LUCERNARIDA. 



209 



movements when creeping about on the muddy bottom of the sea in 

 shallow water, or by the trailing of their tentacles over soft sediment. 

 In view of this evidence, he has suggested that the peculiar striated 

 and furrowed markings in the Cambrian rocks (" Fucoidal Sand- 

 stone ") of Sweden which have been described under the name of 

 Eophyton (fig. 91), are to be regarded as really produced by the 

 trails of Jelly-fishes. These peculiar markings were originally de- 

 scribed as the remains of land-plants, but it seems certain that this 



Fig. 91. — Fragment of Eophyton Linneanum. Lower Cambrian. 



cannot be their real nature. Nathorst has, in fact, produced pre- 

 cisely similar markings by allowing plants to trail over soft mud ; 

 and if the so-called Medusites of the Swedish Cambrian is rightly 

 regarded as founded on the casts of the gastric cavity of Jelly- 

 fishes, we have in these a proof that there existed at the time ani- 

 mals capable of producing the striated trails of the same deposits 

 to which the name of Eophyton 1 was originally applied. 



1 The fossil described by Hicks from the Cambrian rocks of Wales under the 

 name of Eophyton explanatum has been shown by Hinde to be really the anchor- 

 ing-rope of a Hexactinellid Sponge. 



VOL. I. O 



