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Additional resources for Die fossilen Tintenfische. Eine paläozoologische Monographie. Fossil dibranchiate cephalopods. Band 5
B u t s e e a l s o t h e forthcoming critical presentationin Cephalopoda,vol. I, chapter38). It is noteworlhy that strong similarity to the teuthoidsexistsin many organs(Fig. 39). tu. For example,the differentiationof I the tentaculararms is strikingly similar in all the living Fig. 12. - Belentnosellaantericana (Meyer and Aldrich). decapods(Cephalopoda, vol. I, p. I 15, 119),in contrast Reconstructedfrom the original authors' figures (Pl. 2, Fig. (Fig. 91). families, 26 and26a). (My reconstructionsshown by dotted lincs); nat.
Pirulirostra. 'haracteris the almost completespiral coiling. This iannot be explainedsimply by recalling the derivation trf nautilids from straight tetrabranchiates. There is an rrndeniablesimilarity betweenSpirula and Gyroceras. However,in the latter the early chambersturn upwards, rvhereasin Spirula they turn downwards.
I, chapter 38), (63) it might be the prototype of all the living sepioids. Of special interest is the fact that the genus contains several species which, from a state reminiscent of Belemnosella, appear to gradually approach the derived sepiid type. a) Spirulirosta bellardii d'Orb. 1842. (cf. Bellardi,Moll. Ter. Terz. Del Piemontee Liguria I, p. P l . bellardiid'Orb. ,p. 11,Figs l-6). bellardiid'Orb. ,Pl. 9. p. 295). S p . b e l l a r d i i d ' O r b . 1 8 4 5 ( M o l l . v i v . f o s s . ,p .