234 
Dr. Maton’s and Mr. RAckErTT's 
Davil. t. 1. p. 428. 
Da Costa Brit. Conch. p. T. t. 1. f. 5. 
Chemn. Conch. 10. t. 168. f. 1620. 
Pulteney in Hutch. Dorset. p. 51. t. 23. f. 5. 
Teste seniores. Linn. Syst. Nat. n. 159. p. 1259. Linn. Gmel. 
* 
10. 
à Jo 
AUS 
$^ 
p. 9697. P. cerulea? 
Lister Anim. Angl. App. t. 2. f. 10. 
Conch. t. 542. f. 26. 
Petiver Gaz. t. 75. Fh. 
- Borlase Corn. t. 28. f. 2. 
— Pennant Brit. Zool. t. 90. f. 151. 
Da Costa Brit. Conch. t. 1. f. 6. 
Chemn. Conch. 10. t. 168. f. 1621. 
Pulteney in Hutch. Dorset. p. 51. t. 23. f. 6. 
Donovan Brit. Shells, t. 3. f. 1. 
Montagu Test. Brit. f acl 
Habitat in mari. 
Fa ta interdum. diametro 4 aN sal. colore flavescente-brunneo, nunc _ 
s conica, nunc depressa, radiis cæruleis obsoletis. Mucro obtusior, de- 
corticatus. 
First figured and described by Lister. | Common on 
the Western coast, and among the Western Isles of 
Scotland. — . 
This shell, so different in shape and appearance un- 
der various stages of growth, has been commonly sepa- 
rated into two or more species. Dr. Pulteney always 
maintained a contrary opinion; and it appears from 
the observations of Mr. Montagu, that the gradations 
are so regular, that no permanent ne distinction is 
to be established. | 
CUP bicis Co 
È nDe 
virginea. P, testa" integerrima,  oblongo-orbieulari, snbstrista: 
sie verticis 
