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

—resemblance56 Trcmsactions.centre, continuing beyond the distal extremity. To this stipeare attached, at an angle of 30 degrees, the cellules, which arebeautifully ornamented with a kind of lace or netwoi-k placedaround them from the outer margin to about half way on eachside of the solid axis ; the other two halves on the two sides ofthe stipe being filled in witli a kind of hairy, irregular network.The cells at the outer edge are of a finely rounded or convexshape, numbering about 26 to an inch, and are alternate onopposite sides of the frond, while they gradually diminish fromthree-quarters of its length to a lancet-shaped point. I thinkthere can be no doubt that there was a chitinouscovering overthe fine hairy netting for protection that has been worn away. 'Locality—Hartfell and Dobb's Linn.Genus Dicranograptus (Hall), species ramosus.—The polyperytowards the proximal point has a double row of cells, but dividesor bifurcates at a certain length up into two monoprionidianbranches on the outside only, or the polypery keeps the sameline as commenced at the proximal points, and has two smalllateral spines at each side of a minute radical. The structure ofDicranograptus ramosus (Hall) resembles the form of Diplograptusfor so far up, but the hydrothecce appear to have the same formand structure as ClimacoyrajJtus. The branching off" of the twoarms at a certain distance up make it easily distinguishable fromthe other allied forms Di2)loyraptus and Clhnacograptus. Thegenus Dicraoiograptus, as far as known, is entirely confined tothe upper Llandeilo rocks of Britain at present, but it is foundin the Cardaoc rocks in North America.Locality—Hartfell andDobb's Linn.Genus Pleurograjytus (Prov.)—Tliis large and rather remarkableGraptolite which we now take up is one of the branching forms,and is, perhaps, one of the most curious of any of our Britishforms, and seems to have some small •to .the Fleurograptus,as figured by Mr Carruthers, or nearly related thereto.Mr Carruthers had first given it the name of Cladograptis linearis.The Generic name is oae that was proposed by Genitz, but MrCarruthers, not seeing it to be appropriate, then changed it toDendrograptus linearis. It is now recognised as Pleurograptuslinearis. The frond is composed of two long serrated branchesspringing from a radical or initial point, and gives off branchesat certain distances and mostly at right angles to the main stems.I have specimens with a third re-branching process given off.