

IV /. Grabau Ordovician Fossils from North China (i) 35 







Family BUCANID^E Ulrich & Scofield 



Genus SALPINGOSTOMA Roemer 

 Salpingostoma terrilli Grabau (sp. nov.) 



Plate II, Figs. lOa - c 



Shell bellerophontoid with rather rapidly enlarging whorls, coiled in a single 

 plane ; the earlier whorls embraced by the later, so as to produce a rather small and deep 

 umbilicus. Outer contour of whorls rounded, except where this is interrupted by the 

 pronounced slit, the sides of which are slightly elevated. Apertural portion suddenly and 

 Haringly expanded into a broad bellerophontoid lip, which extends on all sides of the 

 whorl, and closes the slit in front. Surface markings not preserved. 



The only specimen so far known is crushed on one side and on the front, but 

 shows all the essential characters of the genus. The slit is wider than is usually the case 

 in this genus and its borders arc somewhat thickened. How much of this is due to 

 silicih'cation cannot be stated. 



Compared with other species of this genus, the whorls of this form expand more 

 rapidly and embrace more closely ; thus giving a much smaller and deeper umbilicus than 

 is usually found in this shell. The lip also appears to be broader and more extended than 

 in other species. This genus is well represented in the Stones River (Chazy), and Black 

 River formations of interior North America and in the Trenton of New York and Canada. 

 It also extends into the Richmond group of the highest American Ordovician. The 

 genus is further well represented in the Upper Ordovician of Esthonia (formations 

 Cl, C2andFl) 



Our species is more nearly of the type of those found in the Echinosplnx-ntes 

 limestone (Cl) of Europe and those of the Trenton limestone of America, but is distinct 

 from all of these forms. 



HORIZON AXU LOCALITY: Associated with Lophospira morrisi and Actinoceras tani 

 in the upper Machiakou or Actmoceras limestone of Tangshan, province of Chihli. At 

 pivscnt represented by only one specimen. Collected by Messrs. Morris, Terrill and 

 Barbour. 



Holotype in the collection of the Chinese Geological Survey, Cat. No 32. Named 

 after Mr. Arthur C. Terrill, Professor of mining in Peiyang University, the discoverer of 

 the specimen, 



