202 CLAVATOR. 



in the middle; basal margin expanded, spreading, but only 

 slightly reflexed; columellar margin thickened, dilated, re- 

 flexed, nearly closing the umbilicus, peculiarly excavated in- 

 wardly. Parietal callous with a somewhat tooth-like fold, 

 alt. 51, diam. 25 mm., aperture 24 mm. high, 17.5 wide out- 

 side. (Kobelt). 



Madagascar (F. Sikora) . 



Clavator heimburgi KOB., Conchy!. Cab. p. 730, pi. 107, 

 t. 13, 14; Nachrbl. D. M. Ges. 1901, p. 96. 



9. C. EXIMIUS (Shuttle worth). PI. 51, figs. 45, 46. 



Shell dextral, cylindric, thin, striate, obsoletely decussate 

 with wide-spaced spiral lines, olivaceous-brown, somewhat 

 glossy. Spire long, the apex conoid, obtuse, pale. Whorls 

 8, slightly convex, the upper ones slowly, the lower rapidly in- 

 creasing; last whorl two-fifths the total length. Columellar 

 plate thick, white, strongly twisted, tapering downwards and 

 scarcely truncate. Aperture narrow, inverted subauriform; 

 peristome simple, unexpanded, acute. Length 120, diam. 40 

 mm.; aperture 46 mm. long, 24 wide (Shuttlew.). 



Madagascar (Verreaux). 



Spiraxis eximia SHUTTLEW., Diagn. n. Moll. no. 2, in Mit- 



theil. Bernischen naturforschenden Gesellschaft, 1852, p. 



208. PFR. Monogr. Hel. Viv. iii, p. 469. Achatina eximia 



SHUTTW., Notitise Conchologieas ii, p. 13, pi. 4, f. 2 (1877). 



Clavator eximius Sh., KOBELT, Conchy!. Cab. p. 653. 



Shuttle worth's description and figures are reproduced. 

 The type was an immature shell, remarkable for its great 

 size. Smaller forms of the species occurring on the south- 

 west coast, have been described as B. balstoni, and a larger 

 specimen as C. herculea. These several forms seem to be 

 separated by no important differences apart from size. They 

 seem to be local races. 



Bulimus columba Brug., Encycl. Meth. i, p. 319, may have 

 been based upon this species, but it was not recognizably de- 

 scribed, and has never been identified. 



9a. Var. herculeus (Ancey). 



Shell the size of eximia; differs from Cl. balstoni Angas 



