84 Proceedings of the Boyal Society 
broader, and then it is only the second saddle instead of the first 
lobe which includes the knobs. The only peculiarity then of the 
Llineburg specimens is precisely what in other cases would be 
called a dwarfing — i.e.^ the signs of age appearing in connection 
with smallness of size ; which fact, taken in connection with the 
rarity of this fossil in the Liineburg beds, probably points to the 
existence of climatic or other circumstances unfavourable to the life 
of this cephalopod. 
The other question, that, namely, of the lapse of time, — in other 
words, whether the Liineburg strata are Lettenkohl or not, — must be 
settled on its own merits. Admitting the Lettenkohl as a distinct 
subordinate formation later than the Muschelkalk, then it appears 
that the Myoylioria Pes anseris is rare in the Muschelkalk, abun- 
dant in the Lettenkohl, and abundant at Liineburg ; its evidence 
therefore points to the identity of the Luneburg strata with the 
Lettenkohl. On the other hand, the Geratites nodosus is frequent 
in the Muschelkalk, but hitherto unknown in the Lettenkohl ; its 
evidence therefore, unlike the other, rather connects the Luneburg 
beds with the Muschelkalk. In other words, the 3Iyophoria Pes 
anseris proves that these strata are not Muschelkalk but Lettenkohl, 
while the Geratites nodosus shows. that they lie nearer the Muschel- 
kalk than any Lettenkohl strata yet found. 
As regards the underlying gypseous limestone, this conclusion 
determines its age as greater than that of part of the Lettenkohl. 
That it is much older is not likely ; and the existence elsewhere in 
the Lettenkohl of similar formations, accompanied as here by salt, 
indicates that the Kalkberg of Liineberg belongs to the Upper Trias, 
and probably to the Lettenkohl itself. 
Curiously enough, this conclusion dissociates Luneburg from 
Germany, where the Lettenkohl is not at all, or but very slightly, 
saliferous, — the saline deposits of Germany being found in the lower 
Muschelkalk, — and connects it with France, Switzerland, and Eng- 
land, where it is in the Lower Keuper distinctively that salt is 
richly present. 
2. On the Occurrence of Stratified Beds in the Boulder Clay 
of Scotland, and on the Light which they throw upon the 
History of that Deposit. By Alex. Geikie, Esq., F.G.S. 
