467 



MONOGRAPH OF THE GENUS 

 OVULUM. 



Char, Gen. Molluscum Tracheliopodum marinum. Testa con- 

 voluta, ovalis vel fusiformis, spira cselata ; apertura bicanalifera, 

 columella Igevi. Operculum nullum. 



The spire is enclosed by the last whorl. The aperture has a 

 canal at each end. The columella is smooth. The mantle of the 

 animal covers a considerable portion of the shell. 



OvuLUM Ovum (pi. xcix. f. 1, 1, 3), Bulla Ovum, Auctorum. 

 Ovula oviformis. Lam, Anim. s. vert. vii. p. 366. 



0. testa ovah, polita, alba ; canalibus brevibus, ad extremitates 

 emarginatis : apertura antice sub-aperta, sanguinea ; labio externo 

 intiis crenulato, antice breviusculo, labio interno postice tumido, 

 antice subtortuoso, emarginato, ad canalem posticum angustato 

 sub-spiraU, ad canalem anticum crasso rectiusculo. 



Oval, polished, white, with short ends ; the aperture widened 

 at the lower part, inside of a brownish red colour ; outer lip cre- 

 nulated witliin, shortened at the lower end; inner hp with a 

 rounded elevation on the upper part of the body, whorl, at the 

 posterior canal narrowed, and then sub-spiral; at the anterior 

 canal tliickened and rather straight. 



Found in the Indian Ocean, and in the Society and PhiHppine 

 Islands. 



2. OvuLUM ANGULOSUM (pi. xcix. f. 4. 5), Law,. Anim. s. 

 vert. vii. p. 367. 0. costellata. Lam. Ann. du Mus. xvi. p. 110. 

 Bulla imperialis, Dillwyn. 



O. testa ventricosa, subangulata, Isevi, alba ; dorso tumido, 

 anguloso ; obscure costellato ; canalibus brevibus, antica ad extre- 

 mitatem emarginata ; apertura angusta, intiis violacea ; labio ex- 



