THE CHEESE-GROTTO IN THE EIFEL. 



139 



taceans, possibly some of the same animals as those that left the 

 Protichnital trail-markings on the surfaces of the sandstone. 



The Climactichnites is also analogous, in respect to its transverse 

 bars, to the Crassopodia Emhletonii, Tate (' Geologist,' vol. ii. p. 66, 

 pi. 2, fig. 2 ; and ' Berwickshire JVat. 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 Pliillipsia 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, Liimdoid animals made the trails above mentioned, we mnst 

 remember that, according to Mr. W. H. Baily,* the so-called " Limuli" 

 of the Coal-period, or more properly the Bellimiri, are more closely 

 allied to the Trilobite than to the Limidus, having well-defined tho- 

 racic segments ; and therefore probably true Limuli had nothing to do 

 witli the production of any of the Protichnital trails. Trilobitid, 

 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 ofi"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 OE BEETEICH-BADEN, 

 IN THE EIEEL. 



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, 

 scorise, 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 Murchison, 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, Geol. 

 Surv. Map Irelaucl/ p. 13, figs. 3 and 4. 



