PTERASPIDJE. 
171 
1858. Pteraspis banksii, T. II. Huxley, ibid. vol. xiv. p. 274, pi. xv. 
1865. Cyathaspis banksii, E. R. Lankester, Rep. Brit. Assoc. 1864, 
Trans. Sect. p. 58. 
1868. Cyathaspis banksii, E. R. Lankester, Fishes Old Red Sandst. 
pt. i. (Pal. Soc.) p. 26, pi. ii. figs. 9-11, pi. iv. fig 6, 
Type. Dorsal shield; unknown. 
The type species, the dorsal shield attaining a length of about 
0’05. Median disc oblong, strongly arched from side to side, trun¬ 
cated posteriorly, with a very small median spine; rostrum very 
short and broad; lateral cornua extending from the orbits back- 
Fig. 17. 
T 
8 
Outline of dorsal shield of Cyathaspis, restored by Lankester. 
c., cornua; d., median disc; o., orbit; r., rostral plate; s., dorsal spine. 
wards, broadest mesially, tapering behind, and not projecting beyond 
the posterior margin of the disc. Superficial striae fine, those of the 
rostrum transverse, the others longitudinal, and those of the disc 
partially subdivided into groups by irregular longitudinal costae. 
Form. Sp Loc. Upper Ludlow and Downton Sandstone: Here¬ 
fordshire. 
45939. Small slab of Downton Sandstone, with ca^s of four im¬ 
perfect shields, one figured by Lankester, op. cit. pi. iv. 
fig. 6 ; Bradnor Hill, Kington. IAglitbody Bequest. 
P. 684, P. 683. Ferruginous fossil shield, showing the coarse longi¬ 
tudinal costae of the disc with intervening fine striae ; also 
a cast of the inner aspect of part of a similar specimen 
displaying some of the supposed branchial excavations and 
the pineal pit; Downton Sandstone, Kington, 
Egerton Coll . 
