TRACHELIPODA. 67 



Terebellum subulatum. — The Awl- Shaped Terebellum. 

 Plate XL fig. 4. Shell cylindrical, thin, and glossy ; spire 

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

 long. Inhabits the Indian seas. 



Genus 5 — CYP R^ A.— Linnceus. 



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

 margins involute ; aperture longitudinal, narrow^ dentate on both 

 sides, effuse at the extremities ; spire very small, generally hid- 

 den in the perfect shells. 



Cyprcea exanthema. — The Measley Cypr^a. Plate XL 

 fig. 8. Oblong-ovate, brown, thickly studded vi^ith round eye- 

 like vi'hite 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 left margin without teeth. 



*Right side thickened, or wrinkled.-**Right side smooth and without teeth. 



The shells of this genus are distinguished from the Cypraea by the want of 

 a spire, and the left or columella 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, extremely white ; extremities prominent ; mouth orange 

 within. Four inches long. Inhabits the Indian seas, 



FAMILY II. COLUMELLARIA. 



Without a canal at the base of the aperture, but having a sub- 

 dorsal more or less distinct notch, and with folds or plaits on 

 the columella. 



Genus 7.— YOLVARI A.— Lamarck. 

 Generic Character. — Shell cylindrical, convolute; the spire 

 hardly protruding ; aperture narrow, nearly the whole length of 

 the shell ; columella with one or more folds near its base. 



This genus forms a natural connection betwixt shells which have a col. 

 iimella, and those which are cylindrically rolled or evolved upon their owo 

 axis. 



Volvaria cylindrica — The Cylindric Volvaria. Plate XL 



