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 Placostyius. The dimensions are variable. Whorls 

 7y 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). PL 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 2y 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 

 GrMEL., Syst. Nat. (13), p. 3655. Bulimus obtusatus GMEL., 

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



