Vol. 6 7. J THE AT0H1AN OF BUERINGTON COMBE. 365 



Syringothyris cf. texta Hall. 



Reticular ia aft', lineata (Martin) Vaughan : the Z form. 



Athyris aft', glabristria (Phill.) Vaughan : lentiform. Common. 



[Fishes : — Oracanth us spine. Psam modus tooth.] 



Spirifer clathratus is as abundant at this level in the South- 

 Western Province as it is in Belgium. 



i On the other band, Athyris glabristria is, in the Belgian Province, 

 almost entirely replaced by A. lamellosa. 



Z 2 : 



Corals :- — 



Syringopora 9 Vaughan, and a narrower variant. 

 Michelinia favosa (Goldf.) de Kon. : walls much thickened. 

 Michelinia konincki, nom. nov., including Rhizopora tubaria de Kon. 

 Michelinia megastoma (Phill.), mut. Z 2 . Cleistopora - like aspect. 



Common. 

 Zaphrentis omaliusi E. & H., Carruthers, and its variant — Zaphrentis 



densa Carruthers. 

 Zaphrentis konincM E. & H., Carruthers : long narrow form . Abundant, 



and diagnostic of the subzone. 

 Endophyllum burringtonense, sp. nov. (See p. 377.) 

 Caninia cornucopia Mich., Carruthers. Common ; small. 

 [Two rare species determined by Mr. Carruthers as Lophophyllum 



cf. tortuosum (Mich.) and Amplexus cf. spinosus de Kon.] 



Brachiopods : — 



Productus aff. coi-a d'Orb. [Recorded by Dr. T. F. Sibly.] Very rare, 



Orthis raichelini (L'Eveille) Dav. Common. 



Orthis rcsupinata (Martin). Very rare. 



Orthotetes sp. : the common Z form, and a variant with stronger 



ornament. 

 Spirifer clathratus M'Coy, Vaughan. ]Sot common. 

 Syringothyris laminosa (M'Coy) (Dav.) : small form. Common. 

 Athyris aff. glabristria (Phill.) Vaughan : Z 2 form. 



Caninia is now firmly established, although as yet represented 

 only by small forms belonging to the typical cornucopia section ; 

 the truly vesicular groups are absent. 



Zaphrentis densa is gradually replacing the more typical form of 

 Z. omaliusi. 



The Devonian coral, Michelinia favosa, finally disappears at the 

 top of Z 2 , and its place is taken by the earliest members of the 

 megastomatid group — small, fiat, plate-like ancestors with few 

 corallites. 



Dr. Sibly's record of Productus aff. cora is the earliest occurrence 

 at Burrington of this very long-lived gens. In the Bristol area 

 this early mutation is well known, and in the Forest of Dean the 

 history is pushed back at least as far as (3 ; forward, the gens can 

 be traced into the Permo-Carboniferous. 



