BRITISH AVONIAN CONODONT FAUNAS 121 
1944 Ligonodina angulata Branson & Mehl; E. B. Branson: PI. 39, fig. 43. 
1947 Hindeodella millerella ? Youngquist & Peterson : 245, Pl. 38, figs. 1-5. 
1949 Hindeodella cf. Hindeodella corpulenta Branson & Mehl ; Thomas: 408, Pl. 1, fig. 4. 
1957 Hindeodella ? sp. Lys, Serre & Deroo : 800, Pl. 9, fig. 1. 
MATERIAL. 168 specimens : figured, X 160, X 161. 
Rance. North Crop KL 1-ZLA 33, Avon Gorge K 2-Z 37. 
DeEscriPpTIon. The main denticle is massive with a sub-circular cross-section at 
the oral extremity. It is ovate at its base, feebly recurved and posteriorly inclined. 
It is about one and a half times as wide as the next largest denticle. The anterior 
lateral process is deflected laterally through 90°, and depressed downward through 
go°. It commonly bears 6 isolated, sub-circular denticles, which increase in size in 
the mid part. The posterior bar is massive, laterally compressed and bears about 5 
massive, discrete, feebly laterally compressed, posteriorly inclined denticles, the 
largest being in the posterior third. No smaller “ hindeodellid’”’ denticles are 
present. The posterior bar is deflected downward slightly towards the posterior end. 
In aboral view the large cavity is situated just anterior to the main denticle, and 
extends beneath the anterior lateral process. It is grooved along its mid-length. 
The inner lateral face may bear a feeble longitudinal ridge. 
REMARKS. Most specimens of this species have the posterior bar broken, but the 
distinctive anterior lateral process and the basal cavity serve to identify it. 
Hindeodella croka Collinson & Druce 
Plate 28, figs. 15-17 
1957 Hindeodella brevis Branson & Mehl ; Bischoff: 26, Pl. 6, fig. 24. 
1961 Hindeodella brevis Branson & Mehl ; Higgins: Pl. ro, fig. 14. 
Hindeodella croka Collinson & Druce in press. 
MATERIAL. 7 specimens : figured, X 164, X 162, X 163. 
Rance. North Crop 3D 9-3D 14/15. 
DeEscripTIon. The distinctive elongate form and enormously flexed anterior 
lateral process of the species are very distinctive features, and agree in all respects 
with the description of Collinson & Druce. There is a tendency in some specimens 
for the posterior bar to develop broadly hindeodellid denticulation, but this is not 
very clearly defined. In some specimens the anterior lateral process bears up to 8 
denticles. 
Remarks. A single specimen (Pl. 28, fig. 29) is compared with this species, 
differing from it in the very strong lateral extension of the inner lateral face of the 
unit. It is extended laterally along the whole length of the unit posterior to the 
origin of the anterior lateral process, forming a platform-type flange, with a rather 
flat, oral surface and a convex to vertical outer lateral face. The relatively incon- 
spicuous main denticle is strongly inflexed, downflexed and less strongly recurved. 
