CEPHALOPODA 



653 



Fici. 1253. 



Lytoceras liehigi (Oppel). Tithonian ; 

 Stramberg, Mora\'ia. 



in the ontogeny of phylogerontic forms, 

 and finally straight in some genera. 

 Antisijjhonal lobe short, and in some 

 genera trifid. Shells have constrictions 

 and large costae at intervals, but no 

 tubercles at any stage. 



Alacroscaphites Meek (Fig. 1255); 

 Leptoceras, Costidiscus Uhlig ; Tropaeum 

 Sowb. ; Hamites Parkinson (Fig. 1256) ; 

 Phjchoceras d'Orb. (Fig. 1257) ; Dijify- 



h'ui. 1264. 



Alocolytoceras gennainei, (d'Oii^.). 

 Upper Lias ; Pinperdu, near 

 Salins, Jura 



Fici. 1255. 



Maeroscaphites ivanii (d'Orb.). 

 Upper Neocomiaii ; Malleuewitz, 

 Carpathia. 



Fio. 1256. 



Hamites rotunilatus (Sowb.). 

 Gault ; Folke.stoue. 



Fin. 1257. 



Ptychoceras jmzo- 

 sianum (d'Orb.). 

 Barremian ; Vergons, 

 Basses Alpes. 



