in. 



THE FAUNA OF THE JURASSIC SEDIMENTS 

 AT CAPE FLORA. 



1. STATE OF PRESERVATION OF THE FOSSILS. 



Judging from the material submitted to me by Prof. Nansen, some por- 

 tions of the Jurassic sediments at Cape Flora must be called rich in fossils. 

 Particularly, rock of type 4, mentioned in the last chapter, is in some places 

 thickly interspersed with fossil remains, especially of lamellibranchs. 



Unfortunately the fossils are generally very imperfect. They consist of 

 broken and crushed specimens, or of imperfectly preserved internal casts and 

 impressions. 



The greater number of the lamellibranchs, which are very numerous, 

 judging from the preserved remains, could not be determined at all. In some 

 of them, the genus could hardly be determined, and the species could be 

 identified only in a few specimens. The results obtained by the examina- 

 tion of the lamellibranchiata are in consequence not very satisfactory. 



The few brnchiopods (2 species) are also mostly in broken fragments, 

 though sufficiently well preserved for identification. The most perfect remains, 

 in comparison, are those of cephalopods. Although they are chiefly only 

 fragments and impressions of some quite young specimens of ammonites 

 that occur, they could be identified with a very fair amount of certainty. 

 The nacreous shells of the ammonites, generally inclosing a cast of pyrite 

 or brown ironstone, strongly recall the manner of preservation of the 

 ammonites in the Russian Jura. Fragments of belemnite guards found loose, 

 occur in numerous pieces, and are, to a certain extent, easily identified 



