﻿128(5 ARTHRODIRA. 



(ii.) Caithness. 



49663. Imperfect remains of a very large individual, displaying the 

 same aspect as the two last-mentioned specimens ; Hol- 

 burn Head. Purchased, 1879. 



20346. Median dorsal plate and imperfectly preserved caudal region. 



Purchased, 184(5. 



(iii.) Edderton, near Tain, Ross-shire. 



38727. Imperfect head, dorsal aspect, and several portions of plates 



of the trunk. Purchased, 1865. 



39896. Inferior aspect of imperfect cranial roof. Purchased, 1866. 



P. 695, P. 1171. Roof of skull, imperfect laterally ; also the im- 

 pression of a similar specimen associated with a mandibular 

 ramus and portions of the plates of the trunk. 



Ecjerton Coll. 



P. 5600. Less imperfect example, with displaced maxillaries and 

 premaxillaries, one of the latter apparently exhibiting the 

 notch interpreted as nasal by Traquair. The specimen 

 also exhibits one of the anterior dorso-lateral plates. 



Harford Coll. 



38728. Crushed median dorsal plate, associated with portions of 



other plates, fragments of the axial skeleton, and a small 

 undetermined, almost reniform element, apparently un- 

 ornamented. Purchased, 1865. 



41729. Imperfect median dorsal plate, probably uncrushed, asso- 

 ciated with portions of other plates. In the median 

 dorsal the rounded longitudinal keel only extends along 

 the posterior two-thirds of the bone, the surface sloping 

 downwards both in front and on each side of its com- 

 mencement. Purchased, 1869. 



?. 695 a, P. 1171 a. Portions of the dorsal and ventral plates of the 

 trunk, with the supporting bones of the dorsal fin and 

 part of the axial skeleton, in counterpart. Remains of 

 the pelvic elements are distinguishable, and in the ab- 

 dominal region the small unornamented plate, figured 

 below in Xo. 43617, is exhibited. Egertort Coll. 



P. 1171 b, P. 3220 a. Ventral plates of trunk, with remains of 

 dorsal and lateral plates, in counterpart. 



Egfrton 4' Eunkkillen Colls. 



