0SXE0LEPIDU2. 
383 
Airdrie. The head and abdominal region are very im¬ 
perfectly preserved, but the caudal region is well exhibited 
from the lateral aspect, and is shown, of the natural size, 
in PI. XIII. fig. 4. Impressions of the opercular appa¬ 
ratus occur, and there are fragments of the pectoral fins ; 
but the only other feature of interest in the anterior por¬ 
tion of the fish is the “ decortication ” of the scales, which 
consequently exhibit the characteristic ornamentation of 
the so-called Rhombopty chius. The removal of some of 
the scales upon the tail exposes a few of the vertebrae (F.), 
with their neural and haemal arches ; and impressions 
of several of the latter are distinct at the base of the 
caudal fin (c). In the front of each median fin there are 
large fulcral scales at the base, and a few of the anterior 
fin-rays are coated with ganoine : all the rays are broad, 
articulated, and closely arranged. The lobe of one of the 
pelvic fins (plv.) is distinct, and the dorsal fins (d v cl 2 ) 
are opposed to this and the anal (a) respectively; the 
posterior portion of the caudal fin (c) is unfortunately 
missing. Purchased , 1864. 
P. 3325. Imperfect fish, wanting fins, about 0*7 in length, doubt¬ 
fully pertaining to this species : Castlecomer, Kilkenny, 
Ireland. Portions of some head and opercular bones 
and impressions of others are seen ; and the left clavicle 
and infraclavicle occur, destitute of the superficial layer 
of ganoine. Enniskillen Coll. 
P. 3325 a. Partly scattered squamation of a similar fish; Castle¬ 
comer. Enniskillen Coll. 
P. 2292. Coprolite, with scales doubtfully of this species; Go van, 
near Glasgow. Presented by George Griffiths, Esq., 1852. 
Megalichthys coccolepis, Young. 
[Plate XIII. fig. 5.] 
1870. Megalichthys coccolepis, J. Young, Rep. Brit. Assoc. 1869, Trans. 
Sect. p. 102. 
1875. Megalichthys coccolepis, J. Ward, [Proc.] X. Staffs. Xat. Field 
Club, p. 229. 
1876. Megalichthys coccolepis, W. J. Barkas, Monthly Rev. Dental 
Surgery, vol. iv. p. 60. 
1890. Megalichthys coccolepis , J. Ward, Trans. X. Staffs. Inst. Minin g 
Engin. vol. x. p. 165. 
