80 TRACHELIPODA. 



apex nipple-like ; no canal ; columella plicate, the lower 

 plaits larger and more oblique than the others ; no columellar 

 lamina. 



This genus is divided into four sections, — I. Shell ventri- 

 cose ; 2. shell ovate, spinous, or tubercular; 3. shell oval, 

 and subtubercular ; 4. shell elongated, ventricose, nearly 

 fusiform — The following illustrates section 2. 



Valuta Vespertilio. — The Bat Volute. Plate XI. fig. 

 7. Shell turbinate, with acute spires on the volutions ; 

 summit slightly obtuse ; columella four-plaited. Three 

 inches long. Inhabits the Indian seas. 



Genus 10 — MITRA Lamarck. 



Generic Character. — Shell turreted, or sub-fusiform, with 

 the spire pointed ; base emarginate, without a canal ; colu- 

 mella plicate, the plaits being parallel and transverse, the 

 lower ones smallest ; pillar lip thin and adnate. 



Mitra pontificalis The Pontifical Mitra. Plate XI. 



fig. 9. Turreted, ovate ; covered with a yellow-olive epi- 

 dermis, beneath which are interrupted bands of orange spots; 

 spire crowned with tubercles. Two and a half inches long. 

 Inhabits the Chinese seas. 



Genus 11 COLOMBELLA Lamarck. 



Generic Character. — Shell oval; spire short; base of the 

 aperture more or less emarginate, and destitute of a canal ; 

 columella plicate ; outer lip with an internal prominence, 

 which contracts the aperture. 



Colombella mercatoria. — The Cobimercial Colo3Ibel- 

 LA. Plate XI. fig. 10. Ovate, white, sulcated, transversely 

 clouded with brown, or yellow-orange ; outer lip with 

 internal dentations. An inch long. Inhabits the West 

 Indian seas. 



FAMILY III. PURPURIFERA. 



Shell with a short canal posteriorly ascending, or with 



