Mr. Mansel-Pleydell's Memoir on the Geology of Dorset, contained in the last two Numbers of this Journal (pp. 402 and 438), refers to a theory of the formation of the Fleet proposed by Messrs. Bristow and Whitaker in 1869 (Geol. Mag. Vol. VI. p. 433).

The nine specimens of Phyllopodous Crustacea about to be noticed are, with one exception (that from Lanarkshire), all from the undoubted Carboniferous Limestone series, East Kilbride, a locality already well known to local geologists as having yielded a very rich series of Carboniferous forms.

Some time since, I read before the Geological Society of Glasgow a paper on “The Valley of Loch Lomond,” and pointed out that the deeps and shallows corresponded with, the faults and breaks in the adjoining country. This paper was quoted by His Grace the Duke of Argyll, President of the London Geological Society, in opposition to the view (so ably advocated by Professor Ramsay) that ice has been the principal, if not the only, agent engaged in the formation of such hollows.

Two remarkable geological features present themselves in this little valley: one, the occurrence of the Upper Coal Measures of Bewdley, together with the well-known Spirorbis Limestone; the other, that of the Bone-bed, succeeded by the no less interesting Passage-beds, forming connecting links between the Old Red, Sandstone and Upper Ludlow Limestone. The order in which these occur, taking both banks of the brook, appears to be this.

In the following communication I intend to give a very brief outline of some of the chief results of my investigations among British Graptolites in those departments of inquiry which are more especially connected with consideratious of classification. I shall content myself with offering a concise statement of the main conclusions at which I have arrived, reserving all detail to the future, when I hope to adduce decisive evidence in support of the views here advanced. The special subjects to be noticed in this place are—the development, structure, classification, and geological distribution of that section of the Rhabdo-phora in which the complete polypary can be proved to be composed of one or more polyparies essentially similar to that in the unilateral and uniserial forms to which the name Graptolites (Graptolithus) is commonly applied. Those Rhabdophora supposed to be similar in structure to the genus Retiolites will be considered in conjunction, but no pretension is made to anything like the same certainty in this section.

We have already noticed that Barrande, as early as 1852, gave the name of Primordial Silurian to the rocks which, in Bohemia, were marked by the first fauna; although he, at the same time, recognized this as distinct from and older than the second fauna, discovered in the Llandeilo rocks, which Murchison had declared to represent the dawn of organic life.