The object of the following paper is to record some further observations on the distribution in North Wales of deposits of White Clays and Sands older than the Boulder-clay and its accompanying gravel drifts, similar to those in the neighbourhood of Llandudno, described in the Geological Magazine of May, 1865, and also to give a condensed summary of what records I have been able to collect of the occurrence of similar deposits in other parts of the kingdom.

At the meeting of the British Association held in Birmingham in 1865, Dr. Voelker directed attention to the discovery of a bed of Phosphate of Lime in North Wales, and entered into particulars concerning its chemical composition, and economical value. same thickness and relationship to the adjoining beds. We thus infer that it was deposited in a somewhat shallow sea, not much varying in depth, or subjected to disturbing influences. The strata in which it occurs are rightly marked upon the government maps as “reversed,” dipping, as they do, away from instead of towards the adjacent Llandovery and Wenlock beds.

Spirifer cuspidatus.—As I am somewhat committed to the opinion lately enunciated by Mr. Meek, that this species is characterized with a canal-system, I may be permitted to make a few observations on the subject.

The Graptolite which I am about to consider is perhaps one of the most remarkable of all our known British forms, and was originally described by Mr. W. Carruthers, under the name of Cladograpsus linearis. The genus Cladograpsus is one which was proposed by Geinitz to include certain forms of Didymograpsus; but Mr. Carruthers seems subsequently to have seen that the reference of G. linearis to this genus was inappropriate, as he has recently alluded to it, under the title of Dendrograpsus linearis.