new or little-known Goniatites from Ireland. 



439 



seniielliptical in section, a little wider than high ; indented 

 to about three eighths of its height by the preceding whorl ; 

 periphery rather broadly convex, imperfectly defined ; sides 



Fie:. 6. 



Pericyclus Baihji. — a, lateral view of the type specimen ; b, front view of 

 the same. Carboniferous Limestone: St. Doulagh's, Co. Dublin, 

 Ireland. Drawn from an example in the British Museum Collection 

 [C. 298]. About three fifths natural size. 



feebly convex, flattened near the umbilical margin ; umbilical 

 zone well defined, narrow, feebly convex, sloping towards the 

 centre of the umbilicus, and forming an obtuse angle with 

 the side. Body-chamber occupying the whole of the last 

 whorl ; aperture not seen, but peristome (judging by the 

 lines of growth) probably almost straight on the lateral area 

 and with a deep and broad hyponomic sinus. Chambers 

 (? depth) ; suture-line as in fig. 7. Test ornamented with 



Fig. 7. 



Suture-line of Pericychts Baibji.— Carboniferous Limestone : St. Dou- 

 lagh's, Co. Dublin, Ireland. Drawn of the natural size from an 

 example in the collection of Dr. A. II. Foord, F.G.S. 



feeble somewhat irregularly spaced riblets, which in crossing 

 the whorl pass obliquely backward from the edge of the 



