479 



O. testa laevigata, ovali, albida, canalibus breviusculis ; apertura 

 aperta ; labio externo tenui, haud inflexo ; labio interno postice 

 ad canalem uniplicato, antice umbilicato, margine depresso. 



This British species, and the 0. apertum, are the only ones in 

 which the outer lip is not thickened and inflected, and which 

 would compose the genus " Simnia " of Leach. 



38. Ovulum gibbosum (pi. xcix. f. 15 to 19), Lamarck, 

 Bulla gibbosa, auct. 



0. testa oblonga, utrinque obtusa, lsevi, albida seu aurantiaco- 

 fulva, dorso in medio angulatim gibboso ; canalibus brevibus, 

 latis, antico sub-emarginato ; apertura antice aperta, labio externo 

 lsevi, crasso, in medio angulato, antice sub-emarginato; labio 

 interno lsevi, gibboso, intus sub-depresso. 



Of an oblong form, with an angular ridge in the centre of the 

 back, and the extremities obtuse. 



Collected at Panama by Mr. Cuming. 



89. Ovultjm emarginatum (pi. xcix. f. 11, 12), Sowerbg, 

 Sp. Conch. No. 1. p. 7. 



0. testa oblonga, utrinque obtusa, substriata, pallide fulva vel 

 violacea, dorso ad marginem roseo, in medio angulatim gibboso 

 canalibus brevibus, emarginatis ; apertura antice aperta, labio 

 externo lsevi, crasso, in medio angulato, ad extremitates labium 

 internum longitudine superante ; labio interno lsevi, gibboso, 

 intus sub-depresso. 



Like 0. gibbosum, but with the canals emarginated, and the 

 inner lip longer than the outer at both ends. 



Collected at St. Elena by Mr. Cuming. 



Ovultjm intermedium (pi. c. f. 61, 62), Sowerby, Sp. Conch. 

 No. 1. p. 9. 



0. testa oblonga, lsevi, in medio angulata, pallide fulva, sub- 

 tils subaurantiaco ; canalibus sub-productis, emarginatis ; apertura 

 sub -aperta ; labio externo lsevi, ad extremitates brevi, recedente ; 

 labio interno lsevi, gibbosa, postice tumorem crenulatum ferente, 

 ad canalem producta, antice ad canalem angustata, producta; 

 intus sub-depressa. 



Named 0. intermedium, on account of its forming a passage from 

 0. gibbosum, and the species with produced extremities. 



From Brazil. 



