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

Transactions. 53considerable length. The breadth of the adult portion of thestipe from the solid axis to the cell mouth is from one to twolines. The axis is capillary, the common canal is broad, sometimesattaining a width of .^V^li of an inch. The cellules arelong, slender, and pointed, their superior margins slightly convex,and having a general direction at right angles to the axis ;theirinferior margin more extensively curved, the inner or liasal portionbeing sharply inclined to the axis, while the outer half isnearly horizontal.Each cellule is of a triangular shape, the baseresting on the common canal, the cell apertures being at theapex. The cellules are separate, from 20 to 24 in the inch, theirgeneral inclination being slightly upwards, nearly at right anglesto the axis.Locality—Dobb's Linn, Garpel Glen, &c.Monograptus Sedgivickii, var. triangidatus.—This is a wellmarked variety of M. Sedgivickii, and not a distinct species. Thestipe is simple and moniprionidian, and is more or less curved)beginning with a small radical and a slender curved proximalportion, which gradually straightens as it reaches full development.The axis is capillary ; the common canal is slender, andvery much narrower than in the normal form. The cellules arefrom 20 to 30 in an inch, nearly at right angles to the axis, andsometimes approaching the appearance of a Rastrite so nearly as.to be mistaken for such.Locality—Dobb's Linn and Beld Craig.MonograjHus lohiferus (M'Coy).—In this species the stipe islinear, monoprionidian, often of great length. The full grownindividual reaches a breadth of one-tenth to one-twelfth of aninch. The axis is slender. The common canal is rather broad andwell marked. Cellules are nearly at right angles with the axis,but having a slight upward inclination. Their upper margin iscurved, terminating in obtusely rounded lobes, inwhich a notchon the under side separates the rounded extremity from theoblique descending margin (M'Coy). The cellules in full grownspecimens vary from 16 to 18 in the space of an inch. The baseisslender and curved, the common canal having a comparativelygreater width. The cell, as is occasionally well shewn, opens atthe notch in the under side of the cellule. Locality—Dobb'sLinn, Beld Ci-aig, &c.Climacograptus teretiiisculus.—This genus was at first describedby Professor M'Coy, and named by him Di2}lograptus rectangularis.It is very al)undant, having a wide range passing up through theSkiddaw States, Lower and Upper Llandeilo, Caradoc, and Lower