AMMONoihKA 



561 



auxiliaries. Ventral lol.e in some form.-, similar to that in '/'//,</// /'//,/, . and mode of 

 generation of adventitious inflection.- in /'/,/,-//..< j- 

 the same as in T!l,,-t!H,l,i, . that in rfimrncercu in 

 unknown. 



Plaritet, Bambaganiteg, /'///-/////> Fiu r - I l l'., 

 1150), Mojs. Trias 



Family 19. Choristoceratidae. Discoidal 

 ammoiiil icones in primitive form-, heroming un- 

 coiled phylogeron-. and finally even complete 

 bartilitii-oiies in the most specialised species. 

 Sutures also phylogerontir, having only six entire 

 or very faintly denticulated loin-sand six entire 

 saddles. Ventral lobe divided, and the ariti- 

 siphonal either entire or bifid at its extremity. 

 Dorsal lobe* and saddles otherwise entire. Con- 

 nected through /W//n/(7/.s with Jlm-ln'tr*, according 

 to Mojsisovies. 



Polycyclus (Fig. 1151), Peripleurites, M<js. ; 

 Choristoceras (Fig. 1152), Rhabdoceras (Fig. 1153), 

 Hauer. Trias. trta ; Ettthetatato, new Aussee, Austria." 



Family 20. Cochloceratidae. Turriliti- 

 cones with costae similar to those of preceding family, but more or less asymmetrical 



AdL 



Fio. 1150. 



Pinacoceras Metternichi, Hauer sp. Kt-uiit-r; Sunienuikn-cl, near Hallstadt, Austria. Suture-line rHliu-i-.| 

 (after Haut-r). 



in consequence of the asymmetry of the spire*. Lobes reduced to four in numl>er. 



Fin. 1151. 



Polycychis nastur- 

 f : ".in, i)ittinar sp. 

 Keuper ; Sandling, 

 near Aussee. 



Km. 11. VJ. 



Choristoceras Afarshi, 

 Hauer. Rhaetic; Kendel- 

 engraben am Osterhorn, 

 near Salzburg. 



Fi;. 1153. 



HIliilnliH-'T"- - 



Hauer. Keuiwr ; 

 Sandling, near 

 Aussee (after 

 Hauer). 



. 1154. 



Cochl* 

 Hauer. Sandling, 



iii-ur AMSSI-I' (after 

 Haii.-r). 



and there are other phylogerontic suppressions. Funnels monochoanitic, collars 

 absent. 



Cochloceras, Hauer (Fig. 1154); Paracochloceras, Mojs. Trias. 

 VOL. I 2 O 



