TRACHELirODA. 81 



an oblique notch at the base of the aperture, directed 

 backwards. 



Sub-Division 1. — Having an oblique notch directed 

 backwards. 



Genus 12 —TEREBR A.— Lainarck. 



Generic Character Shell elongated, turreted, acunrji- 



nated; aperture longitudinal, several times shorter than the 

 spire, emarginate; base of the columella contorted and 

 oblique. 



Terebra vittata. — The Filleted Terebra. Plate XI. 

 tig. 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 Lamarck. 



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, which 

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

 ing part of the left side, is a striking fcatm-e in tliis genus. 



Eburnn 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.— Zmw«>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. 



