S34 SHELLS AND SHELL-FISH. PART II. 



SUB-FAM. 4. ACHATIN^E. 



Shell spiral ; aperture oblong or oval, always equal, and 

 generally shorter than the spire.* 



CLAUSILIA Drap. Aperture oblong, with teeth on both 

 sides t; shell cylindrical. 



Pupella Sw. J Spire moderate, obtuse ; the whorls of 

 equal thickness; basal whorl and aperture small; 

 the latter with teeth on both sides ; the lips not 

 thickened. 



frumentum. Drap. 3. f.51,52. vertigo. Bow. Conch. 8. 



variabilis. Ib. f. 55, 56. f. 35. 



Eruca Sw. General habit of the last ; but the tip of 

 the spire is thicker, and there is only one, or no 

 plate, upon the inner lip only. 



tnuscorum. Drap. 3. f. 36-38. dolium. Drap. 3. f. 43. 

 fragilis. Ib. 4. f. 4. umbilicata. Ib. 3. f. 39/40. 



Balia Gray. Spire very long, of numerous persistent 

 whorls ; aperture simple, without teeth or folds. 

 B. fragilis. Drap. pi. iv. ventricosa. Zool. Journ. i. pi. 

 f. 4. 5, 6. 



Clausilia Drap. Spire very long, but the upper portion 

 deciduous ; aperture oblong, ear-shaped, with teeth 

 on both sides; the lips united, and their edges 

 spreading, 

 papillaris. Drap. 4. f. 13. plicatula. Ib. 4. f. 17, 18. 



Macrodontes Sw, Size larger; bulimiform ; spire longer 

 than the aperture, which is surrounded with large 

 teeth ; lips united ; the outer large, dilated, and the 

 edge reflected. Tropical America only. 



M. Sowerbeyii Sw. Zool. Journ. i. pi. 5. f. 2. 



2. BULIMUS. Basal whorl ventricosc ; outer lip mar- 



* Except in Helicina and the turbinated Cycfostomce. 



f Except in Balia, which has no teeth. 



j Including the European PuptE, Vertigo, and Alee. 



