LEPTINARIA. 321 
17. Leptinaria hapaloides, sp. n. (‘fab. XVIIL fig. 16.) 
Testa turrita, perforata, solidula, subarcuatim leviter plicatula, nitidula, alba; anfr. 8, sat convexi, sutura 
gradata, ultimus basi bene rotundatus. 
Apertura leviter obliqua, trapezoideo-piriformis, margine externo 
superne et inferne arcuato, medio stricto, 
distincte arcuatim producto, margine basali subanguste rotundato ; 
margo columellaris basi crassiusculus, arcuatus, medio distinete tortus et dentatus, superne crassus, 
dilatatus, leviter concavus ; paries columellaris callo fere nullo. 
Long. 11, diam. 4; apert. long. 33, lat. 2% millim. 
Last whorl, seen from the dorsal side, to the whole length of the shell as 1: 23. 
Hab. S.W. Costa Rica: on burned soil, on the plains of the Rio Grande de Terraba, 
at an elevation of 20 metres above the sea (Pittier, April 1892). 
Very distinct on account of the elongated form and the arcuated folds. 
18. Leptinaria ambigua, sp. n. (Tab. XVIII. fig. 17.) 
Testa oblongo-turrita, latiuscule rimata, leviter et eequaliter striatula, nitidula, pallide flavescens, apice obtusa ; 
anfr. 7, planiusculi, equaliter et lente crescentes, sutura modice impressa, ultimus basi convexe attenuatus. 
Apertura paulum obliqua, piriformis, margine externo leviter arcuato, vix antrorsum convexo, basali 
anguste rotundato; margo columellaris basi oblique truncatus et plica tenui gracili spirali circumvolutus, 
-dein concaviusculus, supra leviter dilatatus et appressus ; paries aperturalis leviter callosus, inermis. 
Long. 11, diam. 33-4; apert. long. 34, lat. 2 millim. 
39 10, ” 33 3 9 3, 9 2 
9 9, » 4; ” 3, 4 2 ” 
Length of the last whorl, seen from the dorsal side, to the whole length of the shell as 1: 23-23. The 
dimensions of an apparently young specimen from the same locality are—long. 1, diam. 4; apert. long. 3, 
lat. 2; last whorl 1: 23. 
99 
Hab. N.E. Costa Rica: Puerto Viejo, at the confluence of the river of this name with 
the Sarapiqui (Biolley, 1893). 
Centrat Costa Rica: La Palma (Pittier). 
This species, at first sight, more resembles an Opeas than a Leptinaria, on account 
of its general form and the want of prominent coste; the columellar margin, however, 
is not only obliquely notched, but has a slender spiral fold twisted round its lowest 
part and clearly separated from it by a slender furrow. ‘This fold is also very much 
nearer the base of the aperture than in the other species of Leptinaria. 
Nore.—Spiraxis dubia, Pfeiffer, already mentioned by me, anted, p. 90, and figured on 
Tab. V. fig. 10, may perhaps be more nearly allied to Leptinaria than to Streptostyla. 
B. Species with a parietal plate or tooth. 
Tornatellina (part.), Pfeiffer (1848); Tornatellina, A. Leptinaria, Pfeiffer (1877); Leptinaria, 
Fischer & Crosse (1877). 
19. Leptinaria solida, sp.n. (Tab. XVIII. fig. 18.) 
Testa. conoideo-ovata, semiaperte perforata, sat solida, subtiliter striatula et costulis membranaceis sub- 
distantibus plus minusve caducis ornata, nitidula, albida; anfr. 63, superiores paulum convexi, sutura 
distincta, subgradata, ultimus basi magis convexus, subsaccatus. Apertura parum obliqua, trapezoidea, 
? 
BIOL. CENTR.-AMER., Terr. and Fiaviat. Mollusca. October 1898. 41 
