170 FIFTEENTH EEPORT ON THE CABINET OF NAT. HISTORY.. 



PLATE 8. 



Fig. 1 & 2. Orthoceras crotalum. 



Fifteenth Report on the State Cabinet, p. 78; Appendix C eont. p. 50. 

 Fig. 1 represents the ordinary form and condition of the specimens. 

 Fig. 2, a variety of the preceding, or perhaps a distinct species, having the 

 direction of the septa and the annulations not coincident. 



Fig. 3 & 4. Orthoceras nuntiijm. 



Fifteenth Report on the State Cabinet, p. 79; Appendix C cont. p. 51. 

 Fig. 3, a cast of an imperfect individual; -f, a fragment preserving the 

 surface markings. 



Fig. 5. Orthoceras exile. 



Fifteenth Report on the State Cabinet, p. 78; Appendix C cont. p. 50. 



Fig. 6. Orthoceras baculum. 



Fifteenth Report on the State Cabinet, p. 74; Appendix C cont. p. 46. 



Fig. 7. Orthoceras emaceratum. A species resembling O. exile ; 

 but the septa are proportionally much more distant, there being 

 three in this one in the space of four in the preceding*. 



Fig. 8. GoMPHOCERAs (Apioceras) conradi. 



Thirteenth Report on the State Cabinet, p. 106.. 



Fig. 9. Aploceras (Cyrtoceras) liratum. 



Fifteenth Report on the State Cabinet, p. 72; Appendix C cont. p. 44. 



* The description of this species should follow that of 0. exile, p. 78 of this Report ( p. 6,0 

 Appendix C, 1861) ; it having been accidentally omitted. 



