362 MOLLUSCA. 
Hab. Yucatan: in cisterns and small streams in the suburbs of Merida (Morelet 13). > 
CentraL Costa Rica: rivers near San José, as Maria Aguilar, Torres, and Virilla 
(Biolley 2). . 
Var. minor. (Tab. XX. figg. 9, 10.) 
.? Physa spiculata (Morel.), Strebel, Beitr. Mex. Land- und Siissw.-Conch. i. p. 56, t. 7. figg. 31, 
31a, b*. 
Aplecta cisternina, var. 8. minor, Fisch. & Crosse, loc. cit. p. 94, t. 30. fig. 8°. 
a. Long. 15, diam. 8; apert. long. 10, lat. 5 millim. 
b. ” 153, ” 14 ; ” 11, 29 4} 9 
¢. ” 14, ” 6 3 99 93, ” 35 ” 
d 99 10, 99 5) 3 99 62, 99 2 99 
a and 6, Measurements given by Morelet and Fischer and Crosse; ¢ and d. Specimens from Uspantan. 
Hab. Yucatan: Merida, with the typical form (Morelet®); Yucatan, in cisterns. 
(Berendt +) ; Tabi, near Sotuta (Godman). 
CENTRAL GUATEMALA: San Miguel Uspantan, Dep. Quiché, in a small stream, and 
San Antonio, north of the city of Guatemala (S¢o//). 
Var. ventrosior. 
Physa cisternina, var. ventrosior, Morelet, Test. Noviss. p. 15 (1851) °. 
Physa stolli, Clessin, in Martini & Chemnitz, Syst. Conch.-Cab. ed. 2, Limnziden, p. 293, t. 42. 
fig. 11 (1885) ’. 
Aplecta cisternina, var. y. abbreviata, Fisch. & Crosse, Miss. Scient. Mex., Mollusca, p. 95, t. 30. 
fig. 9 (1886) °. 
a. Long. 15, diam. 9; apert. long. 11, lat. 5 millim. 
b 6, «12, 4 64; ” 9, ,3 4 
ce ,, 15-16,, 8; ” 10, , 4 4, 
a. Measurements given by Fischer and Crosse; ¢. by Clessin; 6. Specimen from Capetillo. 
Hab. Yucatan: Merida, with the type and the var. minor (Morelet °-8). 
N. Guaremata: Peten and Alta Vera Paz (Bocourt 8). 
W. Guatemala: Antigua, in wells within the city (Stoll, in Mus. Berol.) ; Guatemala, 
without nearer indication of locality (Stol/") ; Capetillo (Champion). 
Centra Costa Rica: Sabana Canal (Biolley, in Muss. Berol. and Neuchétel). 
Var. gracilis. 
Aplecta cisternina, var. 6. gracilis, Fisch. & Crosse, loc. cit. p. 95, t. 30. fig. 10°. 
Long. 14, diam. 6; apert. long. 10, lat. 4 millim. 
Fischer and Crosse give no special locality for this variety. 
Subgen. STENoPHYsa, n. 
Shell oblong, with flat whorls and pointed apex, very glossy, unicolorous: columellar 
margin comparatively long and straight, white. Edges of the mantle indented. 
Having ascertained that indentations on the edges of the mantle are present in 
