coccosteidj£ 
297 
and a bilaterally symmetrical ridge-scute, having a similar ornament, 
was regarded as occupying an anterior position on the dorsal aspect 
of the trunk of the same fish. The latter fossil may be the dorsal 
plate of Phlyctcenaspis anglica, but its determination still remains 
uncertain. 
Form, Sf Loc. Lower Old Red Sandstone (Cornstones) : Hereford¬ 
shire^ » 
42147- Cranial shield, imperfect postero-laterally, chiefly shown as 
an impression of ’ the outer aspect upon the matrix; 
Cradley. The specimen is by Traquair, loc. cit. 
p. 59, pi. iii. fig. 4, and is also shown, of the natural size, 
in PI. VIII. fig. 5. The excavation for the median rostral 
plate is distinct anteriorly, and there are faint traces of 
the sutures between the preorbital (p.o.), central (c.), and 
median occipital ( [m.o .) plates. The outlines of some of 
the lateral plates may also possibly be distinguishable; 
and the principal lateral grooves for the sensory canals 
are very prominent. The coarse, irrregular nature of the 
ornamentation is well displayed, and most of the tubercles 
are broken in the depressions they leave in the matrix. 
Baugh Coll. 
37388. Greater portion of cranial shield, exhibited partly from the 
inner aspect, partly in impression of the external tuber- 
culated surface, and shown, of the natural size, in PI. VIII. 
fig. 6 ; Heightington, Worcestershire. The small, trans¬ 
versely elongated rostral plate (r) is retained in position 
and exhibits a somewhat finer and closer granulation than 
the other elements ; it is almost oval in form, with pointed 
lateral extremities. The closed sutures between the pre¬ 
orbital ( p.o .), central (c.), and median occipital (m.o.) bones 
are also distinct; and the lateral grooves of the sensory 
canal-system exhibit their usual prominence. 
Purchased , 1863. 
37388 a. Fragmentary cranial shield, with some of the faintly 
stellate tubercles disengaged from matrix; Heightington. 
Purchased , 1863. 
38032. Imperfect cranial shield, wanting rostral plate, shown 
chiefly as an impression of the external aspect; Height¬ 
ington. Purchased , 1864. 
42146. Fragmentary impression of larger specimen ; Hereford¬ 
shire, Baugh Coll . 
