1 6 INTEODTJCTION. 



Cryptomerites rigidus, Phill. = Cryptomerites divaricatus, Bunb. 



Ctenis falcata, L. & H. = Ctenis falcata, L. & H. 



Cycadites zamioides, Leek. = Taxites zamioides (Leek., ex Bean MS.). 



Czekanowskia Heeri, Nath. 



0. rigida, Heer = Czekanowskia Murrayana (L. & H.). 



C. setacea, Heer. 



Ginkgo digitata, Brongn. = Ginkgo digitata (Brongn.). 



6. Huttoni, Sternb. = G. digitata (Brongn.), var. Huttoni. 



G. whitbiensis, Nath. = G. whitbiensis, Nath. 



Nilssonia angustifolia, Bean MS. = Nilssonia mediana (Leek., ex Bean MS.). 



N. eompta, Phill. = N. compta (Phill.). 



N. mediana, Bean MS. | = ^ mediana . 



N. tenuicaulis, Phill. ) 



N. tenuinervis, Nath. = N. tenuinervis, Nath. 



Otozamites acuminatus, L. & H. = Otozamites acuminatus (L. & H.). 



0. Beanii, L. & H. = 0. Beani (L. & H.). 



0. distans, Nath. 



0. gracilis, Phill. = Williamsonia pecten (Phill.). 



0. gramineus, Phill. 



0. graphicus, Bean MS. = 0. graphicus (Leek., ex Bean MS.). 



0. lanceolatus \ = Q acuminatus (L . & H-) . 



0. latifolius, Phill. ) 



0. mediamts, Leek. = 0. Beani (L. & H.). 



0. obtusus, L. & H. = 0. obtusus, var. ooliticus. 



0. parallelus, Phill. 



0. tenuatus, Bean, sp. = 0. Bunburyanus, Zign. 



Podozamites distans, Presl \ 



P. lanceolatus, L. & H. > = Podozamites lanceolatus (L. & H.). 



P. lanceolatus, var. minor, Schenk / 



Pterophyllum rigidum, Phill. 



Ptilozamites Leckenbyi, Bean, sp. = Ptilozamites Leckenbyi (Leek., ex Bean MS.). 



Schizolepis, sp. 



Solenites furcata, L. & H. = Baiera Lindleyana (Schimp.). 



S. Murrayana, L. & H. = Czekanowskia Murrayana. 



Sphertzda paradoxa, L. & H. = Beania gracilis, Carr. 



f Sphcenozamites undulatus, Sternb. = Williamsonia gig as (L. & H.). 



Taxites brevifolius, Nath. 



T. laxus, Phill. = Taxites zamioides (Leek., ex Bean MS.). 



Thuytes expansus, Sternb. = Brachyphyllum mamillare, Brongn. 



Wakhia Williamsonis , Brongn. = Pagiophyllum Williamsoni (Brongn.). 



Williamsonia gigas, L. & H. = Williamsonia gigas (L. & H.). 



W. hastula Bean MS. J = ^ (phm 



W. pecten, Phill. ) 



A glance at a geological map of England reveals the existence of 

 a band of Jurassic rocks stretching diagonally across England from 

 the coast of Yorkshire to Dorsetshire in the south-west. Between 

 the Yorkshire strata and those of corresponding age in the midland 



