GASTEROPODA. PURPURADZ. 121 
The siphon of the shell is open, in the young state, of all 
the species of this genus. 
1. OcrInEBRA ERINACEA. 
O. anfractibus longitudinaliter lineato-elevatis ; lineis alterna- 
tim minoribus, crenato-lamellatis. 
Murex Erinaceus, Linn. Syst. Nat.i. 1216; Penn. Brit. Zool. 
iv. 123. t. 76. fig. 95; Mont. Test. Brit. i. 259; M. & R. 
Trans. Linn. Soe. viii. 142; Flem. Edinb. Encycl. vii. 71 ; 
Dill. Dese. Cat. 690 ; Turt. Conch. Dict. 87. 
Buccinum porcatum, Da Costa, 133. t. 8. fig. 7. 
Animal viridescente-griseum, aurantium aut aurantio-flavum, 
opaco-albo varium, maculatum aut punctatum. Tentacula 
pallidé rufescentia, albido-opaco varia, ad basin dilutiora. 
Oculi atri. 
Habitat in mari Britannico, preesertim in scopulosis, vulgaris. 
Whorls with longitudinally elevated lines ; the lines alter- 
nately smaller, with wrinkled lamelle. Height two inches. 
This very common species occurs on most of our rocky 
coasts, and in a young state is more frequently taken by dred- 
ging in deep water. 
Colour of the shell dirty-white or pale-brown. When worn, 
they are often mottled with rusty-brown, croceous, and white. 
Animal greenish-grey, orange or orange-yellow, varied, spot- 
ted, or freckled with opake-white. Tentacula pale-reddish, 
varied with opake-whitish, their bases paler. The eyes pure 
black. 
STIRPS III. 
The shells of the genera, which compose this Stirps, have a 
more or less elevated spire, which is never turrited. The left 
side of the aperture is produced into an open siphon, very vari- 
able in length. Umbilicus closed. 
