Mr. E. J. Wayland, of the Geological Survey of Uganda, has recently found three interesting fossils which throw further light on the age of the beds to the west and north of Mombasa. One of them is a cast of an ammonite in brown ironstone, which has been kindly examined by Dr. L. F. Spath; he says that being only a cast its specific identification is perhaps impossible. It is a Grossouvria, and he says it is very similar to several examples of G. lateralis (Waagen), from the Callovian anceps beds of Kachh. He identifies it as certainly a member of Siemiradzki's form-series of Perisphinctes balinensis, Neumayr. This identification is of interest as the fossil was obtained at the point 10/6 miles from Mombasa on the Uganda Railway. This position lies to the west of, and therefore at a lower horizon than, the ammonite-bearing shales near Mombasa. At 11 1/9 miles along the railway I found a lamellibranch in some dark shales and Dacqué (Geol. Rundsch., vol. i, 1910, p. 159) has recorded from near by some obscure Cephalopod and plant remains which he identified as Bathonian.