7ieio or little-known Gomni'itcs from Ireland. 443 



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

 heiglit by the preceding whorl ; periphery broadly convex, 

 imperfectly defined : sides feebly convex, somewhat flattened 



Pen'et/clt(s suhplicatilis. — a, lateral view of the tj-pe specimen ; b, peri- 

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

 Carboniferou3 Limestone : St. Duulagh'.'^, Co. Dublin, Ii'eland. 

 Drawn from an example in the collection of Dr. A. 11. Foord, F.G.S. 

 About three fifths nataral 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. 



Pericydus subpUcatilis. — Suture-line. Carboniferous Limestone : St. Dou- 

 iagh's, Co. Dublin, Leland. Drawn from an example in the collec- 

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



nients) 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 



