326 PROCEEDINGS OF THE 



fresh investigations, which are only possible because the specimens 

 are now more numerous, and the opportunities are greater of 

 obtaining well-preserved examples. Further, most of the Polyzoa 

 defined by Goldfuss, Lonsdale, and M'Coy, were referred to the 

 Corals. Their systematic position has since been altered, but we 

 are not prepared to say that the change has been in all cases 

 correct. We have only the hard parts to study; and the Actinozoa 

 and Polyzoa have several points of resemblance in the structure 

 of their calcareous skeletons. We do not offer any systematic 

 redistribution of the fossils, not wishing to add to the confusion 

 in which these zoophytes are still involved; but we merely wish 

 to guard ourselves against misconception, if we continue to speak 

 of all these forms as Polyzoa. We have been careful to provide 

 data, by means of transparent sections, by which we, or others 

 having better opportunities, may in the future follow out the 

 investigation. 



The rich Limestone shales and Limestones of the Lanarkshire 

 Coalfield have yielded a large number of -species, the following of 

 which seem to be new — namely, Glauconome steUipora, G. asperaj 

 G. laxa, G. rctroflexn, G. marginalis, G. flexicarinata, G. elegans. 



Glauconome (Diplopora) marginalis, sp. nov. 

 Plate iii.. Figs. 14-21. 



Polyzoary erect, slender, branching at intervals; cells of the stem 

 (twent3^-six, in one-fourth inch on each side), alternate, and margi- 

 nal, giving a serrated outline, which is rendered more pronounced 

 by the prominence of the upper margin of the circular aperture. 

 Beneath the cell, in perfect specimens, is a small orifice, the septum 

 between the two being very nari'ow and easily broken down, giving 

 the large opening a pyriform shape. A mesial ridge bears a tubercle 

 between each pair of cells. A narrow ridge runs parallel to this, 

 on either side of it; but in the slenderest specimens the margins 

 of the cells encroach on these lateral ridges, and interrupt them. 

 The reverse is traversed with finely tuberculate, parallel, longi- 

 tudinal ridges. There are no pinnules, and the branches come off 

 at irregular distances, forming an angle of 40" with the stem; 

 opposite the base of each branch is a cell about twice the size of 

 the others. The cells and ridges of the branches are of similar 

 character with those of the stem. 



Localities: — Upper Limestone shales at Boghead, near Hamilton, 



