Seven new species of Thala are described: T. abelai and T. merrilli (type locality Guam, Mariana Islands), T. evelynae and T. suduirauti (Philippines), T. kilburni and T. pallida (Bassas da India Reef, Mozambique Channel) and T. ruggeriae (Tanzania) and their geographic ranges established. Lectotypes are selected for T. exilis (Reeve, 1845), T. roseata (A. Adams, 1855), T. fusus (Souverbie, 1876), and T. ogasawarana Pilsbry, 1904, and T. fusus is synonymized with T. mirifica (Reeve, 1845). The range of T. lillicoi Rosenberg & Salisbury, 2007 is extended to Kwajalein from Hawaii. Live animals of six species are illustrated. Microsculpture of 14 species is illustrated with scanning electron microscopy.