AMPULLARIA., 405 
pp. 187-200); these groups, however, are connected by intermediate forms, and several 
of them are confined to the more southern parts of America. In Mexico and Central 
America four groups are represented, in addition to the subgenus Ceratodes; they are 
as follows :— 
I. Casstpirormes. Shell ovate, whorls equally rounded, with flat (superficial) sutures. Interior 
of the aperture often deeply coloured. 
II. Doutrrormzs. Shell globose, last whorl very swollen, sutures deeper. 
III. Hexrcirormes. Shell smaller, depressed-globose, with elevated spire and moderate umbilicus. 
IV. Paruta. Shell smaller, more or less ovate, more enlarged beneath; sutures rather deep ; 
umbilicus narrow or closed. 
I. IT. II. IV. 
E. Mexico ...... flagellata, with vars. exsculpta, 
arata, and melanostoma ;_ stre- 
: beli, with var. prasina. 
S.E. Mexico...... flagellata, with vars. exsculpta, | ghiesbreghti, with var. milto-| cerasum. 
arata, chiapasensis,andmalleata.| chalus. 
S. Centr. Mexico. .| flagellata, var. oajacensis, innexa. 
W. Mexico ...... violacea. 
S.W. Mexico ....| ewmicra, innewa. 
S. Mexico ...... monachus. ssn ee ee ee erogata. 
Yucatan ........ flagellata, var. arata. ghiesbreghti, var., yucatan- 
ensis. 
British Honduras | isis we ee belizensis, ghiesbreghti, var. 
lemniscata. 
|N. Guatemala ..| flagellata, vars. gigantea, tris- | delattret. erogata. 
tran, and guatemalensis. 
W. Guatemala ..|flagellata, var. guatemalensis, 
occlusa. 
E.Guatemala....) ne eee ee delattrei, yucatanensis, var. 
yzabalensis. 
Honduras ...... auriformis, dyson. ? hondurasensis. 
Niearacua. .:..-+| ce eee costaricana, hondurasensis. ; 
Costa Rica ...... flagellata, var. arata. costaricand. wees conordea. 
N. Panama......| ee wee ee costaricana. Lee pealeana, 
cumingr. 
S.Panama ......| cee eee tee ee wae cuming?. 
AMPULLARIA, sensu strictiore. 
I. CASSIDIFORMES. 
1. Ampullaria flagellata, (Tab. XXIII. figg. 1, 4, 44, 6.) ; 
Ampullaria flagellata, Say, in New Harmony Disseminator of Useful Knowledge, ii. p. _ 
(descriptions, p. 22) (1827) 1, ed. Binney, p. 147°; Hald. Monogr. Limniades, vill. p. 10 ; 
Binney, Land and Freshw. Shells N. Am. iii. p. 7‘; Strebel, Beitr. Mex. Land- und Sussw.- 
Conch. i. p. 26, +. 3. fig. 14, t. 3a. figg. 14, 14a-k, 15°; Fisch. & Crosse, Miss. Scient. 
Mex., Mollusca, ii. p. 239°; Pilsbry, Proc. Acad. Phil. 1891, p. 325 . 
Ampullaria ochracea, Jay, Catalogue of Shells, 1839, p. 116, t. 3. fig. 8°, 
