170 BRITISH AVONIAN CONODONT FAUNAS 
tends to be rather more elongate and is slightly twisted. This distinction does not 
seem sufficient, however, to warrant their recognition as a different species, and in 
other aspects of their denticulation and general form they closely resemble Ozarkodina 
compressa. 
Ozarkodina delicatula (Stauffer & Plummer) 
Plate 27, figs. 15, 19 
1932 Bryantodus delicatulus Stauffer & Plummer : 29, PI. 2, fig. 27. 
1932 Bryantodus nasutus Stauffer & Plummer : 29, Pl. 2, fig. 28. 
1932 Byryantodus sulcatus Stauffer & Plummer : 30, Pl. 2, figs. 11, 14, 30. 
1933 Byryantodus delicatus Gunnell : 267, Pl. 32, fig. 43. 
1933 Bryantodus rugosus Gunnell : 269, Pl. 32, fig. 44. 
1933 Bryantodus stritatus Gunnell : 268, Pl. 32, fig. 45. 
1933 Bryantodus strigillatus Gunnell : 268, Pl. 32, fig. 46. 
non 1933 Bryantodus delicatus (Stauffer & Plummer) Branson & Mehl: 222, Pl. 16, fig. 19. 
1941 Ozarkodina delicatula (Stauffer & Plummer) Ellison : 120, Pl. 20, figs. 40-42, 47. 
194% Ozarkodina delicatula (Stauffer & Plummer) Ellison & Graves : 3, Pl. 1, figs. 
12-14. 
1944 Ozarkodina delicatula (Stauffer & Plummer) E. B. Branson : 327. 
1948 Ozarkodina delicatula (Stauffer & Plummer) Youngquist & Heezen: 771, Pl. 118, 
fig. 6. 
1949 Ozarkodina delicatula (Stauffer & Plummer) Youngquist & Downs : 168, Pl. 30, 
HES) Teese7 
non 1949 Bryantodus delicatus (Stauffer & Plummer) Beckmann 161, Pl. 1, fig. 7 ; Pl. 3, 
fig. 3. 
1952 Ozarkodina delicatula (Stauffer & Plummer) Rhodes : 893, Pl. 126, figs. 2, 3. 
1957 Ozarkodina delicatula (Stauffer & Plummer) Bischoff : 39, Pl. 1, figs. 25-28. 
1958 Ozarkodina compressa Rexroad (partim) : 24. 
1961 Ozarkodina delicatula (Stauffer & Plummer) Higgins : 220, Pl. 12, fig. 13. 
1961 Ozarkodina delicatula (Stauffer & Plummer) Rexroad & Burton :. 1156, Pl. 141, 
fig. 12. 
1963 Ozarkodina delicatula (Stauffer & Plummer) Bouckaert & Higgins: 17, fig. 3. 
Ozarkodina delicutula (Stauffer & Plummer) Collinson & Druce (in press). 
MATERIAL. 27 specimens : figured, X 290, X 2g1. 
RanGE. North Crop CYD 7-3D 20. 
DeEscriPTION. This is a relatively variable species with the following character- 
istics. Anterior and posterior bars are thin, blade-like, straight or continuously 
gently arched, the anterior tending to be the deeper and the longer. Denticles 
closely spaced, more or less sub-equal, discrete only at their pointed apical ends. 
Apical denticle is from one and a half to three times the width of the adjacent 
denticles. It has a slightly flared basal cavity. 
The anterior bar is of more or less uniform depth and has a straight to gently 
concave aboral edge. It bears 12 to 14, strongly laterally compressed denticles, 
which are confluent for most of their length only their apical tips being discrete. 
These are sharply pointed, with sharp anterior and posterior edges which are straight. 
The anterior bar itself is about equal in depth to the length of the denticles. The 
