This is the first published catalogue of cnidarian type material lodged in the Western Australian Museum of Natural Science. Fifty cnidarian species of the classes Hydrozoa and Anthozoa are represented in the type collection. The earliest cnidarian species described in this collection date from 1910 when alcyonacean material from the Hamburg South-Western Australian Research Expedition was published. Information is presented here on the registration and collection details of the specimens, and habitat information is given where available.