504 
actixopteeygii. 
15511. Obscure remains of head, opercular apparatus, pectoral arch 
and fin, and some anterior scales; Eislehen, Province of 
Saxony. The principal rays of the pectoral fin appear to 
have been unarticulated. Presented by T. S. Law , Esq. 
43434. Left maxilla and mandibular ramus, associated with other 
bones, much obscured by matrix ; Eiechelsdorf, Hesse. 
Presented by Kenneth Murchison , Esq., 1872. 
1992. Imperfect trunk wanting the head, pectoral and dorsal fins, 
and showing only fragments of the other fins ; Mansfeld. 
Purchased , 1837. 
P. 2064. Greater portion of trunk, imperfectly preserved, wanting 
the extremity of the tail, and the anal fin obscured by 
matrix ; Eisleben. Egerton Coll. 
P.836. Portion of squamation with anal fin, in counterpart; 
Eisleben. Egerton Coll. 
15411. Six portions of the trunk, chiefly caudal region, one ex¬ 
hibiting a good impression of the scales at the base of the 
caudal lobe, indicating the upward extension of the body- 
scales ; Eisleben. Purchased , 1840. 
43432. Imperfect caudal fin ; Eiechelsdorf. 
Presented by Kenneth Murchison , Esq., 1872. 
P. 3405. Much crushed remains of the head, scattered scales, a 
portion of the vertebral axis, and an impression of one of 
the fins, probably of this species; Eiechelsdorf. The 
tuberculations upon the head-bones are more completely 
fused into rugae than in typical examples of the species ; 
but numerous impressions of scales appear to exhibit the 
characteristic proportions and ornament. In the frag¬ 
ment of the axial skeleton of the trunk, the space occupied 
by the notochord is vacant; but there are short, stout 
neural arches with expanded bases, and a triangular 
haemal element is opposed to each. Enniskillen Coll. 
A species allied to A. sedgwiclci, from the Magnesian Limestone 
of Marsden and Eulwell Hill, Durham, not yet satisfactorily defined, 
is named A. Tcirkbyi , E. Howse, Nat. Hist. Trans. Northumb. and 
Durham, vol. vii. (1878), p. 171 (previously described by I. W. 
Eirkby as A. sedgivicki in Ann. Mag. Nat. Hist. [3] vol. ix. 1862, 
p. 269, and as Acrolepis , sp., in Quart. Journ. Geol. kSoc. vol. xx. 
