I02 vine: MICRO-PALiEONTOLOGY OF REDESDALE SHALES. 



shape of the corallum (?) round or oblong, cell openings coraUites (?) 

 circular, separated by an interspace with from one to two circlets of 

 very fine reticulations, invisible to the naked eye, only sparely 

 indicated when a hand-glass is used, but perfectly distinct when 

 examined with a one-inch object glass. I have not found the species 

 in any of the Shales except the Redesdale, and here the forms are 

 moderately abundant. 



The Scotch species A. nexilis has been heretofore placed 

 among the Polyzoa, but in his critical examination of species 

 Mr. John Young, of the Hunterian Museum, Glasgow, writes me 

 that in all probability we shall have to give up, as Polyzoa, this as 

 well as one or two other species. For the present, therefore, it may 

 be well to leave them with the Monticulipora. 



MISCELLANEOUS FORMS UNCLASSIFIED. 



1 Palaeocoryne radiatum Duncan and Jenkins. 



2 Palseocoryne scoticum Duncan and Jenkins. 



3 Spiniferous processes of Polyzoa. Referred to by Mr. John 



Young. 



With regard to the zoological position of these organisms, various 

 opinions are still extant. My ov/n opinion is that they are appendages 

 of species of Feimtella^ and Mr. Howchin many years ago sent me a 

 very fine series from Haltwhistle, remarking at the same time that 

 they were rather abundant in certain material in that locality. I have 

 never had shale from Haltwhistle, so I cannot say. The student will 

 find the organism well illustrated in Dr. Duncan's original paper on 

 PalcEocoryne^ in the Phil. Trans., clix., p. 693, in a paper by Prof. 

 John Young and Mr. J. Young in the Quart. Jour. Geo. Soc, Vol. 

 XXX., 1874, ai^d ^Iso in my own papers on Falcsocoryne, &c., 

 Science Gossip, Oct. and Nov., 1879. 



4 Ortonia carbonaria J. Young (Annelida). 



5 Crinoidea : fragments of different species. 



6 Archseocidaris (?), fragments of. 



7 BracMopoda (?). A single specimen of some, to me, 



unknown species. 



8 Productus, spines of — very numerous in fragments. 



9 There is a small serrated spine (?) in these shales which I 



cannot name at present. It is very minute, and is rather 

 abundant in the finer siftings ; and I have found in one of 

 the Scotch Shales a form very similar to that of Redesdale. 

 I have not met with it in any other of the Northumberland 



Shales. Naturalist^ 



