Plant cc. 
91 
sonia), very similar to the species common to the Yorkshire 
Oolites. Among the Jurassic plants are ninny fine examples of 
stems of Cycads \Mantellia) from the Purbeck beds of Portland. 
Two fine trunks of coniferous trees (Cedroxylon) are placed 
in the centre of the Gallery ; one of these, formerly in the 
Baber Collection, has been cut transversely to show the structure. 
They are highly siliceous, and occur in the Purbeck Beds of the 
Isle of Portland. Another, but more slender, silicified tree from 
Portland, about 8 feet in height, is placed upon a pedestal 
between Wall-cases Nos. 12 and 13, on the East side of this 
Gallery. 
The series of Zamia ( Williamsonia) from the Scarborough 
Oolites is altogether unique. Some large stems of coniferous 
trees ( Arancarites ), from the Lower Lias of Lyme Regis, are 
mounted separately in frames and placed in the recesses between 
Wall-cases Nos. 13 and 14 ; 14 and 15. 
The Triassic series is well represented by some large slabs 
from India containing well-preserved leaves of Ferns, the chief 
of which is known as Gloss opt er is ; the collection has numerous 
specimens of this fern from South Africa and Australia. The 
Palaeozoic plants are of much interest, the specimens having all 
been catalogued by Mr. 11. Kidston. Among Permian forms 
may be mentioned the fine series of polished sections of silicified 
Fern-stems mostly belonging to the genus Psaronius, all showing 
a most perfect internal structure ; they abound in the New Red 
Sandstone of the neighbourhood of Chemnitz, in Saxony, and 
have been described by M. Cotta. There is also a fine section of 
silicified stem of Tree-fern (Stemmatopteris) from Brazil. The 
Carboniferous plants are abundantly represented, not only from 
this country, -but from all parts of the world. Among the 
Ferns are fine specimens of Neuropteris, Sphenopteris , P ecopteris , 
etc., many of them showing the sori, or fructification. The 
genera Catamites, Lepiduclendron , Lcpidostrobus, Lepidophloios, 
Sigillaria , and Stigmaria, etc., are all well represented in the 
collection. Under the Cycads are placed Cordaites, Cardioca.rpus, 
etc. A peculiar genus of supposed plant is the Paloeoxyris 
from the coal ironstones of Dudley. A stem section of a large 
coniferous tree ( Araucaryoxylon ) from the Calciferous Sandstone 
of Craigleith, near Edinburgh, occupies the recess between 
Wall-cases Nos. 16 and 17 ; the intimate structure of this is 
readily seen in microscopic sections exhibited in Table-case 
No. 31. Among Devonian plants are fine examples of the 
Irish fern, Palceopteris, from. Kiltorkan, near Waterford, and 
the stems of Psilophyton from Canada and Scotland are somewhat 
numerous in the collection. Silurian plants are rare, and 
usually only imperfectly preserved, consisting chiefly of Alga? 
( Bythotrephis ), and some other very uncertain forms, such as 
Pachytheca , etc. 
Gallery, 
No. 10. 
Plantae. 
