Mr. E,. Etlieridge un Carboniferous Polyzoa. 37 



of which are sometimes separated by more or less flexuous lon- 

 gitudinal ridges ; interspaces usually rather thick, and not 

 pierced by transverse pores, but occupied by very minute, non- 

 septate longitudinal cells that are closed and represented at the 

 surface by minute granules or spinules." 



Mr. Meek considered that Millepora rhoinbifera, PhilL, Vin- 

 cularia ornata, Eichw., and Favosites serialis, Portlock, might, 

 "with much confidence, be included in this genus." The first 

 of these has been shown by the Messrs. Young to be a species 

 of their genus Rhahdomeson] but with regard to the others I 

 am not in a position to form an opinion. Mr. Meek concluded 

 his description with this remark : — " Although some species 

 of this genus [Rhomhojpora] have been referred to Goldfuss's 

 genus Vinculariaj they are widely removed from the typical 

 Cretaceous species of that genus." I think it probable that 

 Rhoinhopora will be found a very convenient one for numerous 

 small Polyzoa of our Carboniferous and, perhaps, Silurian 

 rocks, the generic affinities of which have often been a 

 stumbling-block to authors. The relation of Rhomhopora to 

 Vincularia requires investigation ; but I would in the mean 

 time suggest an examination (to those who have well-preserved 

 specimens) of the following species : — Vincularia ornata, 

 Eichw. ; V. muricata^ Eichw. ; V. Benniei^ mihi ; Cerio- 

 pora hamiltonensisj Nicholson ; Millepora interporosa^ Phill. ; 

 M. oculata, Phill. ; j\I. spicularis^ Phill. ; and M. similis, 

 Phill. 



Rhomhopora has been adopted by Dr. Toula * for certain 

 forms from the Perm io- Carboniferous rocks of Spitzbergen. 



EXPLANATION OF PLATE II. a. 



Fig. 1. Fenestella arctica, Salter, var. scotica, R. Eth., Lower Carboni- 

 ferous Limestone group, Currielee Quariy, Edinburghshire. 

 Nat. size. 



Fig. 2. A small portion, much enlarged, non-poriferous face, to show the 

 zigzag interstices and hexagonal fenestrules. 



Fig. 3. Glancono7iie elegantula, R. Eth., Lower Carboniferous Limestone 

 group, Harelaw Quarry, Haddingtonshire j poriferous face, some- 

 what enlarged. 



Fig. 4. A portion of fig. 3, much enlarged. 



Fig. 5. Another specimen of the same, striated or non-poriferous face, 

 nat. size., Harelaw Quarry, Haddingtonshire. 



Fig. 6. A portion of fig. 5, much enlarged. 



(I am indebted to Mr. Wilson for the drawings.) 

 * Sitz. d. k.-k. Akad. d. Wissenschaften zu Wien, 1875, Ixxi. 



