(ll) 6S 



Palseontologia Sinica 



Ser. B. 



Horizon and Locality: From a polished slab on the pavement along the road 

 from Cha-ti-pu to Chang-chia-chiao, Hsien-ning-hsien, where the country rock is grey 

 thin-bedded limestone corresponding to the reddish limestone in Chung-yang. 



1917. 



1928. 



Family CYCLOCERATIDAE Hyatt 



Genus ProTOCYCLOCERAS Hyatt 



Protocycloceras deprati Reed 



Plate VI., Figs. 4a-b, and 5. 



Orthoceras {Protocycloceras?) deprati, Reed: Palseontologia Indica, New Ser. 



Vol. VI, Mem. No. 3, p. 33, pi. V, fig. 15. .. 

 Protocycloceras (?) deprati, Kobayashi: Japanese Journal of Geology and 



Geography, Vol. V, No. 4, p. 184, pi. XIX, fig. 5. 



Fig. 7 



Fig. 4 Fig. 5 



Fig. 4. Protocycloceras deprati. Front view of an internal mould, showing the anniialations. 

 Natural size. 



Fig. 5. Protocvcloceras deprati. Side view of the same. Natural size. 



Fig. (>. Protocycloceras deprati. End view of the same, showing the eccentric siphuncle. 

 Natural size. 



Fig. 7. Protocycloceras deprati. Portion of the test of another smaller individual. Fnlamed 

 five times. 



This species is represented by numerous specimens, which are all internal moulds 

 but belong to the same species. In taking the longitudinal section the interior of the 

 specimen is wholly empty without any trace of the internal structures. Nevertheless, 

 the characteristic surface annulations and the position of the siphuncle are cleary shown 

 on the exterior of the moulds. 



