308 SIMILAR REMAINS IN GERMANY. 
We learn from a recent German publication 
(Zieten's Versteinerungen Wiirttembergs. Stutt- 
gart, 1832, PI. 25 and PI. 37,) that similar remains 
of pens and ink bags are of frequent occurrence 
in the Lias shale of Aalen and Boll.* Hence it 
is clear that the same causes which produced 
these effects during the deposition of the Lias at 
Lyme Regis, produced similar and nearly con- 
temporaneous effects, in that part of Germany 
which presents such identity in the character 
and circumstances of these delicate organic re- 
mains-t 
suffered partial destruction from the action of water before they 
were covered and protected by the muddy sediment that has 
afterwards permanently enveloped them. Further proof of the 
duration of time, during the intervals of the deposition of the Lias, 
is found in the innumerable multitudes of the shells of various 
MoUusks and Conchifers which had time to arrive at maturity, at 
the bottom of the sea, during the quiescent periods which inter- 
vened between the muddy invasions that destroyed, and buried 
suddenly the creatures inhabiting the waters, at the time and 
place of their arrival. 
* As far as we can judge from the delineations and lines of 
structure in Zieten's plate, our species from Lyme Regis is the 
same with that which he has designated by the name of Loligo 
Aalensis ; but I have yet seen no structure in English specimens 
like that of his Loligo Bollensis. 
f Although the resemblance between the pens of the Loligo 
and a feather (as might be expected from the very different uses 
to which they are applied) does not extend to their internal 
structure, we may still, for convenience of description, consider 
them as composed of the three following parts, which, in all our 
figures, will be designated by the same letters, A. B. C. 
First, the external filaments of the plume, (PI. 28, 29, 30, 
