224 Canadian Record of Science. 



II. Genus Proboscina, Audouin. 



2. Proboscina frondosa, Ulrich. Eecorded from the 

 Ordovician strata of Stony Mountain, Manitoba, and pre- 

 viously recorded in Contrib. to the Micro-Pal. of Canada, 

 Part II., p. 28. 



B. — Cryptostomata, Vine. 



III. Genus Pachydictya, Ulrich. 



3. Pachydictya acuta, Hall, p. 155. 



4. Pachydictya triserialis, Ulrich, p. 159. This form is 

 described " as yet known only from the Trenton limestone 

 of Montreal, Canada." It is figured on Plate X., figs. 11 to 

 14. 



IV. Genus Ptilodictya, Lonsdale. 



Here, Prof. Ulrich classifies the known forms of Ptilo- 

 dictya and gives the following- Canadian species : 

 Section a. — Species without monticules. 



5. P. gigantea, Nicholson, Corniferous, Canada. 



6. P. Canadensis. Billings, Hudson E. group, Canada. 



7. P. gladiola, Billings, H. E. and Anticosti groups, 

 CaDada. 



8. P. (?) sulcata, Billings, Anticosti group, Canada. 

 Section b. — Species with monticules. 



9. P. Whiteavesii, Ulrich, H. E. group, Manitoba. 



V. Genus Escharopora, Hall. 



10. E. recta, Hall, Trenton limestone, Canada. 



VI. Genus Ph^nopora, Hall. 



11. P. incipiens, Ulrich, from the Trenton limestone of 

 Montreal, Canada, where it was collected by the late Mr. T. 

 C. Curry, of the Peter Eedpath Museum. 



VII. Genus Arthropora. Ulrich. 



12. Arthropora bifurcata, Ulrich. A species closely re- 

 lated to if not identical with this is said to have been found 

 in the Trenton limestone of Canada, the precise locality not 

 being indicated. 



VIII. Genus Stictoporella, Ulrich. 



13. Stictoporella exigua. Ulrich. Trenton and Canadian 



