16 P. A. ØYEN [No. 12 



the fossil Balanidae and Verrucidae of Great Britain, 1854, p. 21) 

 and this expression, I suppose, is only to be consented to by 

 every one who had an opportunity to examine a large number 

 of these interesting species. 



The broken specimen of Balanus found in the gravel-pit 

 of the „Bøkeskog a (Beech Forest) near Larvik might really be 

 somewhat deceptive as to the interior structure of the shell. 

 Nearly the same variety, however, I found as well in the 

 northern part of our country near Fagerviken in Rånen as in 

 the southern part in the Island of Gjersø in the neighbourhood 

 of Tønsberg. And, moreover, I had an opportunity to compare 

 this variety with a similar one from the Letfø-bearing clay at 

 Hopedale in Labrador. Specimens sent from Portland in Maine 

 as Balanus geniculatus Gould proved, however, to include as 

 well specimens of Balanus porcatus as of Balanus crenatus. 

 The result of this comparative study was only to testify to the 

 former determination of the above mentioned specimen from the 

 „ Bøkeskog" near Larvik as Balanus porcatus da Costa, 

 Darw. 



The fossil-bearing deposit near Bjørnestad, above mentioned, 

 lying 110 m. a. s. proved to be laid down upon the ra-moraine 

 itself and, moreover, upon a fossil-bearing clay resting on the 

 ra-moraine, and this fossil-bearing clay proved to be no other depo- 

 sit than such a one bearing Portlandia arctica Gray. 



The picture of the accompanying Pl. VI, Fig. 2 gives a 

 picture of the surroundings of this shell-bank near Bjørnestad 

 and in the middle of the picture to the left of the road there 

 is a cutting through the shell-bank itself in the very place where 

 my little son Tor is just occupied in collecting fossils. The 

 following species were found in this deposit: — 



Mytilus edulis L. was very common as forma typica and 

 of a normal size, but mostly crumbling. 



Portlandia arctica Gray. forma typica occurred as var. 

 siliqua as evidenced as well in the shape of the shell as in 

 the structure of the epidermis; length of shell 12.5 mm. 



