There are eight specimens (a 314) to which Salter gave this name. All are from the Wenlock Limestone of Dudley, and belong to the Fletcher Collection. Only one shows any part of the upper surface.

The species Nautilus robustus was founded by Dr. Foord and myself upon three examples in the British Museum collection, bearing respectively the register numbers 37,010, 37,005, and C. 1,944.

Among extra-European fossil floras, none is perhaps better known than that of the Permo-Carboniferous rocks of the Southern Hemisphere. These rocks are extensively developed in Southern India, Australia, South Africa, and South America, and there can be little doubt that these regions once formed part of a great continent, to which the name Gondwana-land has been appropriately applied.

In recently completing, in the valley of St. Girons, and with the cordial assistance of M. Caralp, a pedestrian exploration of the Pyrenees, of which the first results appeared in the Bull. Soc. Ramond of 1866, it occurred to me that my view of the recently published Compte Rendu and the Livret Guide of the Geological Congress might be useful to foreign geologists.

It is remarkable, considering the enormous development of igneous rocks in South Africa, that so little has been written concerning the features they present in the field or under the microscope. Right away from Cape Town into the tropics, plutonic masses, dykes, and lava-flows interrupt the continuity of the sedimentary deposits with astonishing frequency. Some of these rocks, like the Cape Town granite and dolerite, are probably of pre-Silurian age; others, like the Kimberley lavas, were erupted during the Secondary period: while others, again, like the dykes and lavas of the Zambesi Valley, are probably of late Tertiary or even geologically recent date, as evidenced by the numerous geysers and hot springs which represent the final phase of not long antecedent volcanic activity. They appear to bear the same relation to the volcanoes of Central Africa as the British Tertiary lavas do to those of Iceland.

In the Quarterly Journal of the Geological Society, May, 1902, vol. lviii, p. 207, Mr. A. Strahan has a paper on the “Origin of the River-System of South Wales, and its Connection with that of the Severn and Thames.” It is with the part of the paper expressed in the latter portion of the title that I am more particularly concerned; for in that connection Mr. Strahan remarks in a footnote (p. 219), “The theories put forward by Mr. S. S. Buckman in Proc. Cotteswold Nat. Field Club, vol. xiii (1900), p. 175, following the lead of Professor W. M. Davis, appear to me to transgress the limits of legitimate speculation.” It seems rather curious that in a paper like this there is no further reference to the work done by Professor Davis, no attempt to consider his views, only a dismissal of them, implied in the rejection of the views which I have advanced in accordance with his teaching, which views, by the way, I gave in more detail in Natural Science, April, 1899, vol. xiv.

It is generally supposed that the crystalline limestones which occur amongst the schists, associated with orthogneisses, in various parts of the world, are altered sedimentary limestones whose accessory minerals and crystalline structure have been developed by simple contact and dynamo-metamorphism; and no doubt many crystalline limestones are of sedimentary origin, and owe their peculiarities to these agencies. In other cases the peculiar mode of occurrence of such rocks or their manner of association with igneous rocks (orthogneisses or nepheline-syenites) has led to the suggestion of other theories.

Addendum.—In Mrs. M. M. Ogilvie Gordon's paper “On Monzoni and Upper Fassa,” which appeared in the July number of this Magazine, the four names of places marked by arrows above the transverse section given on p. 310 were accidentally omitted by us, which we greatly regret. The section with the names inserted is repeated below.—Edit. Geol. Mag.