66 BRITISH AVONIAN CONODONT FAUNAS 
The following prefixes are used to describe the various collecting areas : 
Avon Gorge :_ the section at the Avon Gorge, Bristol, and immediately adjacent 
areas (see p. 18 and Figs. 59-69). 
North Crop: the northern limb of the synclinal structure of the South Wales 
Coalfield in Brecknockshire and Monmouthshire (see p. 22 and 
Figs. 7, 70-73). 
Scotland :_ the various sections from the Midland Valley of Scotland (see p. 29 and 
Figs. 79-91). 
Farlow: the Avonian section at Farlow, Shropshire (see p. 25 and Figs. 74-75). 
In numbers of cases we have made use of open nomenclature in our specific and 
generic assignments. We have followed this method where either the preservation 
or numbers (or both) of specimens were so poor that we felt it unjustifiable to use a 
formal name, even though we have sometimes recognized particular forms as 
representing new species, and, in two cases, new genera. 
Ranges for species are given only for the Avon Gorge and North Crop, except 
where species are not present in these areas. Ranges for other areas are shown on 
the appropriate range charts. In all cases, the ranges represent the maximum 
distribution of the species, which may not always be present in every sample residue 
between its first and last appearance. In most such cases, its absence is attributable 
to particular samples proving barren or producing very low yields. 
Catalogue numbers refer to specimens deposited in the British Museum (Natural 
History). 
Genus ANGULODUS Huddle 1934 
1934 Angulodus Huddle : 76. 
Type sPEcIES. AHindeodella walrathi Hibbard 1927. 
Angulodus walrathi (Hibbard) 
Plate 209, fig. 8 
1927 Hindeodella walvathi Hibbard : 205, text fig. 4a, b. 
1934 Angulodus walvathi (Hibbard) Huddle: 77, Pl. 4, fig. 15 ; Pl. ro, fig. 5. 
1934 Angulodus demissus Huddle: 77, Pl. ro, fig. 15. 
1940 Angulodus elongatus Stauffer (partim) : 419, Pl. 58, figs. 1, 2 only. 
non 1957 Angulodus walvathi (Hibbard) Bischoff : 17, Pl. 5, figs. 44, 45. 
non 1961 Angulodus walvathi (Hibbard) Higgins : tro, fig. 16. 
MATERIAL. 21 specimens : figured, X 36. 
RANGE. North Crop KL 3-ZLA 6, Avon Gorge Z 4-Z 37. 
DescripTion. An arched elongated unit, with a straight anterior bar which is 
laterally compressed and deflected through 45° in a vertical plane. The anterior 
bar bears a series of at least 6 fine, laterally compressed, confluent, posteriorly inclined 
denticles, their apices being discrete. The apical denticle is about twice as high and 
three times as wide as the other denticles, and is of the same general form. The 
