of the Kaitat, Later on are seen the fossil beds and at their contact with the Creonior the li is recline with the Produeti. The fauna appears to be common to the entire Kaitat but far more common below than above. The Kaitat is an arenaceous limestone, in which the exceedingly fine sand makes up the greater amount. It is thick bedded and on Kale grey, and if a yellowish-white. Ita in first practice, but only white on larded surfaces. The forms as a rule are siliceous and the formation abounds in emetic may flints, they occur out singly or in beds, and the emetic is more common upwards. The Kaitat fauna is essentially one of large Products are few of which have pronounced central Sinuses. Piriisi is the largest and most common one. Then occurs rarely Chickelleri, the four species described by Dentury. A sponge is very common. There is also a small glabrose Com- posita. Archaeocidarina spines and plates are also often seen; the of this are of minute. There is a very large Aric- culoseptem, and Helicer described by Dentury. I saw one or other kind of forms. The highest Kaitat seen is a dark arenaceous li derived of forms, and abounds in small diagenetic cavities, filled with iron pyrite. On the Kaitat comes the common vesicular late