COASTS VISITED BY THE ARCTIC EXPEDITION - . 617 



5. Polypora subquadrata, Toula; a species not possessing any 

 peculiarly distinctive characters. 



6. Polypora, sp., near P. marginata, M'Coy. It appears to differ 

 from the type in the absence of the particularly characteristic broad 

 flat margin of the branches &c. 



7. P. crassipapillata, Toula, from Hofer Island, as pointed out by 

 the author, appears to be closely related to P. papillata, M'Coy. I 

 much doubt if it is more than a variety. 



8. P. pustulata, Toula, near P. pustulata, mihi. A well-marked 

 and peculiar form from Hofer and Scheda Islands. It is compared 

 by Dr. Toula with P. fastuosa, De Koninck. There is a very marked 

 difference between the size of corresponding portions in the respec- 

 tive species. 



9. Polypora, sp., near P. dendroides, M'Coy. The same form 

 mentioned by the author in his paper on Spitzbergen in the ' Neues 

 Jahrbuch/ previously referred to. 



10. Archimedes arctica, Toula. The extension of this peculiar 

 subgenus of Fenestella into the rocks of the Arctic regions is an in- 

 teresting fact, as it appears to have hitherto been found chiefly in 

 the Warsaw and Keokuk limestones of Illinois, Indiana, and Mis- 

 souri. Hofer Island. 



11. Fenestella retiformis, Schlotheim, Barents Island ; a Permian 

 form ; also found in Spitzbergen rocks (Toida). 



12. Fenestella, sp., near F. Shumardi, Prout. Under this name 

 are grouped several forms — one not easily distinguished from F. 

 fiabellata, Phillips ; another related to F. plebeia, M'Coy ; a third 

 having the cup-like form and anchoring rootlets of F. memhranaeea, 

 Phill. ; a fourth nearer to the typical F. Shumardi, Prout, but for 

 which, from the minute nature of the pores and fenestrules, Dr. 

 Toula proposes the varietal name of minima. A fifth and last form 

 is included, possibly allied to F. carinata, M'Coy. So far as I un- 

 derstand Dr. Toula's remarks, these all appear to be regarded as 

 varieties of one form. 



13. F. inconstans, Toula. A form in which there appears to be 

 little division between the interstices and dissepiments, and the 

 fenestrules are irregular in outline. The cells occur in circlets round 

 the fenestrules in a rather peculiar and uncommon manner, giving 

 to the polyzoarium, as Dr. Toula himself remarks, somewhat the 

 appearance of a Phyllopora, King. 



14. F. undulata, Phill. ? Fragments of a form somewhat allied 

 to this British species were noticed. 



15. F. tenuijlla, Phill. Specimens exhibiting a very delicate net- 

 work render it probable that this species also occurred in the Barents- 

 Island collection. 



16. F. Goldfussiana, De Koninck. 



