I. GEOLOGY. 723 



3354. Plates of British Fossils, from the annual volumes 

 of the Palseontographical Society. 



The Rev. Thomas Wiltshire, M.A., Sec. G. S. 

 Illustrating : 



Pleistocene Mammalia (skull of Felis spelsea). 

 Upper Greensand Urchins (Caratomus rostratus). 

 Lower Greensand Urchins (Trematopygus faringdonensis). 

 Wealden Reptilia (Radius and Ulna of Iguanodon Mantelli). 

 Purbeck Mammalia (Teeth and Jaws of Stylodon, Leptocladus, Belodon, 

 &c.). 



Oxford Clay Belemnites (Belemnites Purosianus ; B. porrectus). 

 Inferior Oolite Corals (Thecosmilia Wrighti ; T. Fleming!). 

 Trigoniae (Trigonia signata ; T. Moretoni). 



Liassic Corals (Astrocaenia gibbosa, Helistraea Moorei, &c.). 



Starfish (Ophioderma Gaveyi ; O. Egertoni). 

 Carboniferous Flora (Halonia regularis). 



Devonian Crustacea (Sylonurus Powriei ; Cheirurus articulatus). 

 Brachiopoda (Spirifera disjuncta, Spiriferina cristata). 

 Fish (Cephalaspis Lyelli; C. Murchisonii). 

 Silurian Trilobites (Phacops, Amphion, Asaphus). 



Eurypterida (Slimonia acuminata, Plerygotus bilobus). 



3355. Collection of Fossil Plants, proving the existence 

 of the elements of recent flora in that of the Tertiary period, com- 

 prising examples of the elementary forms of salt and fresh water 

 flora, and of the various continents, including Australia. 



Fossil plants from various localities in the Tertiary formation 

 are also exhibited, exemplifying the origin of our recent local 

 flora from ancient types. 



This is shown by coloured tickets attached to the specimens. 



The change of the fossil Castanea atavia into the recent 

 Castanea vesca is also illustrated. 



Professor Dr. Constantin Baron von Ettingshausen, Graz. 



The above are original specimens collected in Styria, Carniola, Croatia, 

 Dalmatia, the Tyrol, Hungary, and Bohemia. 



The recent plants bearing closest analogy to the fossil plants are shown 

 for comparison. 



In the ancient Tertiary strata the Castanea atavia has distantly toothed, 

 or nearly toothless leaves, devoid of thorny points. From the primary 

 vein spring, at a distance from one another, curved secondary veins. 



In the Middle Tertiary strata are found leaves of the Castanea atavia 

 closely approaching the Castanea vesca by approximate secondary veins, 

 and by more numerous and protruding teeth, which, however, are still without 

 thorny points. 



In still more recent strata of the Tertiary formation there are found here 

 and there thorny points on the teeth. 



In the latest Tertiary strata the leaves of the fossil species are nearly 

 identical with those of the Castanea vesca. The secondary veins are more 

 approximate and almost rectilinear, while the teeth are set with thorns. 



In all strata where leaves of the Castanea atavia have been found, have 

 also been collected the male catkins of that species, which differ from those 

 of the Castanea vesca by having somewhat smaller flowers. Examples of 

 these are also added to the collection. 



Zz 2 



