466 SCIENCE PROGRESS. 



of the Coniferae, which was formerly widely spread through- 

 out the American and European continents in Mesozoic and 

 Tertiary times. 



Numerous other genera which might be compared with 

 more or less probability with existing types, need not be 

 considered ; nor can we discuss the various examples of 

 Wealden plants which possess certain features of interest 

 but are of no special importance from our present point 

 of view. 



In summarising our knowledge of such Wealden species 

 as may be referred with a considerable degree of cer- 

 tainty to existing families or genera, the following may 

 be mentioned : — 



CHAROPHYTA. — Chara Knowltoni Sew. C. Jaccardi Heer. 



BRYOPHYTA— Marchantites Zeilleri Sew. 



PTERIDOPHYTA.— 



i. Equisetace^e. — Equisetites Burchardti Dunk. E. Lyelli Mant. 

 2. Filicin^e. — 



(a). Polypodiacese. Onychiopsis Mantelli (Brongn.). O. elongata 



(Geyl.). 

 (b). Matonineae. Matoniduim Gbpperti (Ett.) ? Microdictyon Z)un- 



keri (Schenk). 

 (c). Cyatheaceae. Protopteris punctata Sternb. 

 (d). Gleicheniaceae. Gleichenia sp. 

 (e). PSchizaceae. Ruffordia Gopperti Sew. 



CYCADALES.— 



i. BENNETTiTEiE. Bennettites Saxbyanus (Brown). B. {William- 

 sonia) Carruthersi Sew. Also several American and other 

 species. 



2. PCycadacEjE. — Yatesia Morrisii Carr. Bucklandia anomala 

 (Stokes and Webb). Fittonia Ruffordi Sew. Androstrobus Na- 

 thorsti Sew. Cycadeoidea gigantea Sew. (This species of Pur- 

 beck age agrees with Bennettites is the possession of the character- 

 istic fern-like ramenta on the petiole bases, but there is no evidence 

 of any lateral shoots bearing flowers.) 

 The numerous species of cycadean fronds cannot be assigned with any 

 certainty to one or other sub-division of the Cycadales. 



CONIFERAE.— Pinites Ruffordi Sew. P. Solmsi Sew. P. Dunkeri 

 Carr., etc. Araucarites sp. Araucarioxylon sp. Thuites sp. 

 Brachyphyllum obesum Heer. B. spinosum Sew. {cf. Athrotaxis 

 sp.). 



