1913] SOME CLAY DEPOSITS IN THE S.-E. PART OF NORWAY 15 



height above the level of Femsjø. Pl. V, Fig. 2 gives a view 

 of some of these terraces as seen from the railvvay-station of 

 Tistedal. 



To the south of the railvvay-station of Tistedal a certain 

 one of these terraces proves to be rather well developed at a 

 height of about 120—140 m. a. s. rising in gentle slopes. Near 

 Sommerro and Orød we find the terrace-level to be 130 and 129 

 m. a. s. respectively and near Bjørnestad the terrace-level is 

 120 m. a. s. Some five metres lower down, viz. 115 m. a. s. 

 there was a small summit-pass just where a narrow road had 

 been cut through the terrace which in this place was rather well 

 developed. And about seven metres below the level of this 

 terrace-summit the road cut through a shell-bank built up from 

 alternating layers of sand and gravel sloping gently towards the 

 south. This deposit proved to be rather rich in broken speci- 

 mens of various mollusca and was found to have a depth of 

 nearly a couple of metres. 



This deposit lying at a level of 108 to 110 metres above 

 sea-level and near to the ridge-top of the large ra-moraine pro- 

 ved, however, to be of a very different character from that descri- 

 bed by me on a former occasion from the ra-moraine near 

 the town of Larvik (P. A. Øyen: Nogle bemerkninger om Ra- 

 perioden i Norge, 1911, pp, 22—29). In the just mentioned 

 deposit near Larvik there proved to be a fossil-bearing layer of 

 gravel below the clay-deposit which contained a number of speci- 

 mens of Portlandia arctica Gray. The position of this fossil- 

 bearing gravel overlying a morainic deposit and covered with 

 clay may be seen from Pl. VI, Fig. 1. In this gravel the 

 following fossils were found, Macoma sp., Saæicava sp., 

 Sipho sp., and Balanus porcatus da Costa., Darw. as de- 

 scribed on a former occasion (1. c. p. 25). On this occasion 

 I shall only add some remarks on the occurrence of Balanus 

 porcatus in that place. As to the structure and appearance of 

 Balanus porcatus and Balanus crenatus Brug., Darw. even 

 Darwin himself tells us that "they sometimes resemble each 

 other in a very deceptive manner" (Darwin: A Monograph on 



