Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig- 

 Fig. 

 Fig. 

 Fig. 



PLATE XXXIII. 



PAGE. 



Orthoceras (Cycloceras), Nova-Carusi<Ense, Foerste 545 



View of interior cast. B. O. 



Orthoceras (actinoceras) ci^avatum Hall 538 



View of the interior cast, B. O 



Orthoceras (actinoceras) youngi Foerste 537 



A vertical section showing the siphon on one side. H. I. 



Orthoceras (actinoceras) lata-nummulatum Foerste 538 



A vertical section through the siphon. S. H. O. 



Orthoceras (cyci,oceras) amycus Hall -546 



A badly preserved exterior. B. O. 



Orthoceras (actinoceras) daytonense Foerste 539 



A vertical section passing through the siphon. S. H. O. 



Orthoceras (actinoceras) turgido-nummuIvATUm Foerste'. 538 



A.vertical section passing through the siphon. S. H. O. 



'Gomphoceras ortoni Foerste 533 



u. A side view of the living chamber, b. A transverse section of the same near the 

 last sepUum. B. O. 



