48 



EXPLANATION OF THE FIGURES. 



Fig. 1. Restoration of the arranajement of the plates. 



A. Side view of cranium of DinichthA's, from left side. a, a 

 socket in exoccipital into which the head of the supra-scapula fits, to 

 attach it to the head. 



B. Supra-scapula of Newberry-. Anterior dorsolateral of East- 

 man, b. the head of the supra-scapula which drops into the 

 socket a on A. 



C. Side view of the dorsal shield. 



D. Post-clavicular of Newberry. It fits on the lower side of 

 the dorsal plate and runs downward. It is overlapped by several 

 other plates. On its upper anterior side is a sulcus or depression, 

 into which the upper posterior margin of the supra-scapula fits. Be- 

 low this, on the same bone, is another sulcus on which rests a small 

 oval bone which passes under the supra-scapula. 



E. .\n imdescriljcd lateral plate seven inches long, whose upper 

 end overlaps the lower end of D. It is a long, concavo-convex bone, 

 and has on its lower end a depression, the lower portion turning up 

 as a lip. 



F. Fin bone, ("clavicle" of Newberry) one prong of the divided 

 end of which drops into the depression on the lower end of E. 



G. An anterior lateral plate, which overlaps the lower border of 

 the supra-scapula B, as well as the anterior part of D, and covers the 

 lower prong of the bone F. The upper piong of F over-rides for a 

 short distance, the lower and back portion of G, and binds the whole 

 mass together. 



Fig. 2. Photograph of the bones B, C, D and E of Fig 1 in their 

 actual position, but with the concealed margins indicated by dotted 

 lines. 



Fig. 3. Fin bones ( F) entire, ("clavicle" of Newberry ) on one 

 end of these is anchylosed a hooked bone that fits around the raised 

 end of E. and is thus held in position. On one of these can be seen 

 some ot the rays of the fin, still adhering. 



