NATURAL HISTORY SOCIETY OF GLASGOW. 327 



•Hairmyres, East Kilbride ; and Gillfoot, near Carluke : Crinoid 

 shales, Hook Point, Ireland. 



This fepecies is readily distinguished by the graptolithic aspect 

 which it owes to the lateral position, prominence, and triangular 

 profile of its cells. The figures show some variations of this 

 ornament: thus, in figure 16, the lateral ridges are not simple, but 

 composed of a series, each of which starts opposite a cell, runs 

 upwards, expanding till it terminates at the second cell, which 

 is, as it were, pierced in its expanded extremity. Again, the 

 secondary ridges are obsolete, or represented by the raised inner 

 margins of the cells. 



This sj^ecies, in possessing the second orifice, differs from all 

 the species hitherto described. We would therefore propose the 

 sub generic name Diplopora, for it and for such other species as 

 may yet be found to present the same peculiarity. It may be 

 found necessary to erect this into a distinct genus; but, having in 

 view the remarkable resemblance presented by all the fossils which 

 may be included under the general definition of Glauconome, 

 quoted above from M'Coy, we do not feel justified in proposing 

 the separation. For the same reason we would suggest A canthopora 

 as the sub-generic designation of G. stellipora, the character of 

 which we quote below. (Q. J. G. S., xxx., p. 682). 



Glauconome (Acanthopora) stellipora, noUs. 



Plate iv.. Figs. 25, 2Q. 



Stems nearly cylindrical, branching irregularly, bearing two 

 rows of alternate cells, with prominent circular orifices, over which 

 eight radial denticles converge as in Actinostoma, a smaller orifice 

 beiijg placed at one end of the cell, on the side of the prominence, 

 and separated from the larger aperture by an interval, which 

 never exceeds one-third the diameter of the larger cell. The 

 stem is ornamented with a sinuous mesial ridge; and sinuous 

 ridges likewise pass from cell to cell. All these ridges are finely 

 tuberculated ; or, more correctly, beaded. The non-poriferous 

 face is traversed by longitudinal parallel ridges, which are also 

 finely tuberculated. Occasionally a larger cell occurs in the angle 

 of the branches ; but the small size of the fragments, hitherto 

 obtained showing the poriferous face, renders it impossible to say 

 whether they are of frequent occurrence. They are possibly 

 ovicells. 



