TURBO. TURBAN. 223 



77- Turbo pallidus, Pale Turban. 



Murttagn, pi. 21. f. 4. 



Shell rather slender, smooth, white, sometimes with a 

 greenish hue or covered with a rough coat : spires six or 

 seven, flatfish but well denned : aperture somewhat orbi- 

 cular, the outer-lip extremely thin, arched or much pro- 

 duced towards the pillar ; pillar-lip reflected, with a small 

 perforation behind it, and an obscure tooth-like fold in the 

 middle on the inside : length above the eighth of an inch $ 

 breadth a third of its length. 



It is difficult to specify the precise differences between 

 these three last species : but as far as \\:e understand them 

 'from specimens before us, and which are all evidently dis- 

 tiMct, the Tn bo unidentatus has the aperture exactly oval, 

 with the tooth placed on the inside in the middle ; the 

 T. plicatus has a strong fold quite across the pillar, and near 

 the base ; the T. plicatus differs from both, in the much 

 produced outer-lip and somewhat orbicular aperture, giving 

 the base of the shell a more flattened appearance. 



Western coasts, and Dublin bay. v. m. 



7B. Turbo interstinctus. Rosy-tipped Turban. 



Montagu., pi. 12. f. 10 Linn. Trans, m. pi. 13. f. 23, 24. 



oil ell taper, obtuse, glossy-white, with generally a purple 

 or rosy tinge at the tip : spires five, very little raised, but 

 divided by a fine line, and marked with fine 'longitudinal 

 ribs: aperture somewhat oval; the pillar-lip a fi tie re- 

 flected, with a small tooth : length a line ; breadth a third 

 of its length. 



Western coasts, in fine sand. v. m. 



We cannot here avoid entering our strongest protest 

 "against the arbitrary removal of these six last species into 

 the genus Yoluta, by modern compilers, in violation, as we 

 are of opinion, of that natural alliance which in all doubtful 

 'cases should be ultimately decisive. If the mere circum- 

 stance of the aperture being furnished with folds or teeth 

 be alone a characteristic, then might the whole of this di- 

 vision, and some others of a more remote family be arranged 

 as Volutes. But independently of this incident, we consider 

 it as essential to the genus Voluta, that the aperture be 

 'elongated, taking in at the least onx* half of the shell, with 



