EXOTIC CONCIIOLOGY. 15 



and the body-whorl, which is not very sharp, is produced somewhat beyond it, 

 exposing a rounded excavated area, deeper but much more contracted than that of 

 Porcina. Pillar with three plaits. Size four inches. Habitat ? 



In younger individuals the subconical apex, together with the spire, is exposed ; 

 and the upper edge of the border of the body-whorl, which is sharper than it is 

 in old specimens, does not project beyond them : neither does the enamel-like 

 glaze, which in this stage of growth is thin and silvery, cover more than two-thirds 

 of the shell. 



V. PORCINA. KEEL-MARGINED MELON. 



Plate XXV. 



Testa subcylindrica, pallid^ fusca : anfractAs basalis limbo apicem subobsoletum vix supe- 



eminente, patulo tantum non piano, subcariuato : columella bipUcata. Apex in 



junioribus exsertus. 

 F. Porcina, Lam. Anx. sans V. 7. p. 334. no. 12. Dilwyn, p. 577. no. 182. Adanson, 



3, fig. 2. Seba, 3. tab. 65, fig. 5, 6. tab. (56. fig. 5. Mart. 3. tab. 70. fig. 764. 



Enc. Met. 386. 2. Wood's Cat. Volutse, no. 179. Brod. Cymba, fig. 6. Kiener, 



Volutse, pi. 12. Sow. Cone. Man. fig. 434. 



Shell subcylindrical, whiteish, covered with a thin ash-coloured epidermis, 

 which is coated by a silvery enamel-like pellicle extending over about two-thirds of 

 the shell. The apex is more visible than in V. Proboscidalis, but the spire is en- 

 tirely concealed, the upper border of the body-whorl is less reflected than in that 

 shell and the ai'ea though very open is less excavated ; its size also is very inferior. 

 In fine specimens the aperture is of a rich brown. Pillar with two plaits. Senegal. 

 Length five inches and a half. 



MURICIFORM TYPE. 



V. MARMORATA. MARBLED VOLUTE. 



Plate I. 

 Testa ovato-oblonga, subventricosa, coronata : carneola, lineis fulvis longitudinalibus 



angulato-flexuosis ornata : spira brevi, spinis brevibus muricata, apice autem conico, 



Isevi : columella 4 plicata. 

 Kieuer, Volutse, pi. 26. Wood's Cat. Sup. Volute, fig. 20. 



Shell ovate-oblong, subventricose with a short and conical spire, composed of 

 eight subcarinated whorls roughened near their base by a range of short but sharp- 

 pointed tubercles. The body-whorl which is attenuated towards its lower extremity 



