Professors Heim 8f Penck — Glaciers of the Isar and Linth. 259 



Fig. 4. Notidanus eximmSfWagn.; lower tooth, outer view. Corallian, Schnaitheim. 

 B.M. (35763 a.) 



5. Notidanus ezimius,V?&gn.; upper tooth, inner view. Corallian, Schnaitheim. 

 B.M. (22500.) 



6. Notidanus sp. ; upper tooth, outer view. Corallian, Schnaitheim. B.M. 

 (22502.) 



7. N. serratus ? Fraas ; upper tooth, outer view. Oxfordian, Scarborough. 

 B.M. (35667.) 



8. N~. Daviesii, A. S. Woodw. ; lower tooth, outer view. Oxfordian, St. 

 Clement's. Oxford Museum. 



9. Notidanus sp. Oxfordian, St. Clement's. Oxford Museum. 



10. N. microdon, Agass. ; anterior upper tooth, outer view. Chalk, Norwich. 

 B.M. (24927.) 



11. N. microdon, Agass. ; upper tooth, outer view. Chalk, Sussex. B.M. (4164.) 



12. ,, ,, ,, „ „ „ Kent. B.M. (44580.) 



13. ,, ,, lower „? inner ,, „ Norwich. B.M. (24928.) 



14. ,, ,, ,, ,, outer .„ ,, ,, B.M. (35648.) 

 15- ,, ,, „ ,, „ „ ,, ,, B.M. (48950.) 



16. N. lanceolatus, A. S. "Woodw. ; upper tooth, inner view. Gault. B.M. 

 (p. 1227.) 



17. N. dentatus, A. S. "Woodw. ; upper tooth, outer view. L. Greensand, 

 Amuri Blufi, New Zealand. B.M. (p. 2303.) 



18. N. dentatus, A. S. "Woodw. ; lower tooth, outer view. L. Greensand, 

 Amuri Bluff, New Zealand. B.M. (p. 2303 a.) 



19. N. primigenius, Agass. ; anterior upper tooth, inner view. M. Eocene, 

 Hampshire. B.M. (p. 4707.) 



20. N. primiqenius, Agass. ; anterior upper tooth, outer view. Miocene, 

 Baltringen. B.M". (35533.) 



21. N. primiqenius, Agass. ; anterior upper tooth, outer view. Red Crag, 

 "Woodbridge. Beed Collection, York Museum. 



22. N. primigenius, Agass. ; lower tooth, outer view. M. Eocene, Barton 

 Cliff. B.M. (p. 1224.) 



23. N. serratissimus, Agass. ; tooth, outer view. London Clay, Sheppey. 

 B.M. (24618.) 



24. N. serratissimus, Agass. ; young tooth, outer view. London Clay, Sheppey. 

 B.M. (28890.) 



25. N. serratissimus, Agass. ; lower tooth, young, inner view. London Clay, 

 Sheppey. B.M. (30550.) 



26. N. serratissimus, Agass. ; lower tooth, young, inner view. London Clay, 

 Highgate. B.M. (43133.) 



[B.M. = British Museum. All the figures are of the natural size.] 



IV. — On the District of the Anctent Glaciers of the Isar 



AND OF THE LlNTH. 

 By Prof. Albert Heim, of Zurich, and Prof. Albrecht Penck, of "Vienna. 1 



IN order to interchange our views, and arrive at a common under- 

 standing on the question of the connection of glaciers with the 

 formation of lakes, we undertook a joint excursion in Upper Bavaria, 

 in the district of the Ammer Lake, Wuerm Lake, Staffel Lake, and 

 Eieg Lake, and later, in the month of September, we visited together 

 the shores of the Lake of Zurich, partly accompanied by Dr. K. I. 

 V. Steenstrup, of Copenhagen, Dr. A. Wettstein and Dr. E. Brueckner, 

 of Hamburg. We have drawn up a short protocol, both on the facts 

 observed and of our views respecting them, which we here propose 

 to communicate. 



1 Translated from the authors' MSS., by Dr. G. J. Hinde, F.G.S. 



