TRACHELIPODA. 81 



an oblique notch at the base of the aperture, directed 

 backwards. 



Sub-Division 1. — Having an oblique notch directed 

 backwards. 



Genus 12— TEREBRA Lamarck. 



Generic Character. — Shell elongated, turreted, acumi- 

 nated; aperture longitudinal, several times shorter than the 

 spire, emarginate; base of the columella contorted and 

 oblique. 



Terebra vittata. — The Filleted Terebra. Plate XI. 

 fig. 12. Pale fawn-coloured, smooth ; body, and volutions 

 transversely striated at the top, and with transverse purplish 

 bands, occupying nearly its lower half. One inch long. In- 

 habits the Indian ocean. 



Genus 13.— EBURNA.—Za/warcA. 



Generic Character — Shell ovate or elongated ; the outer 

 lip simple; aperture longitudinal; emarginated at the base; 

 columella umbilicated above, with a canal below the 

 umbilicus. 



The peculiar character of the umbilicus and of the columella, Avhich 

 is prolonged at the lower base and forms a canal occupying the remain- 

 ing part of tlie left side, is a striking featui-e in this genus. 



Ehurna Zeylanica. — The Ceylon Eburna. Plate XI. 

 fig. 13. Smooth, white, with irregular large yellowish-brown 

 spots ; apex acute, smooth, white ; sutures distinct, canal of 

 the columella scaly. Two and a half inches long. Inhabits 

 the coasts of Ceylon. 



Genus 14.— BUCCINUM. —Zmn^MS. 



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

 ture longitudinal, with the base emarginate; no canal; colu- 

 mella not flattened, turgid above. 



Sub-division Nassa. The shells have a callous colu- 

 mella. 



