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



Unfortunately the upper surface of the colony is not well preserved so 

 that the characters of the apertures, which are very important for a 

 specific determination, are not known. The thickness of the upper layer 

 is about 2 mm. in the thinner parts. A thickening at one place may 

 possibly indicate the former presence of a monticule. 



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

 south of Borgen. 



Cryptostomata. 

 Fenestellidae. 

 Fenestella LONSD. 



Fenestella sp. 



Two very small fragments of an impression of what probably has 

 been a Fenestella-lorm are found in pieces of black limestone, one also 

 with the Fistulipora sp. 



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

 south of Borgen. 



Brachiopoda. 



Atremata,. 



Lingulidae. 



Lingula BRUG. 



Lingula sp. 



PI. VII, fig. 1. 



The inner side of one valve and an incomplete internal cast of 

 another are known. The form is oblong, nicely rounded, with the greatest 

 width to the front of the centre. Length 10 mm., width 7 mm. The 

 anterior margin is relatively very broadly rounded, the posterior margins 

 meeting at the beak at an obtuse angle. The cast shows a moderate 

 convexity, with a narrow, flat, or slightly concave marginal rim, broadest 

 in front. A fine concentric striation is visible on the surface, and in the 

 centre of the cast a very faint longitudinal depression is visible, corre- 

 sponding to a very low median ridge. On the inner side of the valve, 

 to the front of the centre and in the median line, a faint elevated point, 

 corresponding to a depression on the surface of the valve is visible. 



This specimen shows some resemblance, inter alia, to several of the 

 forms from the Lower Helderberg of New York and the Gaspe district, 

 e. g. L. spathata and L. rectilaterata HALL, yet it seems to exhibit 

 distinct differences in outline, besides being smaller. On account of 

 the fragmentary material I will refrain from naming it. 



Occurrence: B, middle part, between Reindeer Valley and Valley 

 south of Borgen. 



