GASTROCOPTA, NORTH AMERICA, WEST INDIES. 61 



or less on the columellar side (pi. 10, figs. 8, 9). The colu- 

 mellar lamella is simple, short and horizontal, its inner end 

 having only a very low, hardly perceptible buttress below. 

 The lower palatal plica is a little longer than in rupicola. 

 The surface is rather distinctly striate. 



Length 2.45, diam. above aperture 1.23 mm. Matanzas, 

 fig. 13. 



Length 2.5, diam. above aperture 1.1 mm. Matanzas, fig. 12. 



Cuba: hillside west of Matanzas and on the west side of 

 Matanzas Bay (Pilsbry) ; Loma de Capiro, Santa Clara; San 

 Vicente de los Banos (J. B. Henderson) ; San Jose (Ch. 

 Wright in U. S. N. M.). Jamaica (Gloyne in A. N. S. P.). 

 Bermuda: Church Cave, near Tuckerstown, etc. (Vanatta, S. 

 Brown and others). 



Pupa marginalia PPR., Wiegmann's Archiv. fiir Natur- 

 geschichte, 1840, i, p. 253; Monographia Hel. Viv., ii, 1848, 

 356; iii, 555; iv, 680; vi, 327. KUSTER, Syst. Conchylien 

 Cabinet, p. 89, pi. 12, f. 22, 23. Vertigo marginalba Pfr., 

 POEY, Memorias sobre la Hist. Nat. Cuba, ii. p. 13. ARANGO, 

 Fauna Malacologica Cubana, p. 103 (Cogimar, under stones). 



This is a common shell around Matanzas (pi. 11, figs. 12, 

 13; pi. 10, figs. 8, 9), also in Bermuda (pi. 11, figs. 10, 11), 

 varying considerably in shape and in the thickness of the lip. 

 I have found beautiful albino specimens with the dark ones 

 on the west side of Matanzas Bay, and it is evident that 

 Pfeiifer's unique type was of this kind. The name was un- 

 fortunate, for normally the lip is colored. The degree to 

 which the angulo-parietal lamella appears bifid varies (pi. 10, 

 figs. 8, 9) ; also the projection on the columellar side, which is 

 sometimes wanting in lots where most shells have ft developed. 



Variety. In some lots the parietal and angular lamellae are 

 more fully concrescent, forming a nearly simple and more 

 slender lamella, as in pi. 10, fig. 8. 



Some small and slender specimens from San Vicente Banos, 

 Cuba (pi. 10, fig. 6), taken by Henderson, appear to me to be 

 either a race of marginalba or a closely related subspecies. 

 The angular lamella forms a lobe at its junction with the 

 parietal, the anterior end of the latter projecting on the colu- 



