﻿COCCOSTEID.E. 



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 Phlgctcenasjpis anglica, but its determination still remains 

 uncertain. 



Form. 4' 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 noticed 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 (<?.), 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. 



42148. Fragmentary impression of larger specimen ; Hereford- 

 shire. Baugh Coll, 



