2o8 



VINE : MICRO-PALEONTOLOGY. 



when tlie dust is mounted — properly prepared — in Canada balsam. 

 The Entomostraca I have spoken of previously as peculiar, and as 

 some of my slides were submitted for examination to Mr. J. W. 

 Kirkby, he desired me to allow Professor T. Rupert Jones to 

 examine them also, as some of the forms were either new or very 

 little known, consequently the names are provisional only in the 

 present Hst of Skelly Gate forms. The Polyzoa of the Shales are 

 very poor and scanty, and the species few in number. 



Class POLYZOA. 

 Sub-order cyclostoimata Busk. 

 Fam. FENESTELLID^. 



Genus FENESTELLA Miller and Lonsd. 

 (See Naturalist, Oct. 1884, p. 62.) 



1 Fenestella plebeia M'Coy. 



Mostly in fragments ; but some of the specimens have the well- 

 marked characteristics of the species, and have both the non, as well 

 as the tuberculated keel common in specimens froai the Hairmyres 

 district of Scotland. 



Earn. DIPLOPORIDM (Naturalist, Oct., p. 63). 

 Genus DIPLOPORA Young and Young. 



2 Diplopora marginalis Young and Young. 



Fragments belonging to this species are rather more abundant in 

 these Shales than any other of the forms described in my October 

 paper. In the mode of branching, &c., the Skelly Gate fragments do 

 not differ in any material sense from those of the upper Limestone 

 Shales of Scotland, but the characteristic features of the cell mouth 

 varies slightly in different parts of the zoarium. In some of the more 

 delicate stems (or branches), the orifice of the cell is small, and in 

 these the septum, separating the more minute pore below, is very 

 distinct. ' In the larger, or more robust fragments, the orifice of the 

 cell is also large, and the margin (peristome) slightly serrated, and 

 beneath these it is difficult at times to make out whether the smaller 

 opening, together with its intervening septum, is present or not. 

 The other characters of the species, such as a ' mesial ridge bearing 

 a tubercle between each pair of cells, together with a narrow ridge 

 running parallel to this on either side of the mesial ridge,' are also 

 distinct (see Naturalist, loc. cit. p. 64, No. 6). This type, however, 

 of branch and cell is found more frequently in the upper, rather than 

 in the lower Carboniferous Shales of Scotland. 



With regard to the existence of this secondary, or ' sub-oral ' pore 

 in some of the Palaeozoic species of Polyzoa, Mr. A. W. Waters 



Naturalist, 



