P. pectinata.

P. saccata.

P. varicosa.

P. dolabrata.

P. ingens.

P. vexillum.

P. nigrina.

P. squamosa. The scaly Pinna.

Species very close and rounded at the posterior extremity; valves convex, covered with vaulted imbricated scales.

P. flabellum. The fan Pinna. Pl. [13], fig. 2.