Among the new Oolitic Crustacea to which I drew attention at the meeting of the British Association, Dundee, was a species of Prosopon from the Stonesfield Slate.

This genus was proposed by H. von Meyer, in 1835, for certain minute forms of crustacea from the Upper White Jura of Oerlinger Thal, and other localities in Germany, from whence he has described twenty-nine species, and in addition to these, one from the Lower Oolite, three from the Coral Rag, and one from the Neocomian (see Palœontographica, for December, 1860, vol. vii., p. 183, pl. xxii.)