On two species of Titanosarcolites (Rudistids) from St. James' Parish, NW Jamaica

Abstract

Specimens of Titanosarcolites from St. James' Parish, NW Jamaica, are described. It is shown that in Titanosarcolites new tubes are formed by a process of subdivision of older tubes. The presence of the ligament in the right valve of Titanosarcolites giganteus is established. The internal structures of Titanosarcolites alatus (Chubb, 1967,1971) are described; the species may be intermediate between Antillocaprina and Titanosarcolites giganteus. The genus Titanosarcolites was already known from the Barettia Limestone of Sunderland.