The distribution of the family Littorinidae in mangroves and on rocky shores in Thailand was studied, Fourteen species of Lilloraria, Eehino!lltorina and Peaslella were recorded from 50 survey sites, bringing the total known for the country to 16 species. Two species were recorded for the first time in Thailand Ul10rarza eO/liea was found in only two places in southern Thailand, both on the Andaman Sea, Eehinolitlorina feejeensis occurred on scattered granite rocks on sandy beaches in the splash zone of offshore islands where the water is clear both in the Gulf of Thailand and the Andaman Sea. It is dominant at Ko Kumpun, Trat Province, Habitats occupied by the three genera are distinct. Eehinolil1orina and Peasiella occur primarily on intertidal rocks though occasional individuals are found in the seaward fringe of mangroves; Uttorana Illldulata occupies a similar rock habitat. The other species of Lllloraria occur on many species of mangroves, with some occasionally being found on rocks. Four species (L bengalensis, L coniea, L seabra, and L. undlllata) occurred only on the Andaman Sea side of Thailand.
The pallial organs of Haliotis asinina are composed of gills, osphradium, hypobranchial gland, kidney and heart. The bipectinate paired gills are on the left and right sides of the mantle cavity. The gill epithelium is composed of ciliated columnar cells and occasional mucous cells. The paired osphradia are long, slender and lie anteriorly on each side of the mantle near the gills. The ciliated sensory epithelial cells are very tall and closely packed. The paired hypobranchial glands are fused and lie along almost the entire length of the mantle. The left hypobranchial gland is more prominent than the right one. They are composed of mucous gland cells. The paired kidneys are at the postero-dorsal part of the mantle and lie anteriorly to the heart. The right kidney contains tubulo-asini with light squamous or cuboidal epithelial cells. The left kidney contains densely packed irregular cuboidal epithelial cells. The heart is at the posterior end of the mantle connecting to the gills and is composed of one ventricle and two auricles. The wall of the auricles contains strands of muscle and fibrous tissue whereas the ventricle has thick muscular walls.
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