421 



Fig. 2. Area pectunculoides^ Scacchi, var. septentrionalie. (Hs.). 



Testa a latere dextro (a) et superne (b) exhibita; c. val- 

 vula dextra a facie interna visa. 



— 3. Area nodulosa, Miill. {B.). 



Testa a latere dextro (a) et superne {b) exhibita; c. val- 

 vula dextra a facie interna visa. 



— 4. Nucula delphinodonta^ Migh. {V.). 



Testa a latere sinistro (a) et superne {b) exhibita; c. val- 

 vula sinistra a facie interna visa. 



— 5. Nucula tumidida, Malm. {L.). 



Testa a latere sinistro (a) et superne (1) exhibita; c. val- 

 vula sinistra a facie interna visa. 



— 6. Nucula temas, Mont. (F.). (Speciraeu inter formam typicam 



et var. : expansam iatermedium). 



Testa a latere sinistro (a) et superne (b) exhibita. 



— 7. Portlandia arctica, Gray. (L.). (Specimen subfossile?) 



Testa a latere dextro (a) et superne (b) exhibita. 



— 8. Portlandia lucida, Lov. (L.). 



Testa a latere dextro (a) et superne (b) exhibita. 



— 9. Portlandia intennedia^ M. Sårs. (F.). 



Testa a latere dextro {a) et superne {b) exhibita. 



— 10. Portlandia lenticula, Møll. (F.). 



Testa a latere dextro (a) et superne {b) exhibita. 



— 11. Portlandia frigida, Torell. (F.). 



Testa a latere dextro (a) et superne (b) exhibita. 



— 13. Yoldia limatula^ Say. {L.). 



Testa a latere sinistro (a) et superne {b) exhibita; c. val- 

 vula sinistra a facie interna visa. 



Tab. 5. 



Fig. 1. Leda pernula, Miill. {Hm.). 



Testa a latere sinistro (a) et superne {b) exhibita ; c. val- 

 vula sinistra a facie interna visa; d. valvula dextra specimi- 

 nis juvenilis a facie externa et interna exhibita. 



— 2. Leda mimita., Miill. (Hm.). 



Testa a latere dextro (a) et superne {b) exhibita. 



