864 DR RAMSAY H. TllAQUAIR ON FOSSIL FISHES. 



Fig. 6. A specimen from Seggholm, in which the form of the head as well as of the caudal fin is shown 

 by a carbonaceous film. The lower lobe of the caudal is slightly distorted ; the body is bent nearly double. 

 Magnified two diameters. 



Fig. 7. Gridiron-like arrangement of parallel rods of both sides, vertically compressed and spread out, 

 and showing how those of opposite sides meet together in the dorsal middle line. The left set of rods is 

 crossed by the anterior part of the series of ventral scutes (v). From Birkenhead Burn, and magnified two 

 diameters. 



Fig. 8. Left series of parallel rods in a specimen from Seggholm ; enlarged by one half. The peculiar 

 chain of ossicles or rodlets is well seen in front of the anterior rod. 



Fig. 9. The three uppermost rodlets in a specimen from Seggholm ; magnified two diameters. 



Fig. 10. Outline of a usual form of the ventral scutes, seen from the side. Birkenhead Burn ; magnified 

 four diameters. 



Fig. 1 1 . Another form, in which the elevation is less. Seggholm ; magnified four diameters. 



Lasanius armatus, Traq. 



Fig. 12. The more perfect of the two specimens known, showing in a carbonaceous film the blunt form 

 of the head, and posteriorly the heterocercal caudal fin with its rays distinctly preserved. Seggholm ; 

 magnified three diameters. 



Fig. 13. Outlines of two of the ventral scutes of the other specimen, magnified four diameters. 



18MM00 



