ASTEROLEPIDJE. 
221 
48163. Trunk and portions of head and tail, ventral aspect, in 
counterpart. The displaced “ os dubium ” is shown, and 
one of the orbital plates is exhibited in the dorsal opening 
of the head. Purchased , 1877, 
49189. Small individual with imperfect head and tail, ventral 
aspect, in counterpart. The left extra-lateral plate is seen 
displaced ; the expansion of the pectoral appendages is 
distinct; and two or three of the dorsal ridge-scales upon 
the tail are exhibited. Purchased , 1878. 
50107. Imperfect head and trunk, ventral aspect, in counterpart, 
shown, of the natural size, in PI. VI. fig. 4. In the 
orbital opening, the “ os dubium ” (p.) and the two 
orbital plates are - exhibited. The left pectoral append¬ 
age displays the characteristic distal expansion. 
Purchased. 1879. 
50108. Crushed individual, wanting extremities of appendages, 
. ventral aspect. The tubercular ornamentation of the 
ventral plates is well shown in impression. 
tfo Purchased, 1879. 
50112. Imperfect crushed trunk with right pectoral appendage, 
remains of the head, the greater portion of the tail and 
dorsal fin. Purchased, 1879. 
P. 657. Two imperfect specimens, ventral aspect, one displaying 
the left pectoral appendage. Egerton Coll. 
P. 6071. Ventral plates of trunk, fragments of left pectoral appen¬ 
dage and tail. Presented by F. Harford, Esq., 1889. 
P. 4038. Trunk 0*035 in length, with portions of appendages and 
tail, ventral aspect, in counterpart, probably young of this 
species. Purchased, 1883. 
(iii.) Tynet Burn. 
37781. Much crushed trunk, ventro-lateral aspect, showing left 
pectoral appendage and fragments of head and tail. The 
tubercular ornamentation is well displayed. 
Purchased, 1863. 
35979. Large specimen, ventral aspect, doubtfully of this species. 
The displaced mental plates are seen from their concave 
visceral aspect; the internal transverse ridge upon the 
anterior ventro-laterals is distinct; and the tubercular 
