1202 



Ni:\V VOKK STATI-: MUSEUM 



Fi|?. 139 T e n t a c u 1 i t e s 

 s c a 1 a r i f o r ra i s 



Fig. HO Gyroceras trivolve 

 (dorsal and ventral views) 



l-'ig. 141 (iyr()f(M-us tri\ olve (side view) 



