MEXICAN LEPTINABIA. 315 



su'bpiriform, but slightly oblique, subeffuse at base; outer 

 margin sinuous, slightly receding at the upper angle and at 

 base; columellar margin thickened, straight, strongly twisted 

 inward, with a very oblique but slight truncation; peristome 

 simple and acute. Length 6.75, diam. 3.66, aperture 3.33 x 

 1.75 mm. (Anc.). 



Honduras: Island of Utila (C. T. Simpson). 



Nothus fordianus ANC., Ann. de Malac., ii, p. 248 (1886). 



This Nothus is dedicated to Mr. John Ford of the Acad- 

 emy of Philadelphia. It is most nearly related to N. simp- 

 soni. It is imperforate like that, but is smaller, of narrower, 

 more ovate form, the spire less long conic, last whorl higher, 

 as long as the spire and more regularly rounded ; the summit 

 is less obtusely rounded; the width of the shell is greater. It 

 resembles certain Leptinaria in contour and general char- 

 acters excepting the parietal lamella, especially L. antillarum 

 Shuttl. of Guadeloupe (Anc.}. 



My figure is drawn from one of the original lot, the indi- 

 vidual measuring, length 7.3, diam. 3.6, aperture 3 mm., with 

 6 whorls. One shell before me is a little larger, with less 

 abruptly truncate columella. The fine, arcuate striation is 

 very similar to that of L. simpsoni, which is very closely re- 

 lated. In some shells there is a minute chink behind the 

 columellar lip. 



31. L. YUCATANENSIS n. sp. PL 42, figs. 27, 29. 



Shell openly perforate, acutely ovate-conic, whitish-cor- 

 neous, brown- tinted towards the summit; irregularly, some- 

 what coarsely striatulate, moderately glossy. Spire straightly 

 conic, the apex rather small. Whorls 6%, convex, the first 

 2^/2 smooth; last whorl very convex basally, but scarcely 

 smoother there. Aperture ovate, hardly oblique; outer lip 

 very slightly arched forward. Columellar lip dilated and 

 built forward above, leaving a widely open umbilical perfor- 

 ation, very obliquely truncate at base, and bearing a weak, 

 obliquely entering fold. Parietal callus very thin. Length 

 6.6, diam. 2.9, aperture 2.4 mm. 



Yucatan: Labna (Heilprin exped., 1890). 



