624: E. ETHEEIDGE OX THE PALEONTOLOGY OF THE 



observed, in conclusion, that the dimensions of the specimens now 

 under consideration are greater than those of any of the figures 

 quoted in the foregoing synonymy. 



P. hiarmica was originally described by Keyserling from Petschora- 

 Land ; by Geinitz from beds in Nebraska, which he considered to 

 be of Permo-Carboniferons age (Dyas) ; by Prout from the Upper 

 Archimedes limestone of Chester, Illinois ; by Meek from the Ne- 

 braska-city section of the Nebraska Upper Coal-measures ( = Dyas, 

 Geinitz) ; and by Dr. Toula from Carboniferous beds at Barents 

 Island, Nova Zembla. Some difference of opinion existed between 

 Dr. Geinitz and Mr. Meek as to the identity of the Nebraska fossils 

 with P. hiarmica, Keyserling ; but on this point I am inclined to 

 agree with Dr. Toula, that the various forms may be all included 

 under the one name. 



Loc. Peilden Isthmus, lat. 82° 43'. 



Polypodia, sp. 



Ohs. A species possessing strong interstices, with oval, almost 

 round fenestrules ; in fact the interstices and dissepiments at times 

 almost lose their individuality, and with the round fenestrules give 

 to the polyzoarium a decidedly Phyllopora-like appearance. Two 

 of the specimens exhibit the non-celluliferous face, with the bases 

 of the cells shown through the abrasion of the basal layers. The 

 other specimen is a badly preserved example of the obverse face ; 

 the cells are arranged in three oblique rows on the dissepiments, 

 increasing in number at the points of bifurcation of the latter, and 

 apparently separated by vertical, obscure, wavy ridges. The speci- 

 mens have some characters in common with those I have described 

 in P. hiarmica, but they are probably distinct. The dissepiments 

 appear to be occasionally cell-bearing, and when so there is gene- 

 rally a large cell at the base of the dissepiment on each side. The 

 vertical wavy ridges, and some other minor points, recall to us 

 Polypora tuberculata, Prout* ; but in this species the dissepiments 

 are quite devoid of cells, whilst the oval or almost circular fenes- 

 trules again bring before us P. SJuimardiana, Prout. The cellu- 

 liferous dissepiments resemble those of Fcnestella ampla, Lonsdale t 

 (Protoretepora ampla, De KoninckJ); and, in fact, one specimen in 

 particular recalls to us this species very forcibly, with this excep- 

 tion, that in the Australian form the fenestrules are more elongated 

 and more truly oval than in the Arctic individuals. 



The specimens at my disposal are not of sufficient size to enable 

 me to form an opinion whether the celluliferous face is internal or 

 external; if the former, the resemblance to P. ampla would be 

 strengthened, and the reference of them to the genus Protoretepora 

 indicated, although one of the characters possessed by our specimens, 



* Trans. St. Louis Acad. i. p. 449, t. 18. f. 3. 



t Strzelecki's Phys. Descript. N. S. Wales, 1845, p. 268, t. 9. f. 3. 



\ Foss. Pal. Nouv.-Galles du Sud, 1877, pt. 3, p. 180, t. 8. f. 5, a-d. Prof, de 

 Koninck includes in his genus Protoretepora, besides F. ampla, Lonsdale, Poly 

 pora Shumardiana, Prout, and some other forms. 



