Pleurotomaria sp. gastropod mollusc collected from the Jurassic Great Oolite deposits of Langton Herring in Dorset. Pleurotomaria is an extinct genus of gastropod which belongs to the family Pleurotomariidae; one of the oldest families of gastropod, commencing in the Cambrian. Modern species live in deep waters, 2000 - 3000 m depth on the sea floor feeding on sponges and octocorals; information like this helps us establish the mode of life for these ancient fossil examples. These specimens measure between 1 and 2 cm in total shell diameter. They exhibit the characteristic trochoidal shape however some specimens may have some matrix or cement attached thus detail may suffer slightly. Supplied in a small plastic bag with an information label.