I. Lower Devoniaii. 



A piece of red sandstone from Grey-Hook, northern 

 Spitzbergen, is identical in character with some of the rocks 

 in the >'Cornstone» series of the English Lower Old Red 

 Sandstone. It exhibits characteristic remains of Pteraspis 

 Nathorsti, Länk., which is already known from Dickson Bay 

 and Klaas Billen Bay. 



II. Upper Devoiiian. 



Two imperfect impressions of scales from the grey sand- 

 stone of Bear Island, belong to the typically Upper Devo- 

 nian genus, Holoptychius. The more imperfect specimen is 

 marked with thick ridges partially subdivided into rounded 

 tubercles, as in the European species, H. (//ganteus, Ag. It 

 ma})- even belong to the latter species, which is already 

 known from Belgium, Scotland and Russia. The second spe- 

 cimen, however, exhibits a peculiar ornamentation which 

 distingnishes it from all known forms. This may be described 

 under the name of 



Holoptychius monilifer, sp. nov. (fig. 1). 



This scale is unfortunately incomplete along the greater 

 part of the börder, and its position on the trunk cannot 

 be determined. Its covered portion (a) is marked by rows of 

 very small tubercles, closely arranged and radiating forwards 

 from the line of demarcation of the ornamented exposed area. 

 The latter (?>) is marked with much fewer and larger radiating 

 rows of tubercles, which pass into short ridges, sometimes 

 bifurcating, as they reach the covered portion of the scale. 



