PAL/EONTOGRAPHICAL SOCIETY, 1912 



Lake, Cambrian Trilotites. 



PLATE IX 



ja^^N&^B*- 



3X4 



IX 4 





4X4 



5X4 



8X4 







6X6 



7X4 



•*•* 



9X4 



CTENOPYGE 



4. Brock, <3el. 



London Stereoscopic Co. Iir 



