172 
HETEROSTRACI. 
P.3240. Two typical specimens preserved in ferruginous matter; 
Ivington. Enniskillen Coll. 
P. 3241. Well-preserved fragments of an apparently uncrushed 
shield, the ornamentation of part of the disc being shown, 
of twice the natural size, in Pl. IX. fig. 3; Upper Silu¬ 
rian Bone-bed, Martel, near Ledbury. Enniskillen Coll. 
The so-called Beaphaspis truncatus 1 or Pteraspis trunccitus 2 ap¬ 
pears to the present writer to be founded in part upon the detached 
median discs of Cyathaspis banksi, and in part upon ventral shields 
that may probably be referred to this species. The following are 
specimens of this character :— 
P. 683 a. Shield preserved in ferruginous matter, and the anterior 
half of a similar specimen ; Downton Sandstone, Kington. 
Egerton Coll. 
P. 3243. A complete, apparently uncrushed specimen, similarly pre¬ 
served; Kington. Enniskillen Coll. 
42158. Impression of shield showing ornament; locality unknown. 
Baugh Coll. 
P. 3244. Well-preserved fragment of shield, perhaps of this species ; 
Ludlow Bone-bed, Ludford Lane, Ludlow. 
Enniskillen Coll. 
Cyathaspis maccnallonghi, sp. nov. 
[Plate IX. fig. 4.] 
Type. Imperfect dorsal shield: British Museum. 
Median disc oblong, relatively narrow; rostrum very short and 
broad ; lateral cornua extending from the orbits backwards, broadest 
mesially. Superficial striae relatively coarse, those of the disc uniform 
and not interrupted with longitudinal costae. 
Form, Loc. Lower Old Bed Sandstone : Herefordshire. 
P. 4797. The type specimen, shown, of the natural size, in PI. IX. 
fig. 4; England’s Hill Quarry, Bodenham. A large por¬ 
tion of the shield is preserved, being exposed from the 
1 E. R. Lankester, Fishes Old Red Sandst. pt. i. (Pal. Soc. 1868), p. 24 
pl. ii. figs. 1-3. 
2 Huxley & Salter, Quart. Journ. Geol. Soc. vol. xii. (1856), p. 100, pl. ii. 
fig. 1. 
