132 BRITISH AVONIAN CONODONT FAUNAS 
REMARKS. The present specimens show strong resemblances to those described 
by Clarke (1960) as Ligonodina complectens. Rexroad & Collinson (1963 : 13) 
transferred Clarke’s specimens to the genus Magnilaterella. The present specimens 
differ from those of Clarke chiefly in the presence of an anterior bar, and it is this 
distinctive feature which justifies their inclusion in the genus Kladognathus. 
Kladognathus macrodentatus (Higgins) 
Plate 23, figs. 3-6 
1961 Lambdagnathus macrodentata Higgins : 214, Pl. 12, figs. 1-3, text-fig. 3. 
1963 Lambdagnathus macrodentata Higgins ; Bouckaert & Higgins : 17, fig. 3. 
Kladognathus macrodentata (Higgins) Collinson & Druce (in press). 
MATERIAL. I5 specimens : figured, X 197, X 198, X 199, X 200. 
RANGE. North Crop 3D 10-3D 22. 
DESCRIPTION. This species is characterized by a long arched posterior bar which 
bears characteristically hindeodellid denticulation on its oral surface. The larger 
denticles are separated by 1 or 2 smaller denticles, which are basally confluent but 
apically discrete. In well preserved specimens the major denticles of the series are 
very long, the largest, in the middle of the posterior blade, commonly being about 
three times the depth of the posterior bar. 
The short laterally compressed anterior bar is downflexed, but lies in the same 
plane as the posterior bar. Its anterior aboral margin is bluntly spatulate. There 
tend to be 2 or 3 small denticles in front of the apical denticle. The lateral bar is 
short, deeply arched, laterally compressed, and strongly deflected posteriorly, making 
an angle of 25°-45° with the arcuate posterior bar when seen in oral view. The 
lateral bar carries I or 2 stout, discrete denticles on its oral surface. The aboral 
margin of the entire unit is excavated by a shallow groove. | 
Kladognathus mehli (Rexroad) 
Plate 31, fig. 15 
1957 Cladognathus mehli Rexroad : 29, Pl. 1, figs. 11, 12. 
1958 Kladognathus mehli (Rexroad) Rexroad : 19, Pl. 3, fig. 5. 
1965 Kladognathus mehli (Rexroad) Rexroad & Nicoll : 20, 21, Pl. 1, fig. 7. 
MATERIAL. 3 specimens : figured, X524. 
Rance. North Crop 3D 14/15. 
DEscrRIPTION. This species is characterized by a very large, laterally compressed 
recurved fang, strong discrete denticles on the anterior and posterior bars, relatively 
strong curvature on the anterior and posterior bars, and a conspicuous attachment 
scar on the inner lateral face at the anterior end of the posterior bars. Our specimens 
agree closely with those illustrated by Rexroad. 
