Preside7ifs Address. 363 



Museum." In his "Monograph on British Fossil Sponges," ^ he 

 classifies the work already done by Nicholson and Etheridge, 

 and Messrs Young and Young, and makes plentiful use of 

 material from the Carboniferous rocks of Fife and the west 

 of Scotland, collected by the late James Bennie, the late 

 Dr John Young, John Smith, and the late Dr Hunter- 

 Selkirk, as well as from the older rocks by Professor Lap- 

 worth and the late H. A. Nicholson. He describes three 

 species belonging to as many genera of Monactinellida, three 

 species coming under two genera of Tetractinellida, four 

 species ranged under four genera of Lithistida, five species 

 belonging to four genera of Hexactinellida, and one species 

 of Calcispongida. 



During the progress of the Geological Survey in the 

 north-west Highlands, specimens of fossil sponges were 

 obtained from the Durness Limestone, and placed along with 

 the genera Archceocyathus and Calathium of Billings, from 

 the close resemblance to his Archceocyathus wAnganensis} 



In 1889 Dr Hinde made use of these specimens for his 

 paper on ArchceocyatJms minganensis of Billings, which he 

 showed did not belong to ArchceocyathuSy but must be con- 

 sidered as a Lithistid sponge, to which he gave the generic 

 name of Archceoscyphia.^ 



Several species of Archceoscyphia, Calathium, and other 

 sponges have also been discovered in the Cambrian lime- 

 stones of Skye.* 



EHABDOPHOEA. 



A few new species of Graptolites have been described by 

 Miss EUes from Scottish material. Among these may be 

 mentioned Cephalograptus petahcm, Elles, and Petalograptus 

 minor, EUes.^ The geological significance of the finding of 

 the Graptolites of the Arenig zone, near Ballantrae, by 



1 "Mon. Brit. Foss. Sponges," Palceontogr. Soc, 1887-88. 



^ Quart. Jour. Geol. Soc, vol. i. p. 401, 1888. 



3 Quart. Jour. Geol. Soc, vol. xlv. p. 125, 1889. 



* Mem. Geol. Sur., "Summary of Progress, 1898," p. 55, 1899. 



•^ Quart. Jour. Geol. Soc, vol. liii. p. 186. 



