184 
OSTEOSTHACI. 
of relatively large tubercles surrounded by groups of small tubercles ; 
margin of the shield with a close series of well-developed spinelets. 
The outline-restoration of the shield of this species, published by 
Lankester (fig. 23), appears to be too acute anteriorly, while the 
cornua seem to be too straight, long, and narrow. The marginal 
Fig. 23. 
Cephalaspis pagei, Lank.—Outline of shield, and a portion of its superficial 
ornament much magnified (A). After Lankester. 
asperities are shown in all the specimens mentioned below, thus 
confirming Lankester’s suspicion that Eucephalaspis asper might be 
only the adult of the present form. 
Form. Sf Loc. Lower Old Red Sandstone: Forfarshire. 
P. 122-124. Three typical specimens, showing portions of the head 
and trunk, the first two being in counterpart; Turin Hill, 
Forfar. Purchased, 1880. 
50115. Half of anterior shield, and imperfect lateral aspect of trunk ; 
in micaceous sandstone from Forfarshire. 
Purchased , 1879. 
P. 670. Head and trunk about 0*16 in length ; Turin Hill. The 
anterior portion of the shield exhibits traces of the charac¬ 
teristic ornament, and the dentate margin is distinct. The 
fine rhomboidal squamation of the heterocercal tail is well 
preserved ; and the dorsal and caudal fins occur as granu¬ 
lated membranous expansions. Egerton Coll. 
P. 125. Imperfect head and trunk of a large individual, in counter¬ 
part ; Turin Hill. This specimen precisely resembles the 
typical C. asper , . Purchased, 1880. 
