196 CLAVATOR. 



arcuate, oblique plicae. The columella is strongly, obliquely 

 truncate, though this scarcely appears except in an oblique 

 view. The columellar margin is broadly dilated and con- 

 cave. The later third of the last whorl ascends as in many 

 species of Placostylus. The dimensions are variable. Whorls 

 7i/ 2 to 9. 



Length 102, diam. 44; aperture 48x31 mm. (type of 

 placostyloides) . 



Length 107, diam. 42; aperture 46.5x29 mm. (type of 

 vayssieri) . 



Length 88, diam. 42 mm. (Dautzenberg). 



Length 85, diam. 42 ; aperture 44x33 mm. (var. abbreviata) . 



The variety abbreviata Kobelt is merely a short specimen. 

 Dautzenberg notes a " var alba, entirely white under a light 

 yellow epidermis, without flammules." 



2. C. OBTUSATUS (Gmelin). PI. 49, figs. 30, 31. 



Shell perforate, slender, turrited, solid. White under a 

 thin yellow cuticle, profusely streaked with chestnut on the 

 last three to five whorls, wanting from the earlier ones. The 

 surface is glossy and closely, evenly striate longitudinally. 

 The first 2% whorls are smooth, but sometimes self-amputated, 

 the orifice closed by a convex partition. Whorls about 10, 

 slightly convex, the suture bordered by a white line. Aper- 

 ture small, its length less than one-third that of the shell, 

 ovate, blue-white inside; peristome white, obtuse, somewhat 

 thickened but not expanded; columellar lip dilated, flattened 

 within ; parietal callous thin and transparent. 



Length 69, diam. 19 mm.; length of aperture with peris- 

 tome 20 mm. 



Length 74, diam. 23 mm. (decollate) ; aperture 24 mm. 



Madagascar: Fort Dauphin (F. Sikora) and Andrahomana 

 (Alluaud) ; Antanarivo (Kobelt). 



Bulimus calcareus BRUG., Encycl. Meth.Fm, 1789, p. 328, 

 no. 50. LAMARCK, An. s. Vert., vi, p. 121; Edit. DESHAYES, 

 viii, p. 228. Not Helix calcaria Born. Helix obtusata 

 G-MEL., Syst. Nat. (13), p. 3655. Bulimus obtusatus GMEL., 

 Pfr. Monogr. ii, p. 151; iii, 396; iv, 455; vi, 94; viii, 130; 



