70 TRACHELIPODA. 



simple ; aperture longitudinal ; emarginated at the base ; colu- 

 mella umbilicated above, with a canal below the umbilicus. 



The peculiar character of the umbilicus and of the columella, which is 

 prolonged at the lower base and forms a canal occupying the remaining 

 part of the left side, is a striking feature in this genus, 



Eburna Zeylanica.— The New Zealand Eburna. Plate 

 XI. fig. 13. Smooth^ white, with irregular large purplish spots ; 

 apex acute, tipped with lilac ; sutures with an elevated line. 

 Two and a-half inches long. Inhabits the South seas. 



Genus 14..— BUCCINUM — Linnceus. 



Generic Character. — Shell ovate, or ovato-conical ; aperture 

 longitudinal, with the base emarginate ; no canal ; columella not 

 depressed, and turgid above. 



Sub-division. — Nass4. The shells have a callous columella. 



Buccinum undatum. — The Waved Buccinum. Plate XI. fig. 



14. Ovato-conical, ventricose ; obliquely sulcated ; striated 

 transversely and longitudinally ; covered with a yellow olivaceous 

 epidermis ; volutions convex ; aperture white or yellow. Four 

 inches long. Inhabits the European seas. 



Genus 15 D0lA\5M..—iyArgenviUe. 



Generic Character. — Shell thin, ventricose, inflated; fre- 

 quently subglobose, very rarely oblong ; transversely ribbed ; 

 outer lip dentated or crenated ; aperture longitudinal, emarginate 

 at the base. 



Doliuni perdix. — The Partridge Dolium. Plate XI. fig. 



15. Ovate, oblong, thin, reddish-brown, clouded and spotted 

 with white ; thickly ribbed and convex. Four inches long. 

 Inhabits the Tropical seas. 



Genus 16.— R ARP A.— Lamarck. 



Generic Character. — Shell ovate, more or less turgid ; with 

 longitudhial, parallel, compressed, inclined ribs ; spire short ; 

 aperture longitudinal, emarginate below ; without a canal ; 

 columella smooth, flattened, and acute at the base. 



