GASTEROPODA. 



181 



late, the edge slightly thickened and reflected, and often 

 with a single tooth on the outer side of the inner lip."* — 

 23 species. 



The shells are found in South America, Senegambia, 

 and India, and are separated from Helix on account of the 

 eccentricity of the penultimate whorl. 



Proserpina. Gray. ( Odont ostoma D'Orb.) — ■ Shell 

 Helix-shsiiped, the base covered with a shining 

 callosity ; the aperture has inner plaits ; the lips 

 are plain and sharp. Animal unknown. — 5 spe- Proserpina. 

 cies. 



Found in Cuba and Jamaica. 



Bulimus. Brug. — Shell oval, turreted, last whorl 

 large; aperture having the mar- 

 gins disunited at the upper part, 

 long, not wide ; lip thickened and 

 reflected in the adult; spire ob- 

 tuse, but much more prominent 

 than in the Helix. Animal very 

 like the Helix. — 662 species f; 

 also fossil. 



These shells are found in al- 

 most every part of the world, 

 from the torrid to the frigid 

 zones; in the former they attain 



a large size, and are beautifully marked with lemon, 

 amber, and sea-green, which colours rarely exist amongst 

 other shells. Many of the species are reversed. They are 

 more commonly found on islands, or on the margin of the 

 sea amongst rocks and trees, than in the interior of the 

 country, but Mr. Cuming has brought them from the arid 



Bulimus oblongus. 



* Sowerby's Conch. Manual. 



f Reeve's Iconica. 



