34 



ART. ?. H. YABE I CPvETACEOrS 



is composed of six volutions, the inner ones sliowing" a wide 

 umbilicus and very inflated wliorls wliicli are broader than high, 

 and strikingly resembling G. tenuiliratum of the same size. All 

 the whorls become gradually higher as they grow, so that their 

 height and breadth become almost equal, showing a nearly square 

 cross-section when the shell measures 5 cm. in diameter. The 

 ventral side is round and broad. 



In other respects, that is, in its shape, sui'face markings and 

 the suture line, it does not show any appreciable difference from 

 the normal type of the species. The septal lobe is l)eantifully 

 preserved, as shown in fig. G c, PI. IV. 



Locality and Horizon : — Pachydlscus-lmh of the Uipets- 

 rubeshibe, a tri])utary of the Fipets, Pi-ov. Tcsliio. 



GROUP OF GAUDRYCERAS LIMATUM. 

 GAÜDRYCERAS LIMATUM .m. 



PI. IV., fig. 2; PI. v., fig. 2: PI. VI., figs. 3 a, b. 



Of the many specimens of Ammonites refei'able to the present 

 species and its varieties, one half are provided with whorls of 

 the adult stage, although in a moi'c or less deformed state. 



Dimensions : — 



