166 CONCHOLOGY. 



long ; plaits on the anterior part of the columellar edge ; the 

 exterior edge thin, 



FAMILY XX. 



CoNvoLUTA. Six genera. 

 1. Ovula. The Egg. 12 species. 



This is the first genus of Lamarck's arrangement of con- 

 voluted shells ; it is nearly alUed to the Cyprsea, but easily 

 distinguished from it by the want of spire, and by not having 

 teeth on the columellar lip ; the right lip is reflected inward- 

 ly, sometimes wrinkled and sometimes smooth. 



Shell oblong, convex, resembling the Cypraea in form, with 

 the two extremities of the aperture notched, and more or less 

 prolonged like a tube ; the left margin dentated. 

 Ovula oviformis. Ovula lactea. 



O. angulosa. O. carnea. 



O. verrucosa. O. triticea. 



0. hordacea. O. gibbosa. 



O. spella. O. acicularis. 



O. birostris. 0. volva. 



O. volva. The Weaver's Shuttle. PI. 34, fig. 4. 

 Species in which the right edge is not thickened or den- 

 tated, and with each extremity elongated, producing a long, 

 straight tube, which increases with age. One of the most 

 rare shells of this genus. 



O. oviformis. The egg-shaped Ovula. PI. 34, fig. 1, 



Species ovate, much inflated, ventricose in the centre, 

 very glossy and white ; right edge dentated, the tube of each 

 extremity very prominent ; interior of aperture reddish pur- 

 ple. 



O. gibbosa. The belted Ovula. PI. 34, fig. 2. 



Species gibbous, neither end dentated ; tubes little mark- 

 ed, and with the body of the shell encircled by a blunt keel. 



O. verrucosa. The warty Ovula. PI. 34, fig, 3. 



Species in which the right end is dentated, with a notch 

 and a knob p^— -=> "♦ -^".-v. pvtrpmit^r 



