322 MOLLUSCA. 
margine externo antrorsum convexe producto, basali bene rotundato; margo columellaris crassus, 
verticaliter ascendens, plica valida lamelliformi intrante in inferiore parte circumvolutus, supra dilatatus ; 
paries aperturalis callo lato et in hujus media parte plica gracili spirali preeditus. 
Long. 12, diam. 62; apert. long. 6, lat. 6 millim. 
° 1 1 
” ll, ” 6 ’ ” 53, ” 33 9 
. 1 
29 10, ry) 53 ? 9 43, oe) 3 ” 
1 <n 
” 93, ” v5 ” 5, ” 3 9 
The diameter of the aperture includes the columellar margin. 
Last whorl, seen from the dorsal side, to the whole length of the shell about as 1: 14. 
Hab. N.E. Costa Rica: Puerto Viejo, at the confluence of the river of the same name 
and the Sarapiqui (Biolley, 1893). 
S.W. Costa Rica: Alto de Mano Tigre, near Terraba, at an elevation of 690 metres 
above the sea (Pittier). 
20. Leptinaria elisa, of. yt. (Tab. XVIII. fig. 19.) 
Leptinaria elise, Tristr. P. Z. 8. 1861, p. 231’; Fisch. & Crosse, Miss. Scient. Mex., Mollusca, 1. 
p-. 625°. 
Tornatellina elise, Pfr. Monogr. Helic. Vivent. vi. p. 263°. 
Hab. N. Guatemata: Coban (Salvin 1). 
The two specimens of this species sent for examination by Mr. Salvin have the shell 
moderately thin, imperforate, nearly smooth, ovate, pale yellowish, the whorl before the 
last rather large, the last seen from the dorsal side being to the rest of the length of 
the shell as 1:2. The columellar margin is much arcuated beneath, thick and strongly 
twisted above, the twisting ending towards the underside in a strong projection. The 
tooth on the parietal wall is compressed, lamelliform, almost equally distant from 
the columella and from the outer margin, and does not reach far into the interior of the 
aperture. ‘The dimensions of the two specimens are :— 
Long. 94, diam. 5?; apert. long. 54, lat. 3? millim. 
» 8 4, 43; ” 4, 4, 38 » 
In the larger example a part of the outer wall of the aperture is broken away, 
therefore the diameter both of the whole shell and of the aperture must have been 
greater when entire. The other specimen possesses an equally developed tooth 
or plate on the parietal wall; it is probably also full-grown. In neither shell can I see 
what Canon ‘Tristram meant by the words “margine dextro sulcato”; but as he 
gives the length as 103 and the diameter as 6 millim., he seems to have had a larger 
specimen than ours. 
21. Leptinaria convoluta, sp.n. (Tab. XVIII. figg. 20, 20a.) 
Testa conico-ovata, imperforata, diaphana, subtiliter striatula, costulis nonnullis sparsis membranaceis in anfr. 
superioribus ornata, nitida, grisea; anfr. 6, modice convexi, sutura simplice modice profunda, ultimus basi 
valde rotundatus. Apertura subverticalis, emarginato-ovata, margine externo arcuatim producto, basali 
breviuscule rotundatus; margo columellaris infra late truncatus, introrsum convolutus, subverticalis, 
