200 
OSTEOSTEACI. 
P. 5043. A typical specimen showing an impression of the inner 
aspect of the dorsal shield, with a loose portion of matrix 
lying between the hinder plate of this shield and an 
equally large, opposed ventral plate, of which the sub¬ 
stance is preserved; Bush Pitch, near Ledbury. The 
portion of matrix representing the space occupied by the 
soft parts of the animal is very thin, as shown in the 
transverse section, PL IX. fig. 7 a. The ventral plate 
(Pl. IX. fig. 7), as seen from the visceral aspect, is flat¬ 
tened, marked with the numerous openings of apparently 
vascular canals, and is not seen to extend beneath the 
anterior shield. 
Presented by John Edward Lee, Esq., 1885. 
P. 5313. Dorsal aspect of shield, showing portions of the external 
tuberculated layer; Bush Pitch. The specimen is shown, 
of the natural size, in PL XX„ fig. 8, and a portion of the 
ornament enlarged four times in fig. 8 a. The posterior 
plate is gently rounded from side to side, with only faint 
indications of a longitudinal median keel^ in the hinder 
half; and the superficial ornamentation consists of nume¬ 
rous rounded tubercles, closely, but irregularly arranged. 
Presented by George II. Piper, Esq., 1887. 
A fossil of very doubtful relationships, sometimes assigned to the 
family of Cephalaspidse, is described as follows :— 
Menaspis armata, T. Ewald, Bericht k. preuss. Akad'. Wiss. 1848, 
p. 33; H. B. Geinitz, Dyas (1861), p. 21.—Upper Per¬ 
mian (Zechstein) ; Lonau, Harz Mts. [Collection of 
Dr. Ewald, Berlin.] 
Another supposed ally of the Cephalaspidm is described thus :— 
Cephalopterus 'pagei, J. Powrie, Trans. Edinb. Geol. Soc. vol. i. 
(1870), p. 298, pl. xiv. fig. 16.—Lower Old Bed Sand¬ 
stone; Turin Ilill, Eorfar. [Collection of James Powrie, 
Esq., Beswallie, and Dundee Museum.] 
■? /2?<r - a. b 
