OF OHETACEOUS PLANTS. 247 



Qyroporella (Giimbel) is another genus recorded in the Cre- 

 taceous, but it was first described from Permian rocks. It is 

 outwardly similar to Neomeris, but with loss complex structure. 



Tribe AcetabulariEjE ? 



The extremely problematic fossils which have been placed in 

 the genus Oyrophyllites, founded by Glocker in 1841 for some 

 Jurassic specimens, have a number of representatives in true 

 Cretaceous deposits, and also in the Flysch. Heer (1877) founds 

 and figures three species (pi. Iviii), G. obtusifolius, G. Oosien, 

 and G. pentanurus, from the Swiss Cretaceous. His genus 

 Discophorites, with the species D. anjustilohus and D. Fischer!, 

 shows no characters really to separate it from the previouslj' 

 named " genus," and must be included in " Gyrophyllites." 

 Lorenz (1901) considers the " genus'' at some length and defi- 

 nitely places it in the Acetabularieae, although Solms-Laubach, 

 iu his classical monograph on the AcetabularieiE (Solms-Laubach, 

 1901), does not discuss these fossils, but notes their extremely 

 problematic nature in his text-book. Lorenz (Z. c.) determines 

 several new species from the Flysch deposits. 



Order PH^OPHYCEJi; {\) 



[Living family.] 



Algse, almost entirely marine, with a large, branched and 

 complex thallus. Multicellular, with some cell-differentiation. 

 Chromatophores golden brown in living cells. 



Genua CHONDRITES, Sternberg. 

 [Flora d. Vorwelt, 1838, p. 25.] 



Algse, or fossils which suggest algse, with a much-branched 

 dichotomous or sympodial thallus which is cylindrical. 



The essential feature of the fossils described under this generic 

 name is the cylindrical form of the branches. These are not 

 flattened in the rook like most plant-remains, and they often 

 lack all traces of carbonaceous material. They are frequently 



