1911] PORTLANDIA ARCTICA GRAY 5 



same forms, as those occurring in the Arctic seas at the pre- 

 sent time. 



Portlandia arctica Gray occurred rather profusely, no 

 less than 88 specimens being picked up in a comparatively 

 short time. The variety here met with was a distinctly developed 

 var. siliqua. In the southern part ot Norway this variety is a 

 characteristic and leading fossil of the deposits of the Ra-stage 

 of the Ra-period. The measured length of the species in this 

 locality was 22 mm. It often occurred with both valves united, 

 and more rarely, juvenile specimens, characterized by their 

 rounded or oval forms, were also found. 



Macoma calcaria Chemn. also occurred in a rather well 

 developed state, twenty-five specimens being picked up, measuring 

 about 39 mm. in length. This species was also of the same 

 type variety as has been met with in a great many localities 

 in the southern part of Norway. One single specimen to some 

 degree showed the same abruptly cut form of the cauda as I 

 also, on a former occasion, described from some other localities 1 . 



Lepeta caeca Mull. occurred in numerous specimens mea- 

 suring up to 18 mm. in length. No less than 23 specimens of 

 the same arctic type, which has also been found in other deposits 

 of the Ra-stage, were picked up in a short time. 



Natica clausa Brod. & Sowb. Of this species four broken 

 specimens were found measuring up to about 25 mm. 



Bela nobilis Moll. Of this species only one single, and 

 much broken specimen was found. 



Neptunea despectahiN. One single, and much broken spe- 

 cimen of a somewhat juvenile form was found, to some extent 

 calling into recollection the variety described and pictured by 

 me on a former occasion 2 . 



Protula borealis Sårs was found in a rather large number 

 of broken specimens of the regular type. 



1 P. A. Øyen: Contributions to the Quaternary Geology of Norway. I. 

 Christianssund. 1911, p. 5. 



2 P. A. Øyen: Kvartær-studier i Trondhjemsfeltet, II, 1911, p. 83. 



