tion the celksculpture agrees exactly; but our fossil is considerably larger and more 

 rugose. We figure the recent H. Ascyvon (fig. 19) for comparison. 



HYPERICUM Sp. 2 (= Tegelen Sp. 7). 

 PI. XIII, figs. 20, 21. 



Seeds cylindrical (fig. 21 is crushed), bluntly pointed at either end; testa smooth 

 shining; surface sculpture of small hexagonal pits not elongated, arranged in about 30 

 somewhat irregular longitudinal rows. 



Length 1.0 mm., breadth 0.4 mm. Reuver, Swalmen, Brunssum, Tegelen. 



The walls of the pits are black whilst the sunk part is light*brown ; this gives a 

 reticulated appearance to the testa. 



This seed is apparently the same as that from Tegelen, figured by us in 1910 

 (op. cit. fig. 10). Some of the Reuver seeds are quite as broad as the one there figured; 

 the best seeds from the Reuverian happen to be narrow specimens. We are still unable 

 to identify the species. 



HYPERICUM Sp. 3. 

 PI. XIII, fig. 22. 



Seed cylindrical (crushed) rounded at ends; testa rough; pitting very obscure 

 though the surface is well preserved. 



Length 1.1 mm., breadth 0.75 mm. Swalmen. 



Only one seed has been found. The obscurity of the surface sculpture in this 

 seed is partly due to the second layer of cells showing through the outer hexagonal 

 layer, giving a confused appearance to the testa. The second layer is formed of digitate 

 interlocking cells flattened above and below. These two layers of cells appear to be 

 characteristic of many of the forms ; but they vary in relative thickness in the different 

 species. Sometimes the outer hexagonal or quadrate pits are deep ; in which case the 

 testa has a honeycombed appearance, as in H. Ascyton. In other species, as in the one 

 we are now considering, this layer is thin and the digitate cells below are seen through 

 it. Sometimes the walls of one or other of these layers of cells are thickened unequally ; 

 then various kinds of tubercles are formed. 



HYPERICUM Sp. 4. 

 PL XIII, fig. 23. 



Seeds small cylindrical slender bluntly pointed at either end ; testa shining, with 

 hexagonal pits elongate transversely in the proportion 3 to 2 ; pits arranged in regular 

 longitudinal rows, middle of cells raised slightly, giving rise to flat rather obscure 

 longitudinal striation. 



Length 0.9 mm., breadth 0.4 mm. Reuver. 



This and species 2 may be somewhat closely allied. 



119 



