5. Cymbulia. The Slipper. One species.

Shell or case cartilaginous, transparent, conical posteriorly where the

animal adheres, and prolonged above like a long hollow semi-cylinder,

under which the animal can take shelter.

_C. Peronii._ Peron’s Cymbulia.

Shell shaped like a shoe, somewhat gelatinous or cartilaginous, very

transparent crystalline, oblong pointed at the vertex, truncated at the

base.