This genus is taken from the Mytilus, and, like the Pholas, possesses
the faculty of penetrating calcareous rocks, from which it cannot be
extracted without breaking the substance in which it is imbedded.
Shell bivalve, thick, covered with epidermis, rather irregular,
elongated, sub-cylindrical, obtuse at the two extremities; summits
little marked; hinge toothless, or with a very small rudimentary tooth;
ligament external, a little inflated.
Saxicava rugosa.
S. Gallicana.
S. pholadis.
S. Australis.
S. veneriformis.
_S. Australis._ The Australian Saxicava. Pl. 7, fig. 6.
Answers to the above description.
_S. Gallicana._ The Gallic Saxicava.
Oblong, wrinkled, truncated at the posterior extremity, one valve larger
than the other; pale horn colour.