CLASS V 



CEPHALOPODA 



647 



Ol" less conii)letely costated witli several lines of tabercles in specialised shells. Sutures 

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

 internal saddles beconie divided, the internal inflections resemble those of Lecanitinae. 



Fio. 1233. 



Cemtitesnodomsdenmn. Muschelkalk; Wurzburg, Bavaria. yl, 7?, Conch, Vi- a Lcfthalf of suture-line. 

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

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



In primitive forms (OleniMtes) 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 Stephanites. Saddles 

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

 but in some forms the auxiliary line may be extended as 

 in the Meekoceratinae. Occasionally, also, costae may cross 

 the venter as in Sibiritinae. 



Geratites de Haan (Figs. 1233, 1234) ; Danuhites and 

 Balatonites Mojs. ; Reiflincßtes Arthab. Gymnotoceras and 

 Olenikites Hyatt. Type 0. {Bin.) sjnniplicatus (Mojs.). 

 Keyserlingites Hyatt. Type K. (Geratites) subrobustus 

 Mojs. Beyrichites Waagen. Siibgenera : Hollandites and 

 Phülippites Diener. Trias. 



Subfamily B. Tirolitinae Mojsisovics (pars). 



Fig. 1234. 



Cemtitrs (rinodosus Hauer. Mus- 



Compressed, discoidal or involute shells reseml)ling chelkalk; Bakony, Hungary (after 



Dinaritinae in thoir sutures and having entire saddles ' «J^'^omcs). 



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 



