MEXICAN LEPTINARIA. 323 



late, ornamented with some sparse membranous riblets on the 

 upper whorls, glossy, gray. Whorls 6, moderately convex, 

 the suture simple and moderately deep, last whorl strongly 

 rounded basally. Aperture subvertical, emarginate-ovate, 

 the outer margin arcuately produced, basal margin shortly 

 rounded, columellar margin broadly truncate below, inwardly 

 convolute, subvertical, not dilated above. Parietal wall cov- 

 ered with a very thin callus and encircled with a deeply en- 

 tering, slender spiral lamella in the middle. Length 7, diam. 

 4.5 to 5, aperture 4x2.5 mm. (Marts.}. 



Costa Rica: Santa Clara. (Biolley) ; Golfo Dulce (Pittier) 

 and Turubares (Biolley), on the Pacific slope. 



L. convoluta MARTS., Biologia, p. 322, pi. 18, f. 20, 20a 

 (Oct., 1898). 



"Beyond the spiral plate, the whole columellar margin is 

 transversely rounded towards the interior, like a cornet or 

 paper-bag, for which I use the term ' convolutus. ' The 

 parietal plate is very low, and only to be seen by looking 

 into the aperture from above (fig. 34)" (v. Mis.}. 



41. L. EMMELIN^E Tristram. PI. 42, figs. 35, 36. 



Shell elongate, rather thin, opaque, glossy, slightly striat- 

 ulate ; spire conic, a little acuminate. Whorls 7 to 8, convex, 

 the last scarcely as long as the spire, smoothish. Columella 

 twisted inward, lucid whitish inside. Peristome slightly ex- 

 panded, the right margin compressed. Aperture furnished 

 with an acute tooth above. Length 15, diam. 5 mm. (Tris- 

 tram) . 



Guatemala: Coban (Salvin). 



Leptinaria emmelina TRISTR., P. Z. S., 1861, p. 231. MAR- 

 TENS, Biologia, p. 323, pi. 18, f. 21. 



This form seems closely related to the large South Amer- 

 ican species. Prof, von Martens writes: "The specimens 

 which Mr. Salvin has sent me under this name are much 

 smaller than the measurements given by Canon Tristram, 

 and want the parietal tooth or plate mentioned by him; they 

 are, probably, young individuals, and the typical one seems 

 to have been lost. That which agrees best with the deserip- 



