332 
C.J. Burrow 
Figure 1 Location of sites C607, C661, C662 and C665 
of the Trundle beds; map adapted from 
Australian Topographical Map Series 
1:250000 Narromine. Site C607(=A): 6 km E 
of The Troffs railway station, GR 573500 
941800; site C661(=B): tank S of "The Troffs" 
station, GR 573ooo 942ooo; site C662(=C): 
Dam at foot of hills of volcanics, "The Troffs" 
station, GR 575ooo 943ooo; site C665(=D): 3 
km SE of The Troffs railway station, GR 
572ooo 938ooo. 
sites C607, C661, C662 and C665 in the Trundle 
beds of central New South Wales of Early 
Devonian age (Lochkovian; pesavis zone) (Table 1). 
Site and specimen numbers were provided by Dr 
Pickett; MMMC = Fossil collection of the 
Mineralogical and Mining Museum, Sydney. 
5 mm 
Figure 2 Gnathal bones of other Australian 
ischnacanthids, after Long 1986, figs 3A,C 
and B. A, Taemasacanthus lower jaw, medial 
view; B, same jaw, lateral view; C, 
Rockycampacanlhus lower jaw, occlusal view, 
am = attachment area for adductor 
mandibulae, cr = circular ridge, mo = 
Meckelian ossification, pp = posterodorsal 
process of lower jaw. Scale bar = 5 mm; 
arrows indicate rostral direction. 
DESCRIPTIONS 
Class Acanthodii 
Order Ischnacanthida Berg, 1940 
Ischnacanthid fam., gen. et sp. indet. 
Represented by 12 dentigerous jaw fragments, 21 
tooth whorls, 14 isolated teeth, and 15 dentition 
cones (Table 1). In the following account the most 
Table 1 Number of dental elements present in each 
Trundle beds sample. 
C607 
C661 
C662 
C665 
Anterior jaw 
3 
4 
- 
_ 
fragment 
Mid jaw fragment 
- 
3 
- 
- 
Posterior jaw 
- 
2 
- 
- 
fragment 
Symmetrical tooth 
5 
8 
- 
- 
whorl 
Single tooth 
7 
5 
2 
- 
Dentition cone I 
5 
2 
- 
- 
Dentition cone II 
5 
2 
- 
1 
Asymmetrical tooth 
1 
- 
- 
- 
whorl 
Denticulated plate 
1 
3 
2 
1 
plus tooth whorl 
