670 



MOLLUSCA 



PHYLUM VI 



youtliful whorls are coiled spirally in a plane ; at maturity the whorl straightens out 

 temporarily, often bending back again in a hook-sliaped body -Chamber. 



Fig. 13G5. 



Spiroceras bifurcatum (Quenst.). Upper Dogger (Cal- 

 lovian) ; Ehningen, Würtemberg. A, Shell with protoconch 

 broken away, i/j. B, Portion of venter. (', Suture-line. 



Fio. 1306. 



Ancyloceras matheronianum d'Orb. Neocomian ; 

 Castellane, Basses Alpes. A, Concli. U, Suture- 

 line. 



Spiroceras Quenstedt (Fig. 1305), Lower Oolite, supposed to be derived from 

 Parkinsonia. Grioceras Leveille ; ^.wc^Zoceras d'Orb. (Fig. 1306). Cretaceous. 



Subfamily E. Scaphitinae Meek. 



Whorl close-coiled in youth, opening out at 

 maturity into a hook- 

 shaped body - Chamber. 

 Form robust, tliick-set, 

 involute, surface highly 

 ornamental with ribs 

 and knots. Septa finely 

 digitate, usually with 

 several auxiliary lobes. 



Scaphites Parkinson 

 (Figs. 1162, 1307, 1308); 

 Fin. 1308. Discoscaphites Meek ; 



rfZnÄn,-"''^''''^'T, ^°'^^- Jahnites Hyatt. Greta- 



i^enonianian; Ronen ^ 



France, l/i- ceoUS. 



Fir„ 1307. 



Scaphites spiniger Schlüter. Upper Greta 

 ceous (Senonian) ; Coesfeld, Westphalia. 



