432 



HISTORICAL GEOLOGY 



Fig. 403. — Ordovician brachiopods : A, Orthis tricenaria; B, Raphinesquina 

 alternata; C, Lingula rectilateralis ; D, Plectambonites sericeus ; E, Trematis ottawcensis ; 

 F, Leptcena rhomboidalis ; G, Platystrophia lynx; H, Rhynchotrema capax; I, Dal- 

 manella testudinaria; J, Hebertella borealis ; K, Str'ophomena rugosa; L, Schizocrania 

 filosa; M, Zygospira recurvirostris. 



D ~ E 



I i'.. 404. — Ordovician bryozoans : /I, Escharopora subrecta; B, Corynolrypa inflaia 

 (enlarged); and the same, C, in its natural position and size on a brachiopod; 

 /;, Callopora pulchella; E, Constellaria florida. 



