364 PROF. S. H. REYNOLDS AND DR. A. VAUGflAN ON [Aug. 191 1 , 



Horizon {3 (base of ZJ. 



Corals : — 



Michelinia favosa (Goldf.) de Kon., mut. (3. Tall, narrow equal coral- 

 Amplexus coralloides Sow. lites. 



Zaphrentis delanouei E. & H., Carruthers ; and var. Common. 

 Zaphrentis cf. parallel a Carruthers. Rare. 



Brachiopods : — 



Productus burlingtonensis Hall, mut. (3, Vaughan. 



Spirifer clathratus M'Coy, Vaughan. Abundant ; the average dimen- 

 sions smaller than in Z. 



Spirifer ventricosus de Kon. 



Syringothyris typa Winchell. Hall. Represented by small and large 

 forms. 



Syringothyris cf. texta Hall. 



Athyris /3, Yaughan. 



Leptcsna. 



Orthotetes. 



Zaphrentis delanouei, to the practical exclusion of other species, is 

 diagnostic of the level j3 throughout the South.- Western Province ; 

 it disappeared from that province in early Z time, never to return. 

 The history of the gens in the Scottish Province was, however, 

 coextensive with Avonian time, and has been dealt with by 

 Mr. Carruthers in a recent paper. 1 



Zaphrentis vaughani Douglas has not yet been found in any part 

 of Z in the South- Western Province — a remarkable fact, in view of 

 the abundance of the species in Lower Z throughout the Belgian 

 Province, and of its occurrence in beds of that age in County 

 Clare. 2 



Z,: 



Corals : — 



Syringopora 9 Vaughan. 



Michelinia favosa (G-oldf.) de Kon. 



Zaphrentis delanouei E. & H., Carruthers. Rare. 



Zaphrentis omaliusi E. & H., Carruthers. Typical form onlj- ; common. 



Brachiopods : — 



Productus burlingtonensis Hall, mut. (3 Yaughan. 



Productus aff. pustulosis PhilL, early mut. Small forms ; the earliest 



record is from /3 of the Avon section. 

 Productus cf. semireticulaius (Martin). 

 Productus cf. niger G-osselet : a species allied to P. bassus Vaughan. 



Rare. 

 Chonetes cf. hardrensis Phill. 1 as interpreted in the 



Chonetes cf. laguessiana de Kon., Vaughan. > i Bristol Paper.' 

 Chonetes cf. crassistria M'Coy, Vaughan. J Very common* 

 Orthis michelini (L'Eveille) Davidson. 

 Orthotetes sp. : the common Z form. 

 Leptcena analoga (Phill.). 

 Spirifer clathratus M'Coy, Vaughan = Spirifer tornacensis de Kon. 



Very abundant ; increasing in size. 



Carruthers IV.' 



The Carboniferous Limestone of County Clare (Ireland)' Q. J. G>. S. 



vol. lxv (1909) pp. 549, 577, etc. 



