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A barnacle, a rhizocephalan, and their larvae. (A) The barnacle Balanus tintinnabulum in longitudinal section. (B) Nauplius and (C) cypris larvae of Balanus sp. (D) The rhizocephalan Sacculina carcini infesting the crab Carcinus maenas. Right side of crab shown transparent to illustrate ramifications of parasite. (E) Nauplius and (F) cypris larvae of Sacculina carcini. A after Darwin (7); B, C, E, and F after Williamson (8), with permission of Brill (publishers); D after Boas (9).
