in E. nodulosa. The cells are about twice as deep as they are broad, their lateral walls 

 are not so thick as in E. nodulosa, and the cell=cavity is larger in proportion. The relative 

 thickness of palisade*layer to inner coats is about 1:2; the testa is thinner than in any 

 other species of the genus. 



CERATOPHYLLACEAE. 



CERATOPHYLLUM? Sp. Nov. 

 PL VII, figs. 15, 16. 



Though nuts of a living species of Ceratophyllum are so common in the Cromer* 

 ian and Teglian, only a single doubtful specimen belonging to this family has yet been 

 found in the Reuverian, and the family is still entirely missing in older deposits. The 

 specimen now to be described is one half of a nut, which has germinated, and has also 

 somewhat decayed. It, unfortunately, does not show the internal impression of the 

 very characteristic embryo, which is so perfectly preserved in some fossil specimens from 

 Cromer; we cannot therefore be certain that the Reuver fossil belongs to Ceratophyllum. 



Nut broadly ovate quadrangular in cross*section, dividing into 2 valves in 

 germination; valve strongly keeled irregularly tuberculate below rounded above, 

 without persistent style. Inside showing very thick walls, with slight trace of an aper* 

 ture at the base, and perhaps another at the apex (both very obscure), and torn remains 

 of the adhering testa. 



Length 4.5 mm., breadth 3.2 mm. Reuver. 



We draw attention to this curious fruit, and to PL XVIII, figs. 11a, b. If they 

 do not belong to Ceratophyllum we can suggest no other position. They are about the 

 size of recent nuts, but the first has several short tubercles at the base instead of 2 spurs, 

 and both are without the persistent woody style. 



RANUNCULACEAE. 



This family is represented by 13 species, all of which however belong to the 

 section Anemoneae. Batrachium, so abundant in all newer deposits, is entirely wanting. 

 The other sections of the family have fruits and seeds more fragile or soft; therefore 

 their non*discovery does not imply that they were absent. 



ANEMONE Sp. 1. 



PL VII, fig. 18. 



Fruits belonging to Anemone are not common, but those found may belong to 

 5 different species. The carpels of Anemone yield few specific characters beyond their 

 outlines, and these are much obscured by hairs. The genus is also so large, that without 

 more material we hesitate to determine the species or to describe the fossils as new. We 

 have not come across any like them amongst the recent fruits we have examined. 



89 



