BRITISH AVONIAN CONODONT FAUNAS 167 
RANGE. North Crop 3D 17. 
DESCRIPTION. This species is marked by the lack of a large aboral process and 
the presence of a wide flaring basal cavity. The anterior denticle is strongly laterally 
compressed, fairly short and recurved in its aboral third. The posterior bar is deep 
and relatively short, bearing a series of 14 fused, laterally compressed, needle-like 
denticles, which are inclined posteriorly. In aboral view the pit is large and sub- 
apical, having flaring lips. It runs along the posterior bar as a narrowing cavity 
terminating at the posterior extremity of the posterior bar. 
Neoprioniodus cf. armatus (Hinde) 
Plate 21, figs. 3a—c 
1879 Prioniodus avmatus Hinde (partim) : 360, Pl. 15, fig. 20, non fig. 21. 
MATERIAL. 3 specimens : figured, X 283. 
RANGE. North Crop ZLA 14. 
Description. The anterior denticle is tall and laterally compressed. The 
anterior edge is feebly concave in lateral view, with a sharp anterior and posterior 
edge. The blunt aboral surface projects slightly aborally. The posterior bar is 
denticulate, curved inward, and slightly twisted. The fused denticles are small, 
more or less erect, number about 11, and decrease in height posteriorly. The cavity 
is small and situated postero-aborally of the anterior denticle. 
REMARKS. This form appears to be very close to Neoprioniodus armatus (Hinde 
1879, Pl. 15, fig. 20) which is most abundant in the Upper Devonian. This species 
probably has a long range, and the present specimens may well belong to it but 
because of their limited occurrence, both stratigraphically and numerically, we have 
not made a direct assignation. MHinde’s fig. 21 probably represents a different 
species. 
Neoprioniodus cf. camurus Rexroad 
Plate 22, figs. 1a—4b 
1957 Neoprionodus camurus Rexroad : 33, Pl. 2, figs. 18-20. 
MATERIAL. 10 specimens: figured, X 284, X 285, X 286, X 287. 
RANGE. North Crop 3D 14/15. 
Description. The distinctive features of this species are the relatively elongated 
posterior bar, the sharp inner lateral curvature of the bar immediately posterior to 
the anterior denticle, and the slender anterior denticle and aboral process. 
The posterior bar is more or less straight in inner lateral view, and is relatively 
shallow. Its oral surface bears up to 18 denticles, some of which are separated by 
smaller germ denticles. The denticles are confluent for most of their length, and 
only their apices are discrete. The apices are sharply pointed with sharp anterior 
and posterior edges and gently convex lateral faces ; those in the posterior quarter 
