HOLLAND AND PETERSON: OSTEOLOGY OF THE CHALICOTHEROIDEA. 
MEASUREMENTS OF FourTH CERVICAL VERTEBRA. 
265 
No. 1604, 
mm. 
Greatest length from front margin of prezygapophyses to hind margin below between perpendiculars. 195 
Flershtatostop Omneuralaspine sarees mer ait. sets ei cl accAls esha bioje se ea nics sidebiass ears Sars acas oben dis 147 
Henerbvoicentrumbaloncsthesunderisuriaces sr hen- saci esis cn od oe oe ieee eb rad doe telolts 165 
NING CEO-WOSteTLOIndiam EheTOlsPECICelem ew, Wri aie «oe eercks «ii piolese acl Siem nu a seseois «aakel ah pateostchabs 75 
WiamMetewackoss face OlpLezyPAapOphy Ses sie alee clean oe oe ee doh ne ee voles 158 
Distance between faces of prezygapophyses above................ eee cece eee eee e eee enna ees 32 
DiametenachossmaceloiepOsuzyCapopMysese plana days or ie setae ee Tle) sell seyeae las 170 
Distance between faces of postzygapophyses in front.................00. cece cece cere e esses 55 
Distance between faces of postzygapophyses behind................000...0ceceveeeesseeresses 38 
Diameter across anterior extremities of transverse processeS............0. 0000 cece e cece eee eee 120 
Diameter across posterior extremities of transverse processes... ........0 0. cece eee cece eee eee 180 
Transverse diameter of articular faces of prezygapophyses.............00.00 0c cee cece cece eeeee 65 
Supero-inferior diameter of articular faces of prezygapophyses..............-2000000ce eee eee eee 70 
Transverse diameter of articular faces of postzygapophyses............ 200.000 cece eee nsec neces 70 
Supero-inferior diameter of articular faces of postzygapophyses.................000ecc eee eeeee 63 
Wenticaldiameterorneunalmcanalecm a sai rae seca tan an eee ncn cie Sse Se atten as 4 tian 30 
pliansversediameterorneuralicanallge. (cya eis e econ ates cestode is eg se pea he eine wiclaee 30 
Antero-posterior diameter of anterior articulating face of centrum..................-..0..0000- 50 
Transverse diameter of anterior articulating face of centrum................20.:ec eee ee cee eees 45 
Transverse diameter of posterior articulating face of centrum................-.22--eeee eee eeee 65 
Vertical height of posterior end of centrum measured perpendicularly.......................... 50 
Greatest height of keel of centrum below transverse process...........00.0020 cece cece eee eeees 30 
Distanceroimeuraleanaluiromybottoma oi keellatamiddle: 2). see aden ae oe ieee 45 
Rransverserdiameternotmneuralespimeyim trom cies ss erence soe) ats eee yee caso ance aes 3 
Transverse diameter of neural spine at origin of postzygapophyses..................0000--e000- 30 
LNTUEROFDONOGON Chem We Oh HOM Ey Oulas gooounaccoacccudgoosenencnbedusccosoudnnecobuaes 65 
Antero-posterior diameter of spine at upper extremity...:.....-.::5.00-61--2-eeee tees eneasese 40 
LBUS Tee GUC SjevtaVe GARONA Opry Ae Ne A ene EN ye WET te ee egestas Ace Ue eed 45 
Antero-posterior diameter of outer margin of transverse process... . 0.2.2.0... ccc cece e ence eee 70 
diransverse:diamelemotavertebranterialycanale mae eich sacle lela sess el ieee ae ehln. 10 
Supero-milerordiameter ofsvertebranvertalicanalls ya -4scc- se ae ee lar ae sebe ane iiss iaie lee erik 20 
The Fifth Cervical Vertebra. 
The fifth cervical vertebra is well preserved in specimen No. 1604. In its 
general features it resembles its immediate predecessor. The transverse processes 
at their outer extremities increase in size, and the anterior tubercle becomes a 
broad thin process pointing downward and inward, while the posterior tubercle 
is a heavy process, subtriangular in section, extending outward and backward, 
strongly roughened at the end to provide muscular attachments. The posterior 
horizontal marginal sinus is shallower than in the fourth cervical. The neural 
spine is not quite as heavy as in the fourth cervical, and the keel of the centrum 
