OLAF HOLTEDAHL. fsEC. arc. exp. fram 



brown or greyish-yellow colour, and very often surprisingly heavy. South 

 Cape^ is huilt up entirely of this brown hmestone (se pi. II, fig. 2). In 

 its lower layers were found species of Maclurea, and Halysites, pointing 

 to middle Silurian. "^ 



I have studied the material from South Cape, but 1 cannot add 

 very much to what has been written already. The fossils are found to be: 



Halysites catenularia Lin. 

 The form agrees very much with the variety gracilis Hall, in 

 having corallites of subrectangular form without intervening tubules. 



Strophomena, sp. 

 Two very imperfect outer moulds of ventral valves and a fragment 

 of a dorsal valve are found. Outline sub-hemicircular, the valves are 

 nearly flat in the posterior part, the ventral with slightly elevated beak, 

 strongly curved at the I'ounded margin with an extension in the middle. 

 The surface with fine radiating striae, every second, and in some in- 

 stances, every third one of which is stronger than the rest. They are 

 crossed by very faint concentric lines and by very delicate oblique 

 wrinkles. The form seems to come fairly close to forms both from 

 the Trenton and the Richmond of North America, but any closer deter- 

 mination is, however, made impossible by the fi-agmentary character of 



the material. 



Maclurea. sp. 



Only the under side of two specimens known. We have a large form 

 before us, the diameter of an incomplete piece with about three volutions 

 being 11 cm. As the upper part of the shell is not known at all, no 

 detei'mination can be made. 



Though the material is too insufficient for any quite exact conclu- 

 sion as to the age of those fossils, I am inclined to believe that it is 

 another locality of the old Trenton-fauna, which is so well known from 

 a great many occurrences in the Arctic Archipelago. Specimens of Haly- 

 sites are quite common in this horizon and the same may be said of 

 the Maclureas. 



In the higher portion of this limestone series, "the brown-limestone 

 of the capes" we find Silurian fossils. The best collection of fossils from 

 this upper part was made on the east coast of North Devon at "Baad- 



1 On the west siJe of the mouth of Harbour (Havne) Fjord. 

 " Silurian in the sense Ordovician-Silurian. 



