Vol. 52.] COL. H. W. FEILDEN IN ARCTIC NORWAY, ETC. 745 



generally similar in structure, but the crystallites are even less 

 distinct. Several ' earthy ' scoriaccous fragments occur ; others, 

 which are minutely granular in structure and of a brown or dark 

 colour, may represent a sedimentary rock (varieties of indurated 

 gritty mud). Among the mineral fragments are chips of quartz, 

 often angular, retaining sometimes traces of a crystal-face, but 

 occasionally augmented by secondary deposit. Haematite is present, 

 also (rather numerous) minute crystals of a brownish tint, with 

 high refraction and rich polarization-colours, probably zircon. The 

 vesicles in the fragments are filled either by the carbonate already 

 mentioned, or (much more rarely) by a zeolite, which bears some 

 resemblance to heulandite. It is impossible to say whether this 

 interesting rock is a volcanic ash, or is mainly composed of volcanic 

 material transported from no great distance ; but I incline to the 

 latter view. .From its general aspect I should conjecture its age to 

 be either early Palaeozoic or very late Archaean. 



(2, 3, 4 — Island in Kostin Schar, July 19th.) Dull grey, fine- 

 grained, sedimentary rocks, consisting, probably, of quartz and more 

 or less decomposed felspar, with a few flakelets of white mica. 

 They are rather fissile, and in (2) the structure has the appearance 

 of a true but imperfect cleavage. This specimen contains a few 

 specks of pyrite. 



(v) Neckwatowa Lake and River, lat. 71° 20' N. 



These rocks are fossiliferous limestones, and they were accordingly 

 submitted to Mr. E. T. Newton, F.R.S., who kindly examined 

 those from Kolguev Island, and has favoured us with the remarks 

 quoted below. 



5, 17, 27 are from Maltzan Island in Neckwatowa Lake (July 20th). 

 ' They seem to be portions of the same rock. Upon their 

 weathered surfaces are rod-like bodies, 1 to 2 millimetres in 

 diameter, the longest of which measures perhaps 15 millim. This 

 rock is so crystalline that microscopic sections fail to reveal any 

 definite structure in these rods, although some exhibit indistinct 

 radiating lines and others rather resemble AmphvporaJ 



The other specimens, seven in number, are from the banks of the 

 Neckwatowa River (July 22ud). ' (10, 11, 14) contain portions of 

 corals which, on account of their short septa, are thought to bo 

 Amplexus or some allied form. (2d) includes a portion of a tur- 

 binate coral, a Ehynchonella, possibly an Athi/ris or S/ririfera, and 

 what looks like a fragment of a crinoid stem, having four divisions 

 in the central aperture. (This specimen and No. 11 are labelled 

 Iron Gate.) (G) shows indications of a coral, and perhaps also 

 of a brachiopod ; (31) contains remains of a coral : (13) includes a 

 fragment of a stromatoporoid, possibly Idiostroma or Amphipora. 1 



