20 MOLLUSCA. 
Oo 
margine externo regulariter arcuato, antrorsum convexo, basali anguste rotundato 3 margo columellaris 
verticalis, peroblique truncatus et plica tenui gracili circumvolutus ; paries aperturalis inermis. 
Long. 6-7, diam. 3; apert. long. 3, diam. 2 millim. 
Last whorl, seen from the dorsal side, to the whole length of the shell as 1 : 23. 
Hab. Centrat Costa Rica: environs of San José, 1135 metres above the sea, among 
moss (Biolley). 
E. Costa Rica: Talamanca (Pittier, March 1895). 
Allied to L. salleana, Pfr., from Haiti (Strebel, Beitr. Mex. Land- und Stissw.-Conch. 
v. t. 17. fig. 4), but with more feeble columellar margin. 
13. Leptinaria simpsoni. 
Nothus simpsoni, Ancey, Ann. de Malac. 1886, p. 245°. 
Hab. Honpuras: Utila Island (Simpson'). 
14. Leptinaria fordiana. 
Nothus fordianus, Ancey, Ann. de Malac. 1886, p. 248°. 
Hab. Honpvuras: Utila Island (Simpson 1). 
15. Leptinaria costaricana, sp.n. (Tab. XVIII. fig. 15.) 
Testa ovato-oblonga, subturrita, rimata, solidula, striatula, nitida, pallide flavescens ; anfr. 6-7, convexiusculi, 
regulariter crescentes, sutura modice impressa, subgradata, ultimus basi sensim attenuatus. Apertura 
paululum obliqua, trapezoidea, margine externo subrecto, basali late rotundato; margo columellaris oblique 
truncatus, verticaliter ascendens, plica spirali angusta intrante circumvolutus; paries aperturalis inermis. 
Long. 9, diam. 4; apert. long. 3-4 millim. 
, ” 6-7, 9 3; ” 3 ” 
Last whorl, seen from the dorsal side, to the whole length of the shell as 1: 24-23. 
Hab. Centrat Costa Rica: San José (Pittier, 1893; Biolley, 1895). 
S.W. Costa Rica: Terraba, especially on burned soil, in the woods of the plain of 
Terraba (Pittier, April 1892); El Pital, in the valley of Rio Naranjo, at an 
elevation of 200 metres above the sea (Madame Pittier, March 1893); plain of 
the Rio Corredor, in the region of the Golfo Dulce (Pittier, 1897); Quebrada de 
Java, valley of the Rio Brus, 900 metres above the sea, among vegetable detritus, 
and at the thermal springs of Djiri Durunia, in the same valley (Pittier, 1897); 
valley of the Rio Diquis (Pitter, March 1893). 
Allied to Z. mexicana, but of larger size, with comparatively greater diameter of the 
last whorl and fainter sculpture. 
16. Leptinaria imperforata. 
Lamellaxis imperforatus, Strebel, Beitr. Mex. Land- und Siissw.-Conch. v. p. 118, t. 7. fig. 14, 
and t. 17. fig. 2 (1882)?, 
Hab. EK. Mexico: Jalapa, on a strawberry-plant (stefania Salas). 
