Vol I. Orabau — Ordovician Fossils from NotUl Clrina (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 

 the preceding whorl. The growth lines are squamose and crowded. 



This species is of the type of Ophi.leta 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 

 lines of growth are not squamose on the upper STirface of the Chinese species, as they are 

 in the Newfoundland form. On the umbilical side, the Chinese species is marked l).y a 

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

 On this side too, the groMdh 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 Peilintze 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 I£ Fjgs 7a- 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 in^A'ard to a lesser degree 

 than in the adult, and being flat, whereas that of the outer M'horls becomes shghtly concave. 

 The successive whorls embrace to ^vithin a veiy short distance of the shoulder angle, which, 

 however, projects shghtly in each wliorl. 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 shghtly depressed, so that a very large and very 

 shallow umbilicus results. 



This species is related to Eccyliopterus sinensis (Freeh) (RapMstoma sinense 

 Freeh) from southern China. Comparison with a characteristic specimen from Hupeh, 

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



