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“ This Rostellaria was figured and described by the late Mr. Sowerby as R. Parkinsoni of the Geol. of Sussex ; it is, 
however, perfectly distinct, and it becomes necessary to adopt a different specific name ; that of Sowerbii is here given as a 
tribute of respect to the present scientific editor of the Mineral Conchology of Great Britain. The R. Sowerbii occurs in the 
tertiary formations only ; R. Parkinsoni in the chalk marl and Shanklin sand. 
