ON THE STRUCTURE OF THE SHELLS AND PEARLS OF TRIDACNA SQUAMOSA LAM. AND HIPPOPUS HIPPOPUS (LINN.) BY A. REYNE I. Introduction The Tridacnidae have already drawn the attention of the first naturalists on account of their huge size; Tridacna gigas Lam. (T. derasa Iredale), the largest of the recent Bivalva, belongs to this family. Though the principal species, which are widely distributed in the Indo-Pacific, were described about 250 years ago, there is yet little known of their structure and mode of life, as was pointed out by VAILLANT (1865) and YONGE (1936). The morphology was studied by Quov and GAIMARD (1835), VAIL- LANT (1865), GROBBEN (1898), LACAZE-DUTHIERS (1902), PEL- SENEER (I9I I) and others. HEDLEY (1921) published a revision of the Australian Tridacnidae. YONGE (1936) studied the mode of life, feeding, digestion and symbiosis with zooxanthellae. A detailed description of the pearl-like concretions in Tridacna- and Hippopus-shells was given by RUMPHIUS (1705). He found them frequently in the muscles. It was only in the beginning of the present century that muscle-pearls were again described (HERDMAN I go3, RUBBEL 1912, JAMESON 1912). According to RUMPHIUS Tridacna-pearls are often very similar to the so-called coconut-pearls which are said to
Archives Néerlandaises de Zoologie (in 1967 continued as Netherlands Journal of Zoology) – Brill
Published: Jan 1, 1951
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