Mr. R. Etheridge on Carboniferous Polyzoa. '65 



tion of which, thau the original, will be found in the ' Conrs 

 (^lementaire de Paldontologie ' *. 



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

 for a freshwater genus of Veneridfe f, but afterwards appears 

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

 place that of Glaucomya or Olauconomya \. 



Glauconome elegantula^ sp. nov. (PL II. a. fio-s. 3-6.) 

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

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

 branch mclmed upwards. Obverse of the stems and branches 

 angular; reverse rounded or flattened, with longitudinal micro- 

 scopic stride. Cell-apertures arranged in a single line on each 

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

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

 between eveiy two branches on each side ; on the branches 

 they are m 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 



Ohs. This very small and elegant species of Glauconome 

 has come under my notice both from the Carboniferous series 

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

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

 i^ .U.b., and afterwards m greater quantity on the surface of 

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

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

 a bipmnate example, from which the above description is 

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

 hterous face the bases of the cells are seen followino- one 

 another m close succession and in an unbroken line (figs S& 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 rikt 

 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 

 Mo\w ''''2n^''t? ^"'iv/'^f ^?^1°^'' 1848, p. 631;' Woodward, 'Man, 



3* 



