new or little-known Goniatites from Ireland. 



415 



but its inner whorls are less inflated, its umbilicus wider, its 

 umbilical margin more prominent, and the umbilical zone of 

 its outer whorl wider than in that species. 



Horizon and Locality. Both examples that I have seen 

 are from the Carboniferous Limestone of St. Doulagh's, 

 Co. Dublin, Ireland. 



Olyphioceras cordatum, sp. n. (Figs. 10, 11.) 



Sp. char. Shell discoidal, inflated, rather narrowly umbili- 

 cated ; greatest thickness at a short distance from the umbilical 

 margin, a little more than one half of the diameter of the shell ; 

 height of outer whorl a little less than one half of the diameter 

 of the shell. Whorls (? number) ; inclusion about five sixths ; 

 umbilicus deep, with angular margin and steep sides, about 



Glyphioceras cordatum. — a, lateral view of the type specimen ; the last 

 septum is seen near the commfeucement of the outer whorl. Carbon- 

 iferous Limestone : Little Islaud, Cork, Ireland. Drawn from an 

 example in the collection of Dr. A. H. Foord, F.G.S. About three 

 fifths natural size. 



one fourth of the diameter of the shell in width. Whorl 

 cordate in cross section, a little wider than high ; indented 

 to nearly one half of its height by the preceding whorl ; 

 periphery narrowly convex and imperfectly defined by an 

 obtuse ridge on each side, becoming acute near the aperture 

 of the shell ; sides feebly convex, with an obtuse ridge at 

 Ann. & Mag. N. Hist. Ser 7. Vol. iii. 33 



