268 MEMOIRS OF THE CARNEGIE MUSEUM. 
sinus, the outer inferior margin of the lamina forming an almost straight marginal 
line from the posterior tubercle. Moreover this lamina is greatly produced back- 
wards at its posterior angle beyond the lower margin of the centrum in such a way 
as to leave a deep notch between it and the inferior lip of the posterior articulating 
surface of the centrum. The vertebrarterial foramen is greatly enlarged in di- 
ameter, while the portion of the upper lamina, which protects it externally, is much 
reduced in its antero-posterior diameter. Just behind the posterior tubercle of 
the transverse process on the upper surface of the posterior lamina is a deep cavity 
or oval fossa. The neural spine is higher and narrower both transversely and 
antero-posteriorly. 
MEASUREMENTS OF SIxTH CERVICAL VERTEBRA. 
No. 1604, 
mm. 
Greatest length from front margin of prezygapophyses to hind margin below measured between 
perpendicular: i245 2c cess ies ia eters one ee SE CEE ne ee ee eee 197 
Heightito top of neural spines... . a ee ee er OEE CE InE Ie ee eee 187 
ene thyoficentrumbalongsundersuraceaem ee een cee earn nar eet ire teen ee 160 
Antero-posterior diameter of pedicel we... creett oe ea OS eee ECE eee ere 55 
Diameter acressmacelol prez capOphiyces hese eerie rere rrr ren rere tenn ae rr 182 
Distance between faces of prezygapophyses above.............0..0ccccc cece cscs cscs cseseecs 42 
Diameter across\postzycapophy ses: pacts oneiaeicias oc nite eo Eee neer Cnr 165 
Distance between faces of postzygapophyses im front. ......... 0.00. cee cece eee eee eee esas 65 
Distancellbetweenspostzycapophiyses behind ees ess enna coe erre rennet tee 45 
Diameter across anterior extremities of transverse processeS..........-. 0-00 ceecee cece eeeeeee 115 
Diameter across posterior extremities of transverse processes... 2.2... 0000 eee ee cee eee eee eee 157 
Transverse diameter of articular faces of prezygapophyses......... +... eee eee cece eet e eee ees 75 
Supero-inferior diameter of articular faces of prezygapophyses..................2e sees ee eee eee 60 
Transverse diameter of articular faces of postzygapophyses................ 02. cece cece cease - (iB 
Supero-inferior diameter of articular faces of postzygapophyses.................---eeeeeeeeeee 60 
Vertical diameter of neural’ camall))... 23.05 Sacer On aceon Oe eee ee eee eee 30 
Transyverseidiameter/oi neural/canaly.. |. anc-cae Roe Eee nae Oe EEE Sen E eee 35 
Antero-posterior diameter of anterior articulating face of centrum....................--000 eee 52 
Transverse diameter of anterior articulating face of centrum...................20.eeeeeeeeeees 50 
Transverse diameter of posterior articulating face of centrum...................0.-.-eeeeeeee- 68 
Supero-inferior diameter of posterior articulating face of centrum.....................-+-+++5-- 80 
Vertical height of posterior end of centrum measured perpendicularly....................-..--. 50 
Greatest height of keel of centrum below transverse processes............... Paint Fale ae 6 
Distance of neural canal from bottom of keel of centrum at middle.....................--00005 45 
dransyerse diameteron neuralispine mi rOnU ene ners oe eee niet eee eet tetas 1 
Transverse diameter of neural spine above origin of postzygapophyses.................-.02-00- 15 
Antero-posterior diameteroh spinel OUeins Meee neererirrise ee eeise ae nearer ert 50 
Antero-posterior diameter of spine at upper extremity..................2...0---eee eee eee eee 25 
Height of spine from Oriinis 5 ).i oc 61 cic een arcee arte eye fe © ote sine io er chars neater meee tee Peart cat a 80 
Antero-posterior diameter of outer margin of transverse process. ...........0e eee eee eee e ee eee 70 
