SAGDA-ZAPHYSEMA. 65 



Subgenus ODONTO?AGDA Martens, 18GO. 

 Odontosagda MARTENS, in Albers, Die Hel., p. 78. 



Shell small, depressed, thin, whitish, smooth, umbilicated, with 5-6 

 convex narrow whorls; base convex. Aperture subvertical, Innate, 

 the lip thin and simple; interior having upon the basal wall several 

 spiral lamiiice interrupted into teeth, or with such a spiral lamina and 

 a series of transverse blades ; columella thin, not calloused nor toothed. 

 Type S.polyodon (see pi. 20, figs. 35, 36, S. hilled Guncll.). 



Anatomy unknown. Distribution, Haiti and eastern Cuba. This 

 group differs from the toothed Sagdas of Jamaica in the perforated 

 or umbilicate shell and the interrupted laminae. 



S. polyodon "Weinl. & Mart, ii, S. blandi Weinl. iii, 8. 



[201. 8. hillei Gundl. ii, 199. 



Species erroneously referred by authors to Sagda: H. epistyllnlnm 

 C. B. Ad. is a G'ttppya. H. circumftrmata and discrepans belong to 

 the Zonitidas, genus Poecilozonites. 



Genus ZAPHYSEMA Pilsbry, 1894. 

 Cysticopsis, in part, of authors. 



Shell globose, thin, unicolored brownish, smooth except for slight 

 growth-wrinkles; imperforate, the axis solid; composed of 5 to 5 

 convex whorls the embryonic shell consisting of two whorls, its junc- 

 tion with the after-growth marked by an indistinct oblique line ; the 

 last whorl much ivider, large and inflated, hardly deflexed in front. 

 Aperture large, round-lunate, moderately oblique, and toothless ; the 

 Up thin, sharp and simple, dilated and closely 'appressed at the 

 white-calloused columella. Type Helix tenerrima C. B. Ad., pi. 16, 

 fig. 21. 



Foot black, rather short, granulated and obliquely grooved above, 

 as in Thysanophora and Sagda, the tail obtuse, having a median lon- 

 gitudinal groove above ; anterior half of the foot traversed on each 

 side by an obliquely descending groove arising about the middle of 

 the mantle insertion. Sole indistinctly tripartite. 



The figures of the foot of Thysanophora peraffinis (pi. 15, figs. 8, 

 9, upper and lateral views) well represent that of Z. tenerrima also. 



Genital system having a short vertibule. Penis long, the vas def- 

 erens inserted near the apex, where a long flagellum and a curved 

 appendage are inserted ; at the lower third of the penis arises an 



