Turbo Margarita and carneus. 107 



f. 3. a. b. J but that shell is at once distinguished by its very small 

 perforation which is not completed by the beak of the upper 

 valve. 



Turbo, Lamarck. 



9. Turbo margarita. 



T. testa laeviuscula, umbilicata, nitida; sub lente striis circu- 

 laribus tenuissimis obsoletis ; spira brevi, apice obtuso. 



Icon. Tab. nost. V. f. 10 & 11. Aucta, fig. 11. b. Laskey 

 in Wern. Trans. I. pi. 8. f. 5. (Helix margarita.) 



Mont. Suppl. p. 147. Turton's Conch. Diet. p. 229. 



Shell rather strong, semi-transparent, subglobular; beneath flat- 

 tish, umbilicated; with four convex, rounded volutions. Spire 

 short, moderately produced ; the extreme apex depressed, flat- 

 tened, obtuse. Body volution beneath convex, rounded. To the 

 naked eye the shell appears perfectly smooth and shining, but 

 through the lens it is found to be marked with very faint, regular, 

 circular, depressed ( ?) striae, which are more perceptible on the 

 under side. Aperture round, a little angular at the upper part 

 and slightly attached to the last volution, so that the shell does 

 not appear to have any true columella as in the common Paludina 

 vwipara, tentaculata and many other shells. Umbilicus moderately 

 large, open, deep. Operculum horny, rounded. Margin of the 

 outer lip simple, entire. Colour a sort of livid bronze, or reddish 

 slate-colour, darker towards the apex. Aperture silvery within. 

 The whole shell in some lights reflects metallic colours. 



At Gallanch, three miles south of Oban, rare. At Appin plen- 

 tifully amongst loose rocks, uncovered at spring tides. 



Though my specimens diff'er in a few immaterial points from the 

 descriptions in Montagu and Turton, there can be little doubt they 

 belong to this species, first imperfectly figured by Laskey in the 

 Wernerian Transactions. None of my specimens have the faint 

 brown band mentioned by Turton. I have introduced the de- 

 scription of this little known species for the sake of companion 

 with the following. 



10. Turbo carneus. 



T. testa subconica umbilicata, striis elevatis regularibus sub- 

 distautibus ciactaj spira brevi, apice elevato acuto. 



