MOLLUSCA. 21 



tranquilly along the bright sandy bottom. The spots on the mantle are much smaller and more irregular 

 in form than those on the foot. The head is pure opaque white, with the exception of one large black 

 spot placed in the centre of the fore-part, which, with its large black eyes and black-tipped tentacles, gives 

 it a very peculiar appearance. A.A. 



3. Ovulum acuminatum. PI. VI. Fig. 1 a, b. Ovul. testa subovali, in medio sub-ventricosa, ad extre- 

 mitates sub-rostata, Levi, alba, longitudinaliter fasciata ; dorso margine distincto; canalibus ad dorsum elevatis; 

 labio externo crasso, kevi, ad extremitates recedente, antice sub-angulato, ad canalem emarginato ; labio 

 interno tumido, intus unicariuato, postice spiraliter uniphcato, ad canales rectiusculo. 



Hab. The east coast of Bilaton. 



'Differing from 0. secale in being proportionately ventricose in the middle, and having 

 the extremities turned upwards at the back. 



4. Ovulum coaectatum. PL VI. Kg. 2 a, b. Ovul. testa elongata, sub-cylindracea, fulva, striata, supra 

 medium gibbosa, ad extremitates coarctata, labio externo paululum incrassato, lsevi, antice sub-angulato ; 

 labio interno intus sub-depresso, ad extremitates acuminato. 



Hab. Straits of Sunda, near Java. 



This shell resembles 0. hordacea in some degree, but is not angular, and has the outer 

 lip smooth. It may, however, very possibly be a young shell. 



5. Ovulum recuuvum. PL VI. Pig. 3 a, b, c. Ovul. testa elongata, medio ventricosa, sub-angulata ; 

 laevigata, ad extremitates attenuata, recurva ; labio externo crasso, antice angulatim arcuato, ad extremitates 

 truncato ; labio interno in medio ventricoso, ad extremitates attenuato, recurvo. 



Hab. China Seas. 



The' canals are not so much attenuated as in 0. longirostrum, and the outer lip is more 

 suddenly narrowed into the anterior canal. It is thick, and pressed closely against the body 

 whorl at the upper part, so as to leave the aperture very narrow. The shell is almost white, 

 slightly tinged with pale buff. 



6. Ovulum dentatum. PL VI. Fig. 4 a, b. Ovul. testa parva, oblonga, sub-angulata, minute striata ; 

 pallide rosea, fusco rubescente variegata ; canalibus sub-productis, emarginatis ; apertura angustata ; labio 

 externo breviusculo, complanato, intus et ad extremitates usque ad marginem dentato ; labio interno lsevi, 

 intus longitudinaliter sulcata, postice tumorem elevatum crenulatum ferente, ad canalem recedente ; antice 

 angustato, tumido ; ad canalem sub-uniplicato. 



Hab. Caramata Passage, near Singapore. 



Not so angular as 0. striatulum. The teeth of the outer lip extend to the outer margin 

 at the upper extremity where they form denticulations. The colour is pale rose, strengthened 

 at the ends with two longitudinal waved bands at the back. 



7. Ovulum bulla. PL VI. Eig. 5 a, b. Ovul. testa ventricosa, subcylindracea, lsevi, antice sub - 

 acuminata ; canalibus brevissirnis integris ; labio externo in medio sub-rotundo, intus crenulato ; labio 

 interno postice tumorem parvum ferente, ad canalem angustato, uniphcato, intus paululum excavato. 



Hab. China Seas. 



G 



