STOMATOPOR.E AND ASCODTCTYA. 



619 



4. Ascodictyon radians?, Nich. & Ether. (Provisional placement.) 



I have several colonies of this beautiful type apparently similar 

 to those found in the Carboniferous rocks of Scotland. The colonies 

 are not so prolific, however, in the Silurian as they are represented 

 to be in the East Kilbride district. In the Silurian the clusters 

 rarely exceed two or three ; in many cases there is only one stellate 

 group of " elongated vesicles." Eor the present I merely record 

 their discovery, reserving more detailed description for some future 

 time when my material is better worked. 



Log. Buildwass beds, near base of Wenlock Shale, Shropshire. 



Hob. On stems of Crinoidea and fragments of shell. 



"Without committing myself to any systematic classification (other 

 than that suggested in the text) of these peculiar fossils, I think it 

 would be unwise and ungenerous on my part to conclude this paper 

 without speaking most approvingly of the labours of Prof. Nicholson 

 and Mr. Robert Etheridge, Jun., in the same direction as my own. 

 Prof. Nicholson remarks, in the paper on Ascodictyon* , that this 

 " genus, so far as our present knowledge goes, is confined to the 

 Devonian and Carboniferous periods." I am now able to extend 

 its range. 



Ascodictyon, Men. & Ether. Jun. 



Upper Silurian A. stellatum, var. siluriense, mihi Shropshire. 



Middle Devonian... A. stellatum, JSTich. & Eth Hamilton, Ontario. 



,, „ ... A. fusifomne, „ „ ,, 



Upper Silurian A. radians?, „ „ my own cabinet.. Shropshire. 



Carb. Limestone ... A. radians, „ „ ,, „ Scotland. 



„ „ A^stellatum „ „ „ „ „ 



Stomatopora, Bronn, uniserial species. 



Lower Silurian 8. inflata, Hall Trenton Limestone, 



America. 



„ ,, S. inflata, (Hippothoa inflata, Nich.) Hud son -River For- 



mation. 



Upper Silurian 8. dissimilis, Vine ; my own cabinet Buildwass beds, 



Shropshire. 



Permian 8. Voigtiana, King. Humbleton, York- 



shire. 



Discussion. 



The President stated that very important results were being ob- 

 tained from these washings of Mr. Maw's of Upper Silurian rock. 

 Some of those obtained by Mr. Davidson were of the highest value. 

 Aulopora had been made a receptacle for very various forms. 



Prof. Duncan said that the value of Mr. Yine's researches was 

 very great. The numbers of Polyzoa produced were very great ; and 

 some of the Heteroporce were singularly recent in aspect. 



* Ann. & Mag. Nat. Hist. June 1877. 



