Oval, elongated, compressed on the sides, having the summit sub-anterior, well marked, and curved; exterior fawn colour, interior of a silvery hue.

P. deaurata. The golden red Patella. Pl. [2], fig. 3.

Sub-conic, summit more anterior, with a slight forward inclination; colour yellowish red.

P. cochlear. The spoonlike Patella. Pl. [2], fig. 4.

Depressed, the summit hardly marked, and much more narrow in front than behind; exterior brownish, interior light blue.

P. scutellaris. The buckler Patella. Pl. [2], fig. 5.

Depressed, summit sub-anterior, radiated from the summit to the margin; brown colour, with a yellowish band parallel to the margin.

P. pectinata. The pectinated Patella. Pl. [2], fig. 6.

Oval, summit well marked and anteriorly inclined; ribbed from the summit to the margin, which is slightly convex in the middle.

P. cymbularia. The cymbular Patella. Pl. [2], fig. 7.