexico: Laguna de Los Cocos, State of Vera Cruz (Sallé). 
S.E. Mexico: Balancan, State of Tabasco, in the marshes of the river Usumacinta 
(Morelet). 
Yucatan: Palizada and San Geronimo, in marshes (Morelet). 
It seems therefore probable that specimens exhibiting these divergencies in sculpture 
may be found at different localities throughout the geographical range of the species. 
From Costa Rica I have received from P. Biolley and Van Patten several examples 
of an Ampullaria which I cannot distinguish from the var. arata, including some from 
the “‘ Laguna de Bebedero, Pacific coast,” of rather small size, from P. Biolley, as well 
as others of larger size (Tab. XXIII. fig. 10). 
The shell figured (Tab. XXIII. fig. 8) from Cordova, collected by Herr Hoge, shows 
an evident transition from the var. arata to the var. exsculpta, the upper whorls and 
