Figure 38 Canadian and Ordovician fossils. Canadian, A-F, L-M. 

 (Graptolites, A-K ; gastropods, L, M ; cephalopods, N, 0). A Dictyonema 

 flabclliforme, xJ4. B Didymograptus bifidus, x l / 2 . C Tetragraptus fruc- 

 ticosus, y.Vi. D Phyllograptus angustifolius. E Phyllograptus typus, 

 restored cross section. F Goniograptus thureaui, xyi. G Glossograptus 

 quadrimucronatus <= Diplograptus pristis), xyi. H Colony of the same 

 restored. / Climacograptus spinifer. J Dicranograptus spinifer. K Clitna- 

 cograptus bicornis. L Ophileta complanata, xJ4. M Eccyliomphalus lithui- 

 formis, xl/3. iV Shroederoceras catoni, xl/3. Protocycloceras lamarcki, 

 x'/ 2 . 



