498 B. ETHERIDGE ON ADHERENT CARBONIFEROUS rRODUCTID^E. 



32. Farther Remarks on Adherent Carboniferous Producttd^:. By 

 K Etheridge, Jun., Esq., E.G.S. (Head March 20, 1878.) 



(Communicated with the permission of the Director-General of the 

 Geological Survey.) 



1. Introduction. 



Since I had the honour to communicate to the Society a paper on 

 an " Adherent Form of Productus, &c." *, I have obtained evidence 

 that the habit of clinging or attaching themselves by their spines 

 was not simply confined to certain forms of Strophalosia and Pro- 

 ductus, but, there is good reason to believe, was possessed also by a 

 species of Chonetes. 



Before proceeding to describe the specimens upon which this belief 

 is founded, I wish to make a few supplementary remarks on the 

 adherent Productus. 



2. Note on Productus complectens (mini). 



Subsequent researches have shown that the geographical distribu- 

 tion of this species is much more extensive than was at first thought. 

 Mr. James Bennie has obtained some well-preserved examples of the 

 younger state of P. complectens at Scremerston Quarry, near Berwick, 

 in Northumberland, on the south side of the Tweed, and he has also 

 met with examples at one or two localities in Fifeshire. I think it not 

 at all improbable that P. complectens will be found at one or other of the 

 Lanarkshire localities ; for, by the kindness of Mr. J. Smith, Eglington 

 Iron "Works, Kilwinning, I have been able to examine two small 

 fragments of Crinoid stems, on which are what appear to be por- 

 tions of two or three of the small clasping spines, but too frag- 

 mentary to pass a definite opinion on. Soon after my description 

 was published, I was favoured by Mr. J. Smith, through Mr. Bennie, 

 with the loan of the subject of Eig. 1, obtained by him at Auchen- 

 made Quarry, near Dairy, Ayrshire. It is a portion of a stem of 

 Poteriocrinus crassus, Miller, with at one point a series of spines 

 arranged in a more or less radiating manner from a common central 

 object, which has become obliterated to a large extent or, I think, 

 partially removed. There is, however, at one point a depression in 

 the Crinoid stem partially filled up with a thin layer of shelly 

 matter, which I believe to be the remains of a Productus ; for the 

 spines are certainly those of that genus ; as, however, nearly the 

 whole of the shelly matter has been removed, little more can be 

 said about the specimen. A " Note," calling attention to Mr. Smith's 

 specimen, was communicated to the Natural-History Society of 

 Glasgow by Mr. J. Young, E.G.S. ; but as evidence of adherent 

 Productidse appears to be on the increase, I think it advisable to 

 figure the example. Mr. Young considers this to be specifically 



* Quart. Journ. Geol. Soc. vol. xxxii. p. 454. 



