INVEETEEEATE ANIMALS IN PALEOZOIC EOCKS. 



615 



taken from surfaces unquestioDably sculptured by water. A curious 

 complication of such markings sometimes occurs when shrinkage- 

 cracks, overflowed by a succeeding tide, have their edges sculptured 

 by minute rill-marks. Dictuolites JBeckii, of Hall*, is a remarkable 

 example of this. 



Pig. 18. — EiU-marJc. Carboniferous ; Nova Scotia. 



nat. size. (From a Photograph.) 



It would be invidious to refer to the numerous species of ima- 

 ginary fossil plants that have been founded on such markings as those 

 referred to above and shown by figs. 18 and 19. T may merely 

 mention the genera Dendropliycus^ Belesserites, Vexillum, Aristo- 



* ' Palaeontology of New York,' vol. ii. 1852, p. 6, pi. 2. fig. 1. 



