﻿OSTEOLEPID.E. 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 PL 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 Rhomboptychius. The removal of some of 

 the scales upon the tail exposes a few of the vertebrae (v.), 

 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 (cl x , d 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. Ennishillen Coll. 



P. 2292. Coprolite, with scales doubtfully of this species ; Govan, 

 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] N. Staffs. Nat. Field 

 Club, p. 229. 



1876. Megalichthys coccolepis, W. J. Barkas, Monthly Rev. Dental 

 Surgery, vol. iv. p. 60. 



1890. Megalichthys coccolepis, J. Ward, Trans. N. Staffs. Inst. Mining 

 Engin. vol. x. p. 165. 



