TRILOBITA—OPISTHOPARIA. 



269 



Fig. 1561. Paradoxides davidis, half 

 grown individual, X X> showing part of 

 hypostoma bent upwards. (After Salter, 

 Quart. Journ. Geol. Soc, XX., a Euro- 

 pean example.) 



Fig. 1562. Paradoxides 

 davidis, normal type of py- 

 gidium, X yi' (After Salter, 

 Quart. Journ. Geol. Soc, XX.) 



Fig. 1563. Paradoxides forchhammeri, 

 outline^of a European example. (After Salter.) 



Fig. 1564. Rei7iopleurides cana- 

 densis: a, b, cephalon, X 2 ; <:, last 

 thoracic segments and pygidium, X 4- 

 (After Raymond.) 



