Vol T. Grabau Ordorician Fossils from North China (i) 23 



shoulder slopes strongly inward and is gently concave. The inner side of the whorl is 

 rounded with a very faint suggestion of an impressed zone where it was in contact with 

 (lie preceding whorl. The growth lines are squamose and crowded. 



This species is of the type of Ophileta bella Billings which is found in the Beek- 

 mantown (Div P) of Newfoundland. The upper carina is however nearer to the outer 

 margin in the Chinese species and the shoulder more regularly concave. Again, the 

 linos of growth are not squamose on the upper surface of the Chinese species, as they are 

 in the Newfoundland form. On the umbilical side, the Chinese species is marked by a 

 rounded carina near the inner margin, this being absent in the Newfoundland species. 

 On this side too, the growth lines are much more strongly squamose in the Chinese than 

 in the Newfoundland form. Though related, these two forms are markedly distinct. 



HORIZON AND LOCALITY: This species was obtained by Dr. F. F. Mathieu from 

 the Pcilintze or lower limestone of the Lower Ordovician, at Pei-Lin-Tze, Shihmunchai, 

 province of Chihli. It is not an uncommon form. 



Genus ECCYLIOPTERUS Remele 

 Eccyliopterus kushanensis Grabau (sp. nov.) 



Plate II Figs la. - c. 



Shell of medium size consisting of about four volutions, which enlarge gradually 

 and regularly. Spire sunken; umbilical side nearly flat. Whorls of sub-rhomboidal 

 section, the shoulder sloping inward, with a sharp shoulder angle, which was scarcely 

 elevated into the marginal "collar". Shoulder angle of the inner whorls somewhat 

 greater than that of the outer ones, the shoulder itself sloping inward to a lesser degree 

 than in the adult, and being flat, whereas that of the outer whorls becomes slightly concave. 

 The successive whorls embrace to within a very short distance of the shoulder angle, which, 

 however, projects slightly in each whorl. Outer surfaces of the whorls very gently convex, 

 less so in the adult than in the earlier whorls, but not actually flattened. Towards the 

 umbilical side the whorls become regularly rounded, and separated by depressed sutures. 

 On this side the whorls are only very slightly depressed, so that a very large and very 

 shallow umbilicus results. 



This species is related to Eccylioptcms sinensis (Freeh) (Raphistoma sinense 

 Freeh) from southern China. Comparison with a characteristic specimen from Hupeb. 

 (PI. II, fig. 8) shows it to be a flatter as well as larger shell. The whorls of the present 



