6 P. A. ØYEN [No. 5 



Balanus crenatus Brug. Darw. A råtner small specimen. 



Moreover, some concretions were found having a rusty- 

 brown colour. 



The vegetable remains were especially represented by casts 

 or impressions of leaves. My friend Ove Dahl, curator of the 

 Botanical Museum of Christiania has been kind enough to look 

 over the whole material and revise all the determinations. The 

 following species were found: — 



Zostera marina Lin. forma typica. 



Potamogeton pectinatus Lin. f. zosteraceus Fr. The outer 

 shape of the casts recals the figures of Potamogeton zosteri- 

 folius Schum. with Reichenbach (Deutschlands Flora, Pl. XXVII) 

 that is the very same species as designated by Blytt as P. com- 

 pressus Lin. (Norges Flora, Vol. I, 1861, p. 367). 



Alisma plantago Lin. forma typica. 



Salix nigricans Sm. 



Populus tremula Lin. forma typica 



Betula nana Lin. forma typica. 



Alnus incana D. G. occurred as well impressions of leaves 

 as in casts of cones. 



Corylus avellana Lin. A east of a nut was found mea- 

 suring 20 mm. in length and 10 mm. in breadth. We must, 

 however, bear in mind that the specimen has become somewhat 

 squeezed, but the superficial structure is rather well preserved. 

 And, a direct comparison proves this structure to be very cha- 

 racteristic. We are here only to note the direct comparison with 

 fossil specimens from the Railway-Cutting of Etterstad where I 

 found this species in the clay some fifteen years ago; here the 

 following measures were tåken : length 15 mm., breadth 8 mm., 

 and thickness 7 mm. 



Vaccinium vitis idaea Lin. A very fine east of a leaf was 

 found measuring eleven millimetres in length. 



Some small bits of coal were also fund and not seldom 

 remains of bark and casts of twigs and branches. As quite a 

 rarity may be mentioned the occurrence of a small bit of leaf, 



