32 OLAF HOLTEDAHL. [SEC. ARCT. EXP. FRAM 



Capulidae. 



Platyceras CONRAD. 



Platyceras ellesmerelandi nov. sp. 



PL VIII, fig. 20. 



Shell spirally and obliquely conical, consisting of one whorl that 

 rapidly increases in thickness from the apex towards the aperture, the 

 detailed characters of which can not be directly seen. On the surface 

 can be observed one broad and relatively strong longitudinal ridge, on 

 the outer side of the whorl, and faint indications of others on both sides 

 of the above. 



This form shows some likeness to several American as well as 

 European Devonian Platyceras-species, yet differs sufficiently to be re- 

 garded as an independent form. 



Occurrence: B, upper part, point north of the Beautiful Valley. 



Cephalopoda. 



Nautiloidea. 



Orthoceratidae. 



Orthoceras BREYN. 



Orthoceras sp. 



A small fragment, about 2 cm. long with a circular section and the 

 diameter increasing in the said distance from 8 to 12 mm. Surface 

 and interior unknown. 



Occurrence: B, lower part, Reindeer Valley. 



Orthoceras sp. 



Another fragment of about the same size, but less conical in form, 

 showing the small siphuncle lying a little eccentric. The section of the 

 shell is circular as far as can be seen from the incomplete specimen. 

 A septum of moderate convexity closes the lower end of the shell. A faint 

 line, a small distance above this septum possibly indicates another, in 

 which case the distance between two septa would be 4 mm. while the 

 diameter of the shell here is 14 mm. Surface smooth. 



Occurrence: B, upper part, in the fragment limestone, Valley south 

 of Borgen. 



