321 



nana» which was recorded by his father V). It seems to me, 

 however, as if the specimens from East-Greenland might be divided 

 into two groups; the one would be in accordance with the typical 

 Portlandia frigida as it has been described and figured by 

 TorelT'^), the other, on the contrary, by the lesser height of 

 the shell and the more ventricous shape in accordance with 

 M. Sars' s P. nana. For this reason I cannot approve of 

 quite excluding F. nana; on the other hand 1 think it better 

 only to consider it a variety of P. frigida, since it only differs 

 from this by the shape of the shell and since transitional stages 

 moreover occur. I cannot confirm the difference that P. frigida 

 has fewer teeth than P. nana, as I find the number in both to 

 go up to 8 — 9. M. Sars himself has also felt doubtful. For 

 he writes as follows under i^Yoldia nana Sars, nov. spec.» : «An 

 varietas Yoldiae frigidae Torell?» It is however correct that 

 there is a slight difference in size. Among the specimens at 

 hand from East-Greenland the largest y?i\\nana measures 3'5 mm., 

 while the largest typical frigida is of a length of 5 mm. 



Arcidae. 



Area glacialis Gray. 



1900. Cape Hope 121 fms. Glaywith stones 2 specimens. 



1900. Hurry-Inlet 10 — Clay 11 — and I valve. 



1900. Hurry-Inlet 50 — Clay with stones ca. 80 — 



1891— 92. Janneson-Land 10—60 — 3 — 



1900. Fleming-Inlet 118— Clay 3 — 



1900. Forsblad- Fjord ca. .50 — Clay with stones 4 — and 8 valves. 



1900. Forsblad-Fjord 90—50 — Glaywith stones 2 — and 1 valve 



1891-92. 72° 53' N.20° 36' W. 96 — 3 -- 



The maximum length is reached by specimens from Hurry- 



') M. Sars: Om de i Norge forekommende fossile Dyrelevninger fra Quartær- 

 perioden, p. 99, Fig. 118-120; Universitetsprogram for 1864. (1865). 



*) O. Torell: Bidrag til Spitsbergens MoHuskfauna, 1859, p. 148. Tab. 1, 

 Fig. 3. 



21* 



