Vol 5 - Dumfriesshire & Galloway Natural History and Antiquarian ...

52 Transactions.three feet square, sloping oflF east and west from a central ridge,saddle-like, is covered as closely and intricately as possible withdesigns of a similar type to those shown on PI. III., of which)indeed, it forms a portion. Several square feet to the east ofthis sculptured " saddle " are also very elaborately carved withwhat seeln, at first glance, to be fresh designs, in which groovesstraight and partly angular are more conspicuous than I'ings.There are also many small groupings of cups in threes and fives,some with grooves, others simple. The chief peculiarity in theportion shown in my diagram (Fig. 3, PI. VII.) lies in the wholeinner surface of the ring marked A being hollowed out to a levelbelow the actual level of the suri'ouuding rock. This ring is teninches wide, and the adjoining circle eleven inches.III. The Graptolites of the Moffat District.By Mr James Daieon,F.G.S.It may be remembered that the specimens which I exhibitedbefore this Society on the last occasion were, with few exceptions^principally the simpler forms belonging to the genera Monograptusand Diployraptus. To-night, I shall bring forward a few of themore complex kinds, also found in the lower Silurian or upperLlandeilo rocks of the south of Scotland from the locality ofMofiiit. Although these ancient Zoophytes have not a widerange in the earth's crust, being exclusively confined to theSilurian system, yet, geographically speaking, they are found invarious countries of the globe, indeed wherever these rocks exist.I shall again briefly describe their structure, and with theassistanceof this model, the accompanying drawings, and specimenswhich are on the table, those of you who are unfamiliar with thesubject will, I trust, be able to follow me as I proceed in theenumeratio]! of the diflerent species. «AVe shall now notice Monograptus Sedgwickii.—There is nomay be stated, that assumes so many diff'erent formsGi-aptolite, itand variations of form as this species.Many of these differences,I have no doubt, may arise from their state of preservation, theirage, or their sex. There are two or three varieties, which appearto be distinct enough to be entitled to distinct names. Thegeneral form of M. Sedgwickii, as described by Portlock andfigured by M'Coy, consists of a simple Monoprionidian stipe of