BRITISH AVONIAN CONODONT FAUNAS 177 
Ozarkodina cf. delicatula (Stauffer & Plummer) 
Plate 27, fig. 14 
1932 Bryantodus delicatula Stauffer & Plummer 29, Pl. 2, fig. 27. 
MATERIAL. 12 specimens : figured, X 292. 
Rance. North Crop ZLA 31-ZLA 33. 
DEscrRIPTION. The unit is bowed and slightly curved. Both bars are long. The 
anterior bar bears about 8 denticles which are sub-equal, laterally compressed, fused 
at their bases with free chevron tips, and all are inclined posteriorly. The antero- 
aboral edge is bluntly spatulate. The apical denticle is largest, fairly short, about 
twice the size of those of the anterior bar, laterally compressed and inclined 
posteriorly. The posterior bar is of equal length to the anterior bar, but less deep, 
and shallows posteriorly. The denticles are similar and about 8 in number. The 
basal cavity is minute and restricted to the aboral region of the apical denticle with 
sometimes feebly flaring lips. 
Remarks. Stauffer & Plummer (1932 : 29), described O. delicatula from Penn- 
sylvanian strata, and it has been recognized in Upper Viséan and Namurian rocks 
(Bischoff 1957, Higgins 1961). The present specimens appear to be very similar to 
the type specimens, and it is possible that the species has an even longer range than 
previously thought. 
Ozarkodina cf. elegans (Stauffer) 
Plate 27 ie: 24 
1938 Ctenognathus elegans Stauffer : 425, Pl. 48, figs. 9, 12. 
1940 Ctenognathus elegans Stauffer ; Stauffer : 422, Pl. 59, figs. 3-5, 8. 
1955 Ozarkodina elegans (Stauffer) Sannemann : 133, Pl. 6, fig. 9. 
1956 Ozarkodina denckmanni Ziegler : Pl. 7, figs. 1, 2, Pl. 6, figs. 30, 31. 
1957 Ozarkodina elegans (Stauffer) Bischoff & Ziegler : 76, Pl. 20, figs. 29-33. 
1958 Ozarkodina denckmanni Ziegler ; Bischoff & Sannemann : 99, Pl. 14, figs. 22, 23. 
1960 Ozarkodina vegularis Branson & Mehl ; Zimmermann : PI. IX, fig. ro. 
1961 Ozarkodina delicatula (Stauffer & Plummer) Rexroad & Burton: 1156, Pl. 141, 
fig. 12. 
1963 Ozarkodina media Walliser ; Spasov & Veselinovic : 246, Pl. 1, fig. 14 only. 
MATERIAL. 2 specimens : figured, X 109. 
RANGE. Avon Gorge Z 19-Z 37. 
DescripPTIon. The anterior blade bears 11 denticles fused to near their tips. The 
denticles are straight and inclined to the posterior at an angle of 80°. The posterior 
blade is straight and only half the height of the anterior blade. It bears up to 12 
denticles, which are fused for the greater part of their length, but free at their tips. 
The denticles of the posterior blade are free for a greater part of their length than 
those of the anterior blade. The denticles of the posterior blade are straight and 
inclined to the posterior at an angle of 45°. The aboral edge in lateral view, is 
gently arched. The apical denticle is straight, slightly higher than the posterior 
