[lambe] PANOPLOSAURUS MIRUS 43 



other and generally keeled. In their largest form they are plate-like 

 and unite in pairs, but with a decrease in size they grade into small 

 amorphus ossicles. Between these extremes there are many variations 

 in shape, and every gradation in size, dependent on location. 



In the type specimen many of the scutes are in their proper 

 relative position to each other over very considerable areas. Some of 

 these groups have been more or less displaced, others are preserved 

 practically in situ and give their true location. The displacement of 

 groups of scutes points to a post-mortem dislocation of the skin. In 

 places there is a decided folding of the skin. 



Some of the scutes belonging to the type individual were found 

 separate in the matrix, and many had weathered out and were loose 

 on the surface. Of these, some, through agreement in size and shape 

 with those in situ, can be fairly well placed, but the position of others 

 can be only surmised. 



The principal types of scutes distinctive of definite areas are as 

 follows : 



1. Large plate-like scutes with a low keel, coossified in trans- 

 verse pairs, forming a longitudinal dorsal, neck series from the head 

 backward. 



2. Scutes of various dimensions, but not attaining to the size of 

 the above, strongly keeled, from broadly to narrowly suboval in 

 outline, more or less pointed behind, and fiat or somewhat excavated 

 below, occurring laterally on the neck, and continuing backward on 

 to the trunk. 



3. Moderately small, keeled scutes with a thick, tumid base, 

 occurring on the throat and passing forward in the midline towards 

 the chin. 



4. Small, somewhat rectangular scutes, arranged in close-set 

 longitudinal rows with the greater diameter fore and aft, occupying 

 a latero-ventral position on the trunk. 



5. Smaller scutes with a polygonal outline, occurring along the 

 ventral midline arid grading outward into the latero-ventral rectangu- 

 lar ones of the trunk. These scutes are arranged after the pattern of, 

 and resemble, the small polygonal scutes, between the limpet-shaped 

 ones, of Stephanosaurns. 



6. Rather small, thin, keelless scutes, apparently from the limbs. 

 These scutes are suboval, or subtriangular, often irregular in outline, 

 with a transversely concave lower surface. With these are classed 

 also, as presumably from the limbs, thin scutes, generally quite small 

 in size, and of an irregular, broadly suboval or subcircular outline, 

 with a flat lower surface. 



