LEPTINARIA. 313 
the columellar margin as twisted or toothed. Strebel has included in the same species 
shells of very different outlines, according to his figures, and I am compelled to follow 
him, having seen very few Mexican specimens. On the other hand, through the 
kindness of Mr. H. Pittier and Mr. P. Biolley, there are before me many specimens 
from Costa Rica, but only a few of them can be identified as belonging to described 
species. As regards the columellar margin, it may be twisted as a whole (marg. 
columellaris tortus), or may have its chief part straight and only the inward edge 
transformed into a spiral fold, separated by a slight depression from the main part 
(marg. col. plica circumvolutus) ; in either case, the under edge of the twisted portion 
projects more or less distinctly in the shape of a tooth (dentatus). But in the 
descriptions of the various authors this difference is often not clearly stated; the term 
“marg. col. plicatus” (folded) applying to both. 
In the comparative table I am obliged, however, to use the terms applied by the 
authors themselves in their descriptions for all the species of which I have no 
specimens or figures before me; in some cases, therefore, the differences given may be 
more apparent than real. 
This genus is represented in the West-Indian Islands, in Central America, Colombia, 
Venezuela, Ecuador, Bolivia, Peru, and Brazil, but is absent from the United States of 
North America. The most northern species are, so far as I know, L. meaicana, Pft., 
from Misantla, Mexico, and L. paludinoides, @Orb., from Cuba; the most southern an 
undetermined form found by H. v. Ihering at Taguara del Mondo Novo, in the 
province of Rio Grande do Sul, Brazil. Within our limits the species are distributed 
as follows :— 
Group A. Group B. 
East Mexico: L. mexicana and vars. turrita and abbreviata, 
L. martensi and var. inflata, L. imperforata. 
South-east Mexico (Tabasco) : L. exigua. 
North Guatemala: ZL. guatemalensis. L. elise, L. emmeline. 
West Guatemala: Z. guatemalensis, L. stolli. 
East Guatemala: L. filicostata. 
Honduras: L. mexicana, L. filicostata, L. simpsoni, L. fordiana. 
Central Nicaragua: L. sinistra. 
East Nicaragua: L. hyalina. 
North-west Costa Rica: L. guatemalensis, var. majuscula. 
North-east Costa Rica: L. ambigua. L. solida. 
Central Costa Rica: L. ambigua, L. pittieri and var. obliquata, L. convoluta. 
L. guatemalensis, var. majuscula, L. biolleyi, L. costa- 
ricana. . 
East Costa Rica: L. pittieri, L. crenulata, L. biolleyt. 
South-east Costa Rica: ZL. interstriata. 
South-west Costa Rica: L. pittieri, L. interstriata, L. guate- L. solida, L. convoluta. 
malensis, var. majuscula, L. costaricana, L. hapaloides. 
North Panama: L. interstriata. 
BIOL. CENTR.-AMER., Terr. and Fluviat. Mollusca, June 1898. 40 
