479 



0. testa leevigata, ovali, albida^ canalibus breviusculis ; aperturu 

 aperta ; labio externo teuui, hand inflexo ; labio interno postice 

 ad canalem uniplicato, antice umbilicato, margine depresso. 



Tliis British species, and tlie 0. apertiim, are the only ones in 

 wliich 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, 

 BuUa gibbosa, auct. 



O. testa oblonga, utrinque obtusa, Isevi, albida seu aurantiaco- 

 fulva, dorso in medio angulatim gibboso ; canalibus brevibus, 

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

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

 interno Isevi, gibboso, intiis 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. 



39. OvuLTJM EMAHGiNATUM (pi. xcix. f. 11, 12), Sowerbi/, 

 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 \dd\i, crasso, in medio angulato, ad extremitates labium 

 internum longitudine superante ; labio interno Isevi, gibboso, 

 intiis 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. 



OvuLUM INTERMEDIUM (pi. c. f. 61, 62), Sowerhy, Sp. Conch. 

 No. 1. p. 9. 



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

 tiis subaurantiaco ; canahbus sub-productis, emarginatis ; apertura 

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

 labio interno Isevi, 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. 



