CEPHALOPODA 



653 



1253. 



Lytoceras liebicji (Oppel). Tithonian 

 Straraberg, Moravia. 



in tlie ontogeny of phylogerontic forms, 

 and fmally straight in some genera. 

 Antisiphonal lobe sliort, and in some 

 genera trifid. Shells have constrictions 

 and large costae at intervals, but no 

 tubercles at any stage. 



Macroscaphites Meek (Fig. 1255) ; 

 Leptoceras, Costidiscus Ulilig ; Tropaeiim 

 Sowb. ; Hamites Parkinson (Fig. 1256); 

 Ptyclwceras d'Orb. (Fig. 1257); Di-pty- 



i^tin 



Fig. 1254. 



Alocolytoceras germainei (d'Orb.). 

 Upper Lias ; Pinperdu, near 

 Salins, Jura 



Fic. 12Ö5. 



Macroscaphites ivanii (d'Orb.). 

 Upper Neocomian ; Malleuewitz, 

 Carpathia. 



Fio. 1256. 



Hamites rotundatus (Sowb.). 



Gault ; Folkestone. 



Fic. 1257. 



Ptychoceras puzo- 

 sianum (d'Orb.). 

 Barremian ; Vergons, 

 Basses Alpes. 



