new or h'ttle-knowti Goniatites from Ireland. 439 



semielHptical in section, a little wider than hig-li ; indented 

 to about three eightlis of its height by tlie preceding whorl ; 

 periphery rather broadly convex, imperfectly defined; sides 



Fiff. 6. 



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

 the same. Carbouiferous Liiuestone : 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; umbiHcal 

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

 centre of the umbilicus, and forming an obtuse angle with 

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



Fi?. 7. 



Suture-line of Fericyclus liuilyi. — Carboniferous Limestone : St. Dou- 

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

 example in the coUejtioii of Dr. A. H. Foord, F.G.S. 



feeble somewhat irregularly spaced riblets, which in crossing 

 the whorl pass obliquely backward from the edge of the 



