02 NATHORST, OM NÅGRA FÖRMODADE VAXTFOSSILIER. 



Figg. 11 — 12. Efter naturen tecknade spår af en sandmask. 

 På fig. 11 synes det hål, hvarigenom masken krupit upp på sandens 

 yta. På fig. 12 är detta doldt af sand. 



Figg. 13 — 16. Spår af rinnande vatten under olika förhållanden. 



Explanation of the plates. 



Figs. 1 — 2. Schematical figures showing the formation, on the 

 sea-shore, of trails from plants drifting with currents. 



Figs. 3 — 5. Impressions produced by Zostera, when fixed with 

 one end in the sand it is exposed to the action of billows. To 

 compare with Cordaites? Nilssoni Torell (Bidrag till Sparagmit- 

 etagens geognosi och paleontologi. Acta Universitatis Lundensis 

 Tom IV) and with Eophyton? palmatum Nicholson (Geol. Magaz. 

 1869). The plant, which has produced this latter form, has appa- 

 rently been branched. 



Figs. 6 — 7. Trails produced, fig. 7 by a Fucus, fig. 6 by a 

 Floridé as in figs 1 — 2. Drawn from nature. To compare with 

 Eophyton Linneanum Torell (1. c.) and Linnarsson (Geol. Magaz. 

 1869). 



Fig. 8. Trails produced as in figs 6 — 7 when the plant has 

 not reached the bottom perfectly but only with a few branches. 

 Drawn from nature. To compare with some forms of Eophyton 

 Linneanum Torell (1. c. Tab. 11 fig. 3). 



Fig. 9. Trails produced by a Fucus. The curved impressions 

 produced by a transverse branch. Drawn from nature. To compare 

 with »pars folii circinnati?» Torell (1. c. Tab. II fig. 3e)*, 



Fig. 10. Trails with an uncommon regularity probably pro- 

 duced by a dichotomous branch of Fucus. Drawn from nature. 



Figs. 11 — 12. Trails of worms, fig. 11 with the central hole 

 from wich it has stretched its body; in fig. 12 this hole is covered 

 with sand.. To compare with some forms of Chondrites, Buthotrephis. 

 Palaeophycus etc. Drawn from nature. 



Figs. 13 — 16. Trails produced by water running on sand. 

 Drawn from nature. To compare with some of just named supposed 

 vegetable fossils. . , 



I 



