Mr. Swainson on several rare and iindescribed Shells. 377 



5. Ampullaria reflexa. 



A. testa ]a2vi, ovato-globosa ; spira subventricosa, obtusa, sub 

 epidermide jiurpures'i ; apertura castaneo-purpurea ; labio 

 exteriore tenui, margine reflexo. 



Shell smooth, ovate-globose; spire subventricose, obtuse, be- 

 neath the epidermis purplish ; aperture chesnut purple ; 

 outer lip thm, the margin I'eflected. 

 Knorr, vol. v. pi. v. f. 2 (iincoated). 



Readily distinguished from all other species by the outer lip 

 having the margui slightly, but distinctly, reflected. 



6. Ampullaria imperforata. 



A. testa ovato-globosa, fasciis fuscis; spira levata, acuta; 



labio interiore albo ; operculo corneo ? ; umbilico caret. 

 Shell ovate-globose, with brown bands ; spire elevated, acute ; 



mner lip white ; operculum horny ? ; umbilicus none. 

 This is a small shell, in shape resembling K^i.fasciatai^ocA. 111. 

 vol. ii. pi. 103), but the spiral whorls are less convex, the 

 tip more acute, and the umbilicus entirely concealed. I do 

 not know its locality, but Mr. Mawe procured several spe- 

 cimens m Paris. 



7. Strombus duhius. 

 S. testa gracili, laevi ; spira ventricosa, apice acuto ; labii ex- 

 terioris baud dilatati parte superiore spiram versus ascen- 

 dente ; lobo basali subobsoleto. 

 Shell slender, smooth ; spire ventricose, the tip acute ; outer 

 lip not dilated, the upper part ascending on the spire ; basal 

 lobe nearly obsolete. 

 This is a small but very curious and rare shell ; but for the 

 slight lobe at the base of the outer lip, it might be taken for 

 a species of Terebelhm ,- indeed it may be said to connect 

 the two genera, though its characters approximate most to 

 the genus under which I have placed it. 

 8. Strombus Peruvianus. 

 S. testa nodosa, ponderosa ; spira depressa, apice prominulo ; 

 labii exterioris supra producti, attenuati, margine reflexo ; 

 apertura striata. 

 Shell nodulous, heavy; spire depressed, the tip prominent; 

 outer lip above produced and attenuated, the margin re- 

 flected ; aperture striated. 

 Mus. nostro. 

 A large and strikingly distinct shell, recently sent from Peru. 



9. Strombus Tankerxnllii. 

 S. testa nodose plicata ; labio interiore crasso, striate, supra 



acumiiiato; labio exteriore supra sinuato, intiis striato; 



aperturA rosea, castaneo colore intus fiicata. 

 Vol. 61. No. 801. Maij 1823. 3 B Shell 



