564 Notices of Memoirs — Mr. Gardner's Report. 



used, acting as an extra condenser, concentrating the light upon the 

 rock-section, and causing it to pass through the polariser and the 

 analyser. A little adjustment of the light was required to get it 

 well through both polariser and analyser, but this with a little care 

 was soon done, and a bright picture several feet in diameter was 

 projected upon the screen, showing the crystals well defined, and 

 exhibiting very strikingly the changes of colour, etc., characteristic 

 of the crystals when viewed by polarised light, and in such a manner 

 as to be well seen by a number of people at once, and also allowing 

 the lecturer to readily point out any particular crystal or crystals to 

 which he desires to draw the attention of his audience. 



As the optical axes of the lantern and microscope did not coincide, 

 the lantern was placed on a board provided with four levelling 

 screws with which the necessary adjustments were readily made. 



Much better effect may be got if the " Joblowsky " form of prisms 

 made by Zeiss are used instead of the usual Nicols prisms, on account 

 of their greater aperture and shorter length. 



VI. — The Permian Fauna of Bohemia. By Prof. Dr. Anton 

 Fkitsoh, Director of the Eoyal Bohemian Museum in Prague.^ 



PEOF. Dr. Anton Fritsch, of Prague, Bohemia, read a paper on 

 the Permian Fauna of Bohemia. After having mentioned the 73' 

 species of Laby rinthodonts, of which he has given figures in his 

 work "Fauna der Gaskohle," and of which he exhibited the electro- 

 types and restored models in the galleries of the Owens College, he 

 communicated the discovery of a very peculiar genus Naosaurns 

 (Cope). He then explained some unpublished plates of Ctenodus, 

 Orthacanthus, Hexacanthus, and a new Ganoid Fish, Trissolepis with 

 three kinds of scales. He proved Acanthodes to be very near to 

 Selachians, and lastly he drew attention to the gigantic fish (.4m- 

 blypterus) 113 cm. long exhibited in the galleries. 



YII. — Eeport on the Fossil Plants of the Tertiary and 

 Secondary Beds of the United Kingdom. By J. S. Gardner, 

 F.L.S., F.G.S."' 



THE small balance carried forward from last meeting has been 

 expended in visiting the localities in which fossil plants have 

 previously been met with. The beds near the Pier at Bournemouth 

 seem more than usually inaccessible, but a fall from the cliff has 

 brought down some of the dark claj'S, and in these were parts of 

 a large feather Palm and other leaves. I was fortunate enough, 

 however, to secure at the west end of the cliffs a new species of 

 Acer and a fine leaf of Dryandra acutiloba, really a Myrica, a rare leaf 

 at Bournemouth, and one of the few that extend upward from the 

 Lower Bagshot into the Bournemouth horizon. 



I have again visited Alum Bay, but the pipe-clay on the shore 

 has become still more diminished, and there is no hope that any 

 more fossil plant-remains will be obtained there in our time. No 

 distinct plant-remains are obtainable from the same horizon at 



^ Abstracts of papers read before the British Association, Manchester, Sept. 1887- 



