I860,] 0/1 the Devonian Fossils of Devon ^ Cornwall, 265 



Mr. Pengelly then proceeded to, what may be called, the statistical 

 part of his subject,* remarking that the tables at present before us 

 must be regarded as merely representing our momentary knowledge, 

 as in all probability many new fossils would be hereafter discovered ; 

 the figures however would probably always express tolerably exact 

 proportions or relative numbers. 



The following is a brief summary of this part of the discourse. Of 

 the 27 classes into which the existing Flora and Fauna are divided, 

 15 only are represented by the fossils of the Devonian rocks, whether 

 found in Britain or elsewhere in the world ; as is shown in the follow- 

 ing table ; — 



Represented Classes. 



Cellulares.* 



* Monocoty ledones. ♦ 

 Amorphozoa. 

 Zoophyta. 

 Echinodermata. 



* Annelida.* 



* Cirrepedia.* 

 Crustacea. 

 Bryozoa. 

 Brachiopoda. 

 Lamell ib ranchiata. 



* Pteropoda.* 

 Gasteropoda. 

 Cephalopoda. 

 Pisces.* 



Unrepresented Classes. 



Dicotyledones. 



Infusoria. 



Foraminifera. 



Entozoa, 



Acalephae. 



Myriopoda. 



Arachnida. 



Insecta. 



Tunicata, 



Reptilia. 



Aves. 



Mammalia. 



Those printed in italics appear to have been poor in species. It 

 must be remembered, however, that some of them are similarly cha- 

 racterized in the existing creation ; the classes in capitals contained a 

 greater number of species then than they do at present ; those pre- 

 ceded by an asterisk do not appear to have been met with in Devonian 

 rocks in any part of the British isles, and those succeeded by the same 

 mark, are not recorded as having been found amongst the Devonian 

 fossils of Devon and Cornwall. The district last named has yielded 

 •340 species, of which 60 are also found in Continental Europe, 6 in 

 America, and 1 in New South Wales. Seven of the 340 species appear 

 to have existed in the preceding or Silurian age, whilst about 60 

 passed over to the next, or Carboniferous, period. Many of the fossils 

 of Devon and Cornwall appear to have had a very limited geographi- 

 cal range; thus 186 species, more than half the entire series, are 

 peculiar to South Devon, whilst there is but one common to the con- 

 temporary deposits of North and South Devon and Cornwall, and not 

 more than six common to any two of them. 



Mr. Pengelly then proceeded to give a brief description of some 

 of the classes. There are, he thinks, many more species of sponges in 



1 This part of the discourse was illustrated with tables suspended on the walls, 

 which the speaker had compiled from the writings of Bronn, Professor Morris's 

 Catalogue of British Fossils, and the Monograph of the Palajontographical Society. 



