cl:^.ss V 



CEPHALOPODA 



647 



or less completely costated with several lines of tubercles in specialised shells. Sutures 

 in the young and in primitive genera have a magnosellarian aspect, but when the broad 

 internal saddles become divided, the internal inflections resemble those of Lecanitmae. 





Kic. 1233. 



Cn-atitefnodosnxde Haan. Muschelkalk ; Wurzburg, Bavaria. .4, B, Conch, 1/3. C, Left half of suture-line. 

 D First and second lateral saddles and auxiliaries to left of line of involution (n) ; half of dorsal suture-line to 

 right. (AL, Antisiphonal lobe ; other lettering as in Figs. 1145, 1146.) 



In primitive forms (Olenikites) the saddles are broad and very shallow ; lobes entire, 

 and ventral lobe divided by a larviform siphonal saddle, which is sometimes entire. 



The large nodes and stout volutions of primitive 

 forms indicate parallelism with Sfephanites. Saddles 

 and lobes have the typical ceratitic outlines, as a rule, 

 ))ut in some forms the auxiliary line may be extended as 

 in the Meekoceratinae. Occasionally, also, costae may cross 

 the venter as in Sibiritinae. 



Ceratites de Haan (Figs. 1233, 1234); Danubites and 

 Balatonites Mojs. ; Beiflinyites Artlial). Gymiiotoceras and 

 Olenilcites Hyatt. Type 0. (Din.) sinni-plicatus (Mojs.). 

 Keyserlingites Hyatt. Type K. (Ceratites) subrobustus 

 Mojs. Beyrichites Waagen. Subgenera : Hollandites and 

 Phillippites Diener. Trias. 



Subfamily B. Tirolitinae Mojsisovics (pars). Fm. 1234. 



Ceratites fri)iorfos!(s Hauer. Mus- 



Compressed, discoidal or involute shells resembling chelkalk ; Bakony, Hungary (after 



i ' ^ Moisisovics). 



Dinaritinae in their sutures and having entire saddles 



and slightly denticulated lobes. Ventral lobe may remain entire until a late stage 



in some forms, but as a rule it is divided, and the siphonal saddle is small and often 



