Mr. R. Etheridge on Carboniferous Polyzoa. 35 



tion of which, than the original, will be found in the * Cours 

 ^lementaire de Paldontologie ' *. 



Dr. J. E. Gray used the term Glauconome, in 1828 or 1829, 

 for a freshwater genus of Venerid^e t, but afterwards appears 

 to have abandoned it ; and either he or Bronn proposed in its 

 place that of Glaucomya or Glauconomya \. 



Glauconome elegantula, sp. nov. (PI. II. A. figs. 3-6.) 



Spec. char. Polyzoariura bipinnate ; main stem and secon- 

 dary stems zigzag, giving off at each angle a simple lateral 

 branch inclined upwards. Obverse of the stems and branches 

 angular; reverse rounded or flattened, with longitudinal micro- 

 scopic striee. Cell-apertures an-anged in a single line on each 

 half of the angular stems and branches, those of one line alter- 

 nating with those of the other ; on the stems there are three 

 between every two branches on each side ; on the branches 

 they are in an unbroken series ; in all the margins are level 

 with the general surface of the stem or branch, as the case 

 may be, as there is no evidence of any rim or projecting 

 lip. 



Ohs. This very small and elegant species of Glauconome 

 has come under my notice both from tlie Carbonifer ous series 

 of the north of England and south of Scotland. I first 



observed it on some shale sent to me by Mr. Hugh Miller, 

 F.G.S., and afterwards in greater quantity on the surface of 

 weathered shale collected by Mr. Benuie. The figured speci- 

 men is simply pinnate, but we have in the Survey collection 

 a bipinnate example, from which the above description is 

 taken. When the outer layer is removed from the non-cellu- 

 liferous face the bases of the cells are seen following one 

 another in close succession and in an unbroken line (figs. 5 & 6), 

 and would give rise to the idea that a similar disposition 

 would be found on the obverse. On the latter, however, the 

 cells are arranged in two alternating lines, one on each of the 

 angular faces — the first cell, as it rises from the basal layer, 

 passing to the right, the second to the left, the third to right 

 again, and so on throughout the whole stem. Having failed, 

 after a careful search, to find any published description of a 



Glauconome suitable for the reception of this form, I have 

 assigned to it the above name. 



• 1852, vol. ii. p. 104. 



t Spicilegia Zoologica, 4to (1828 or 1829 ?), No. 1, p. 6. 



X Bronn, "Index Pal." ' Nomenclator,' 1848, p. 531 ; Woodward, * Man, 

 Mollusca,' 2nd ed. p. 477 ; Stoliczka, ' Pal. Indica,' iii. p. 91 ; Pictet, 

 ' Traits de Pal; iii. p. 462. 



3* 



