THE CHEESE-GROTTO IN THE EIFEL. 
139 
taceans, possibly some of the same animals as those thai left the 
Protichnital trail-markings on the surfaces of the sandstone. 
The CJimaciichnifes is also analogous, in respect to its transverse 
bars, to the Crassojwdia Emhletonii, Tate (' Geologist,' vol. ii. p. 66, 
pi. 2, fig. 2 ; and ' Berwickshire Xat. Field-club Transact.,' vol. iv. 
p. 104, pi. 1, fig. 2), which, according to Mr. A. Hancock's views 
{loc. cit., p. 456), would be an infallen gallery, probably made by a 
Trilobite belonging either to the genus Fhillipsia or Griffitliides. 
Trilobites, and those of large size, are present in some of the older 
palaeozoic rocks of North America, not far from the geological horizon 
of the Potsdam Sandstone ; and, although they do not appear to have 
been preserved in this littoral sandstone, yet there is the possibility 
of their having frequented the shallow waters of that old sea, just as 
the Trilobites of the Carboniferous period probably furrowed the 
Lower Carboniferous sands without being preserved therein. If, 
however, Limidoid animals made the trails above mentioned, we must 
remember that, according to JMr. AV. H. Baily,* the so-called " Limuli" 
of the Coal-period, or more properly the Bcllimiri, are more closely 
allied to the Trilobite than to the LimvJus, having well-defined tho- 
racic segments ; and therefore probably true Liimili had nothing to do 
with the production of any of the Protichnital trails. Trilobital, 
Bellinural, Amphipodal and other Crustaceans, with sea-worms and 
molluscs, may have made most of the trails, runs, or tracks that we have 
to do with in the Palaeozoic rocks, and even insects may have aided 
in some instances, as intimated by Mr. Emmons, — but we want much 
more information in nearly all cases. Nor are we better off" as regards 
our knowledge of similar markings in the Secondary and Tertiary 
strata. It is hoped that the foregoing notes may suggest further 
research in the right direction. 
THE CHEESE-GEOTTO OP BERTEICH-BADEN, 
IN THE EIFEL. 
The mountainous district known as the Eifel, or Eifel-Gebirge, in 
Ehenish-Prussia, is, as all geologists know, famous for the numerous 
well-preserved craters of extinct volcanos and for the lava-streams, 
scoria?, trachyte, and basalt connected therewith. 
The English reader will find a short account of the tertiary and 
volcanic rocks of the Eifel in Lyell's ' Manual of Geology,' chapter 
xxxi. ; and a good geological map of the Eifel and neighbouring dis- 
tricts is appended to a paper, by Sedgwick and ^lurchison, on the 
Ehenish Provinces, in the Transactions of the Geological Society, 
2nd series, vol. vi. part 2. In the Eifel there are two extensive 
areas, in which volcanic activity has been especially intense. One of 
* Journal Geol. Soc. Dublin, vol. viii. p. 89; and 'Explanation of Sheet 137, Gcol. 
Sui-v. Map Ireland,' p. 13, figs. 3 and 4. 
