DESCRIPTION OF PLATES.

PLATE 1.
BALANUS TINTINNABULUM.

• Fig. a, b, and f (upper shell), Balanus tintinnabulum,—var. communis.
• c and f (part of shell), ”””validus.
• d,””””coccopoma.
• e,””””concinnus.
• f (part of shell),”””validus.
• g,””””zebra.
• h,””””crispatus.
• i,””””spinosus.
• k,””””occator.
• l,””””d’Orbignii.