new or little-known Goniatites/Vow Ireland. 443 



about as high as wide; indented to about one fifth of its 

 height by the preceding whorl ; periphery broadly convex, 

 imperfectly defined: sides feebly convex, somewhat flattened 



Fiff. 8. 



Pericyclus subplicatilis. — a, lateral view of the tj'pe specimen ; b, peri- 

 pheral view of the earlier portion of the outer whorl of the same. 

 Carboniferous Limestone : St. Doulagh's, Co. Dublin, Ireland. 

 Drawn from an example in the collection of Dr. A. H. Foord, F.G.S. 

 About three fifths natural size. 



near the umbilical margin ; umbilical zone narrow, well- 

 defined, nearly perpendicular to the plane of symmetry of the 

 shell. Body-chamber occupying the whole of the last whorl; 

 aperture not seen, but (judging by the growth-lines and orna- 



Fig. 9. 



w 



r\ 



Pericyclus subplicatilis. — Suture-line. Carboniferous Limestone : St. Dou- 

 lagh's, Co. Dublin, Ireland. Drawn from an example in the collec- 

 tion of Dr. A. H. Foord, F.G.S. Natural size. 



ments) the peristome probably nearly straight on the lateral 

 area, and with a deep and broad hyponomic sinus. Chambers 

 (? depth) ; suture-line as in fig. 9. Test ornamented with 



