78 IRACHELIPODA. 



Plate XI. fig. 3. Shell chestnut-brown, with white bands 

 above ; varix of the columella reddish, and somewhat stri- 

 ated. One inch long. Inhabits Trincomalee. 



Genus 4— TEUEBEhLJIM.— Lamarck. 



Generic Character. — Shell convolute, sub-cylindrical ; 

 apex pointed ; aperture longitudinal, narrow above ; base 

 emarginate ; columella smooth, truncated beneath. 



Terebellum suhulatum. — The Awl-shaped Terebel- 

 LUM. Plate XI. fig. 4. Shell cylindrical, thin, and glossy ; 

 spire subulate ; columella smooth, truncate at the base. One 

 inch long. Inhabits the Indian seas. 



Genus 5.— CYPR^A Linnceus. 



Generic Character. — Shell ovate or oblong-ovate, convex ; 

 margins involute; aperture longitudinal, nari'ow, dentate on 

 both sides, effuse at both extremities ; spire very small, 

 generally hidden or covered in the perfect shells. 



Ci/prcea Exanthema. — The Measley Cypr^a. Plate 

 XI. fig. 8. Oblong-ovate, brown, thickly studded with 

 round eye-like white spots ; dorsal line greyish ; marginal 

 teeth dark brown. Four inches long. Inhabits the West 

 Indies. 



Genus 6 — OVULA. — Bruguiere. 



Generic Character. — Shell turgid, attenuated at both 

 ends; margins convolute; aperture longitudinal, narrow, 

 effuse at the extremities; the inner or columellar margin 

 without teeth. 



*Outer lip thickened, or wiinkled.—** Outer lip smooth and without 

 teeth. 



The shells of this genus are distinguished from Cj-prsea by the want 

 of a spire, and the columeUar lip never having plaits or teeth. 



Ovula oviformis. — The Egg-shaped Ovula. Plate 

 XL fig. 5. Shell ovate, much inflated, ventricose in the 

 centre, very glossy, pure white ; extremities prominent ; 



