ZANNICHELLIA? 

 PI. II, figs. 22 a, b. 



Half a carpel, which in general shape, size and celkstructure agrees very closely 

 with Zannichellia. It differs in being without spines, and in becoming narrower towards 

 the apex. Without more material we cannot further describe it. 



Length 3.0 mm., breadth 1.0 mm. Reuver. 



ALISMATACEAE. 



SAGITTARIA SAGITTIFOLIA Linn. 

 PI. II, fig. 24. 



A single carpel with part of the wing has been found at Reuver. It resembles 

 our living Sagittaria, but like the Alisma is very small. For the sake of comparison we 

 show on figs. 25, 26, the recent carpels of these two species. No doubt the seeds in 

 carbonising have shrunk considerably, though scarcely to the great extent shown by 

 our fossils; specimens from the Cromerian are however just as small as those from the 

 Reuverian. Possibly the larger sizes of the fruits of our living Alisma and Sagittaria are 

 due to the circumstance that the waters of the ponds and ditches in which they grow are 

 nowadays always more or less fertilized artificially by the washings from agricultural 

 land or highways, or by drainage from farms and houses. 



ALISMA PLANTAGO, Linn. 



PI. II, fig. 23. 



Carpels of Alisma are found at Reuver and Swalmen. They agree with A. Plant ago, 

 but differ in their small size. 



Length 1.8 mm., breadth 1.0 mm. Reuver, Swalmen. 



GRAMINEAE. 



Nodes of grasses are found, though in no great abundance or variety. We have 

 seen no other remains of Gramineae. 



CYPERACEAE. 



Fruits belonging to Cyperaceae are plentiful, though the number of generic types 

 and species is not so large as we might expect. There is an exceptional development of 

 the genus Dulichium. 



63 



