TESTACELLA SCUTULUM, SOWERBY. 121
to the sudden protrusion from the mouth, of the buccal cartilage,
which carries the radula or lingual ribbon. The protrusible organ
is milky-white, and the ribbon, studded with rows of barbed
chitinous "teeth," follows the general spoon-shape of the supporting
cartilage. As the latter becomes completely extended, the hollow
Testacella scutulum, Sowerby—Buckhurst Hill, Essex.