184 BRITISH AVONIAN CONODONT FAUNAS 
platform, the most posterior node being the smallest of the six exposed on the 
broken specimen. 
Polygnathus bischoffi sp. nov. 
Plate 13, figs. 8a—11¢ 
1957 Polygnathus inornata E. R. Branson ; Bischoff: 42, Pl. 2, figs. 17, 18, 20, 21. 
1959 Polygnathus cf. flabella Branson & Mehl ; Voges (partim) : Pl. 34, fig. 11 only. 
1964 Polygnathus inornata E. R. Branson ; Higgins : 225, fig. 4, Pl. V, fig. 29. 
DERIVATION OF NAME. After Dr. G. Bischoff. 
Diacnostis. Arrow-shaped platform ; widest in anterior half, tapering to pointed 
posterior. Unit usually slightly arched in lateral view. Platform ornamented by 
delicate ribs, confined to margin. Platform margin upturned in anterior half. Small 
basal cavity, circular in outline, with thickened lips, situated anteriorly. 
MATERIAL. 64 specimens : Holotype X 349, Paratypes X 350, X 351, Hypotype 
X 352 (all figured). 
TYPE LOCALITY AND HORIZON. South Wales Coalfield. Sample SCC, C Zone, Fall 
Bay, Gower. 
Rance. Avon Gorge C 11-C 24. 
Description. The platform is arrow-shaped, with a straight to slightly curved 
axis. In lateral view the unit is arched. The platform is widest anteriorly, and at 
Oral surface 
_ Platform 
Anterior blade 
POSTERIOR 
ANTERIOR 
LATERAL VIEW 
Outer side 
Ril Platform 
' 
P Cavit 
Plattorm Corina fhe: 
a. Inner side 
Anterior blade 
ORAL VIEW ABORAL VIEW 
Fic. 37. Polygnathus sp. showing morphological terms used in the text. 
