BRITISH AVONIAN CONODONT FAUNAS 91 
Euprioniodina microdenta (Ellison) 
Plate 22, figs. 16a, b 
1933 Synprioniodina sp. Gunnell : 260, Pl. 31, fig. 6. 
1941 Synprioniodina microdenta Ellison : 108-111, 119, Pl. 20, figs. 43-46. 
1941 Synprioniodina microdenta Ellison ; Ellison & Graves : 3-4, Pl. 1, fig. Io. 
1944 Synprioniodina microdenta Ellison ; Branson : 327. 
1952 Synprioniodina microdenta Ellison ; Rhodes : 893, Pl. 126, fig. 4. 
MATERIAL. 2 Specimens : figured, X 84. 
RANGE. North Crop 3D 4-3D 14/15. 
DESCRIPTION. The present specimens are characterized by a very short anterior 
bar and a greatly elongated posterior bar. In outer lateral view the posterior bar is 
greatly elongated, tending to increase in depth posteriorly. Its outer lateral face is 
flat to gently convex, and it is about equal in depth to the length of the free denticles. 
Its oral surface bears about 14 long, slender denticles, more or less subcircular in 
cross-section, though showing a slight tendency to lateral flattening. They are 
discrete for most of their length and are sharply pointed. They are separated by 
very much finer needle-like denticles, which are only a quarter to a third the width of 
those of the major series. All denticles slope anteriorly, and are also more or less 
curved inwards. They tend to increase in size towards the posterior third of the bar. 
The outer lateral face of the main cusp is gently convex and it has conspicuously 
sharp anterior and posterior edges. The anterior bar is very short, being only about 
one-sixth the length of the posterior ; it tapers rapidly towards its distal end. It 
bears 3 or 4 minute denticles, which lie parallel to the main cusp. In inner view the 
whole unit is gently flexed, so that the inner lateral faces are very feebly concave. 
The aboral margin of the posterior bar is more or less straight in lateral view, apart 
from its rapid curvature below the apical denticle. The two bars diverge at an angle 
of about 60°. The apical denticle is about three times the width of the largest 
denticles of the posterior bar. 
Euprioniodina sp. nov. A 
Plate 22, figs. 13a, b 
MATERIAL. I specimen: Holotype X 86 (figured). 
LOCALITY AND HORIZON. Hosie Limestone, Fife Coalfield. Sample HOSIE 2B. 
RANGE. Scotland HOSIE 2B. 
DeEscripTIon. A Euprioniodina with a massive, laterally compressed, incurved and 
recurved apical denticle. The anterior bar is short and pointed with up to three 
confluent denticles. The posterior bar is short with three minute denticles developed 
on the posterior edge of the apical denticle. 
The present specimen is very fragmentary, but it shows a massive apical denticle 
which is laterally compressed with sharp anterior edges and gently convex lateral 
faces. It is recurved sharply posteriorly in its lower portion. The short anterior 
bar is pointed and bears a series of two or three confluent denticles on its oral edge 
