74 



THK CHAIN OF LIFE. 



bent {Cyrtoccras)^ others differing in the style of siphuncle, 

 (jr aperture, or chambers {Endoceras^ Gomphocenu^ Liluiks, 



l.^ 



O 



\ 



( 



\ 



\ 



\ 



\ 



I'k;. (jfj — Nautilus Aiioneinia (l»n.). Carh/iiifcrous. 

 a, Shell, reduced, b, Stctiun, showing siphuncle. 



Figs. 67 to 69), or inflated into sac-like forms {Ascoceras). There 

 is, besides, the family of the GoniatidcE (Fig. 70), with the 



SiysSC 



I'JG. 70. — Gonialites cnn'ntria (Philips). Carboniferous. 



chambers thrown into angular folds and the siphuncle at the 

 back. Further, some of the early forms, as the Orthoceratidte. 



