58 PRYMJEUS, MEXICO AND CENTRAL AMERICA. 



simple, the terminations separated, columellar margin a little ex- 

 panded, reflexed and appressed, basal and outer margins acute. 



Alt. 30, diam. 11, length of aperture 15J mill. (C. $ F.). 



N. Guatemala: San Luis de /Wm*( Morelet). 



Bulimus lirinus MOREL., Testae. Noviss. ii, p. 11 (1851) PFR., 

 Monogr. iii, p. 313; viii, p. 26 Bulimulus {Drymaus} lirinus FISCH. 

 & CROSSE, Miss. Scient. Mex., Moll, i, p. 494, pi. 20, f. 10. 



D. CUCULLUS (Morelet). PL 1, figs. 88, 89. 



Shell imperforate, oblong-ovate, thin, rather obliquely rugose- 

 striate, milky-whitish, spire rather long, the apex rounded, rather 

 obtuse ; suture impressed. Whorls 4, convex, the embryonal 1^ 

 smooth, hyaline, the last whorl large, ventricose, longer than the 

 spire, somewhat attenuated at base. Aperture acuminate-ovate, 

 within shining and colored like the outside ; peristome simple, the 

 margins joined by a rather thick white callus; columellar margin 

 dilated, whitish ; basal and outer margins acute. 



Alt. 18, diam. 8, length of aperture 9J mill. (C. $. F.) 



Yucatan: Sisal, on sandy ground (Morelet). 



Bulimus cucullus MORELET, Test. Noviss. i, p. 9 (1849) PFR. 

 Monogr. Helic. Vivent. iii, p. 383 ; in Martini & Chemnitz, Sj'st. 

 Conch. Cab. ed. 2, Bulimus, p. 217, pi. 60, fig. 11, 12. Bulimus 

 (Leptomerus) cucullus PFR. in Malak. Blatt. ii, p. 159 (1855). 

 Bulimulus (Mormus} cucullus MARTENS in Albers' Die Helic., ed. 2, 



p. 216 Bulimulus (Scutalus} cucullus FISCII. & CROSSE, Miss. 



Scient. Mex., Mollusca, i, p. 519, pi. 20, fig. 11 ; with var. gracilior, 

 loc, cit. p. 519, pi. 20, fig. 12. 



The var. gracilior, pi. 1, fig. 88, is probably only an extreme indi- 

 vidual variation rather than a true variety. It measures: alt. 17, 

 diam. scarcely 7, length of aperture 9 mill. 



GROUP OF D. ATTENUATUS. 



D. FENESTRELLUS (v. Martens). PI. 2, figs. 1, 2, 3, 4, 5. 



Shell minutely perforate, ovate-conic, thin but moderately strong ; 

 white, with 4 or 5 broad interrupted bands composed of large square 

 purple-brown spots ; the bands rarely subcontinuous, occasionally re- 

 duced to few spots or none by encroachment of the white streaks. 



