Order XVIIL RUDISTA. 

 No genera monographed. 



Sub-Branch MOLLUSCOIDEA. 



CLASS D. TUNICATA. 



Order XIX. SACCOBRANCHIA. 



Order XX. DACTYLOBRANCHIA. 



Order XXI. T.ENIOBRANCHIA. 



Order XXII. LARVALIA. 



No genera monographed. 



CLASS E. BEACHIOPODA. 



Order XXIII. ARTHROPOMATA. 



Terebratula and Khynchonella 51 11 13 299 



