HATCHER: OSTEOLOGY OF HAPLOCANTHOSAURUS 41 
After a careful consideration of all the evidence ‘at hand the following is sub- 
mitted as the approximate vertebral formula in the present genus.  Cervicals 15 ; 
Dorsals 14; Sacrals 5; Caudals not less than 40. 
Below I give the principal dimensions of the several vertebree pertaining to the 
type of the present species. Some of these dimensions have been materially altered 
by crushing in such manner as to cause apparent inconsistencies. ‘They should only 
be taken as representing in a general way the dimensions of the various vertebre. 
In column | the greatest expanse of the transverse processes is given, column 
2, greatest length of centrum ; column 38, transverse diameter of centrum at posterior 
extremity ; column 4, hight of neural spines above middle of inferior border of 
centra in presacrals and above inferior border of posterior end in postsacrals. 
4. Cervical. .- 154 645 148 58 61 22 136 53 
8. at 210 8} 220 88 108 4 192 73 
9. ag ? ? ? ? ? ? ? ? 
10. G6 192 74 243 93 102 4 196 73 
11. ae Hi 8 238 98 ila 42 225 83 
112, a¢ 234 aoe 264 104 113 48 255 10 
13. a6 258 104 292 113 125 47 265 | 107% 
14, é¢ 268 * 103 112 43 
15. as 320 1 || | | 
2. Dorsal. 390 154 200 8 125 me 368 143 
3 be 374 143 120 43 127 5 499 16 
4, be 395 153 150 5t 115 4} 435 174 
i. of 390 152 135 54 124 43 483 19 
6. bg Heeal50 5a 109 4} 492 193 
7 a6 135 5h 116 ree O00, 193 
8 66 | 170 68 102 4 550 | 218 
9. 6 | 152 6 137 58 540 211 
10. ag 148 53 145 5am 558 | «(22 
hte ee | 143 58 175 62 585 | 
12. & eS 58 169 63 Bie) || Bil 
18, be J 35 5a 178 7 560, | 22 
14. te Vaal 5 415 170 63 552 213 
1. Caudal. 350 133 | 115 43 160 62 425 163 
2. a 310 123 80 3h 166 63 410 16} 
3. be iD) 3 165 64 393 15} 
4, He 83 34 157 64 355 142 
5. a 3 31 143 58 346 133 
6. a 90 34 130 54 331 13 
he “ 85 32 5h 313 12} 
133 
The Pectoral Arch. (Figs. 17, 18, 19.) 
Only the left scapula (Figs. 17 and 18) and right coracoid (Fig. 19) are preserved. 
The Coracoid (Fig. 19).— The external surface of this bone is regularly but 
gently convex. ‘The internal surface is concave. The anterior and inferior margins 
are for the most part thin, but at the antero-inferior angle the margin is thickened 
and presents an elongated rugosity shown at a 140 mm. in length and 40 mm. in 
