Column Headings: _B. arnuxii._ B: New Brighton, New Zealand, 1868, (Flower). No. 3. _B. bairdii._ C: 49726 St. George Island, Alaska, female adult. D: 49725 Centerville, California, male(?) adult. E: 49727 St. George Island, Alaska, male young. B C D E mm. mm. mm. mm. Length of centra of seven cervicals 254 375 310 250 (inferior) Atlas: Breadth 292 362 341 280 Height ... 339 321 270 Fourth cervical: Greatest height ... [a]254 [a]249 [a]191 Greatest breadth ... [b]243 [b]197 [b]173 Length of centrum 36 47 34 30 Seventh cervical: Greatest height ... 310 270 198 Greatest breadth 241 257 235 177 Length of centrum 46 58 49 42 First thoracic: Greatest height ... 391 390 255 Greatest breadth ... 310 290 240 Length of centrum 58 84 68 51 Ninth thoracic: Greatest height ... 508 478 333 Greatest breadth ... 318 [c]218 198 Length of centrum 152 190 176 128 First lumbar: Greatest height ... 585 540 359 Greatest breadth ... 626 575 340 Length of centrum 163 228 215 150 Sixth lumbar: Greatest height ... 713 642 427 Greatest breadth ... 590 572 362 Length of centrum 206 273 243 172 First caudal: Greatest height ... 800 [d]658 427 Greatest breadth ... 577 [d]511 360 Length of centrum 246 338 [d]280 200 Ninth caudal: Greatest height ... 422 335 288 Greatest breadth ... 243 194 191 Length of centrum 168 241 194 160 Eleventh caudal, length of centrum 104 180 156 142 Length of scapula 503 710 670 395 Height of scapula 356 490 445 280 Length of humerus 274 ... 340 248 Breadth of humerus at distal end 109 ... 170 115 Length of radius 295 ...