G. Ii. Wieland — Notes on the Armored Dinosauria. 115 



(»). A portion of post cranial band — of. figure ], s. s — as well 



as larger parts of same rugose surface character, with heavy 



sulci. All may be supra-cranial plates. 

 (o). A cranial element (jugal) — cf. figure le. 

 (p). Many fragments of limb bones and other parts of skeleton 



not determinable but bulking up as great as the jiarts 



determinable. 



The principal anatomical features readily determinable from 

 this type, as in part illustrated in my previous description (cf. 

 loc. cit. figures l-7a) and by the accompanying figures 1-Sa, 

 are: — 



1. That the length of the animal was about four meters, 

 being perhaps less than half the size of Stegosaurus, and dis- 

 tinctly smaller than Stegopelta / — whence the length of a spine 

 series measured from near the skull over the lumbar-hip cara- 

 pace, and including the anterior three-fourths of the tail, would 

 be three meters more or less. 



2. The dermal elements present in whole or part now num- 

 ber nearly 70. Hence if all were arbitrarily placed end to end 

 with an allowance of say one-fourth their actual size as abut- 

 ting space, a length of from 9 to 10 meters on keel lines or the 

 equivalent of three full keel lengths is present. Or counting 

 off space for the lumbar-hip carapace, fully four keels. 



3. Since the dermal elements no doubt fairly represent all 

 the keels and yet include no strictly bilateral members, it is 

 not likely that there was a true median keel, whence five to six 

 keels are arbitrarily demonstrated as present. 



To make an estimate of the maximum number of keels is 

 however seen to be impracticable. One can only say that 

 there appear to have been at least as many as on the turtles 

 with a neural, two pleural, two supra-marginal, and two mar- 

 ginal keels, or seven in all. 



4. Since a few cranial bones are present, but no portion of 

 the lumbar-hip carapace which was no doubt well developed, 

 it is likely that the dermal elements recovered are mainly of 

 the anterior dorsal region. 



5. The complex character of the armor is striking, combin- 

 ing as it does a system of free keels which lose their identity 

 in a lumbar-hip carapace and must then reappear in the caudal 

 rings. No less too is the tout ense?nble one of the most ornate 

 that has ever been demonstrated. For as we see the elements 

 of the keels vary regularly in shape from tubercles through 

 rounded, oblong, elliptical, subrhombic and crescentic forms, 

 with regularly increasing elevations passing from points to 

 ridges both straight and sigmoid, low bifid, and at last huge 

 caudal spines. 



