21S 
ANTI1RCHA. 
28859, 39175. Much crushed individual, in counterpart, exhibiting 
the lateral and partly dorsal aspect. The elements of the 
head are almost unrecognizable, and those of the trunk 
and appendages are imperfectly displayed. The dorsal 
fin upon the tail is distinct, with remains of its fulcral 
scale; and more posteriorly is observed the series of large 
dorsal ridge-scales. 
Purchased , 1854, and Bowerbank Coll. 
49188. Head, trunk, appendages, and fragment of tail, ventral 
aspect, preserved in counterpart. In the head, the “ os 
dubium ” or pineal plate, with its central pit, is well shown. 
Purchased , 1878. 
50108. Large specimen wanting the tail and the extremities of the 
appendages. The trunk measures (>078 in length, ex¬ 
hibiting the ventral aspect, and the roof-plates of the head 
are seen from beneath. Most of the latter are well shown, 
and as their substance is partly destroyed, the course of 
the sensory canal upon the laterals and premedian can 
be traced. The extra-laterals are detached. 
Purchased, 1879. 
50111. Well-preserved specimen, ventral aspect, in counterpart, the 
impression shown of the natural size in PI. VI. fig. 2, and 
explained by the lettering. The tail is somewhat twisted, 
thus exhibiting the dorsal fin. Purchased , 1879. 
50113. Small specimen, wanting the tail, ventral aspect. 
Purchased , 1879. 
P. 3211. Much crushed specimen, ventral aspect, wanting appen¬ 
dages. EnnisTcillen Coll. 
P. 4037. Small head and trunk, ventral aspect, in counterpart. 
Purchased , 1883. 
, (ii.) Tynet Burn. 
t 
44588. Small imperfect crushed specimen, ventral aspect. 
Purchased , 1873. 
(iii.) Edderton, near Tain. 
P. 1172. Much crushed and broken individual. Egerton Coll. 
(iv.) Orkne} T (typical P. cancriformis ). 
P. 532. One of the type specimens of P. cancriformis figured by 
