HOLLAND AND PETERSON: OSTEOLOGY OF THE CHALICOTHEROIDEA, 313 
vertically. The transverse diameter of the posterior face is greater than that of 
the anterior face. The outline of the anterior face is very bluntly cordate; of 
the posterior face transversely elongated oval. The spine inclines backward 
somewhat more than is the case in the fourth lumbar, and is somewhat shorter 
than in that vertebra. It is greatly thickened at its extremity and widened antero- 
posteriorly. The backward inclination of the spine is greater in M. petersoni than 
in M. elatus. 
MEASUREMENTS OF FirtH LUMBAR VERTEBRA.4 
1708, 1703C, 1713, 1714A, 
mm. mm. mm. mm. 
Greatest height from base of centrum to top of spine...............-....000-5- 268 201 240 145 
Greatest transverse diameter measured across transverse processes.............. 225 184 210 130 
Greatest antero-posterior diameter measured from front of prezygapophyses to 
DACKROL POSt Ay Map OplySeS reer atse sen kcesealeie meses teres Une oesercin tena oeeete 125 105 105 70 
Length of centrum along floor of neural’'canal..........)...2....22---:2-:3+0: 75 62 67 45 
Length of centrum along inferior surface................2. 00... eee eee eee eee 60 56 60 38 
Vertical diameter of anterior face of centrum...................-.+..-+-+-.--. 57 44 55 40 
Transverse diameter of anterior face of centrum...............-....0..-02-00- 8&8 67 78 58 
Vertical diameter of posterior face of centrum................--..0..-.00 ee eee 65 49 60 38 
Transverse diameter of posterior face of centrum.....................+-222-5- 105 79 98 64 
Merticalsdiametenofsmeunalicamale 2 2ecce secrete eo) etn So ete 25 25 26 24 
Aransverseraiameterofmeunralicamally nya serie re nivel nae areal Sere erie aie 82 3l 31 27 
Antero-posterior diameter of prezygapophysial surfaces......................-- 38 26 35 17 
Vertical diameter of prezygapophysial surfaces...............---..-.-+2e00-s- 88 27 37 20 
Distances between prezygapophysial surfaces above.....................-..0-- 58 35 50 48 
Antero-posterior diameter of postzygapophyses.................0-.ce eee eeeee 33 23 26 17 
Vertical diameter of postzygapophyses............. 0.00 eee eee eee eee 31 20 34 22 
Distance across postzygapophyses above....... 0.0.0... cee eee eee cee eee 55 54 54 42 
ARrANsVeTSerararne Lely Ol edi Cel ume pean Rest made rn: nok br Out evi parc tew ene 18 12 15 10 
Antero-posterior diameter of pedicel................. 2... c cece eee eee eee 52 47 46 35 
Height of spine from neural canal to extremity.....................0...0-000. 180 142 1638 75 
Antero-posterior diameter of spine above neural canal......................... 65 48 60 38 
Antero-posterior diameter of spine at top............. 0.0.0.0 0 cee cee eee 48 42 56 34 
Height of metapophysis above prezygapophysial face......................... 15 10 12 8 
Height of metapophysis above transverse process...............0.0-0.0.00 000s 7 55 63 41 
Antero-posterior diameter of metapophysis below............................. 52 29 35 25 
Antero-posterior diameter of metapophysis (mammillary) at end 
Distancesacross endsjommetanoplysesee neice cis ca a es oe ee oe oe 120 Gomme Old 70 
The Sixth Lumbar Vertebra. 
Specimen No. 1708 was again resorted to in furnishing material for a restora- 
tion to be used in connection with the mounted specimen. Fortunately the 
centrum of this specimen was well preserved with the exception of the extremities 
“4 Figures in italics denote approximate measurements, the specimens having been restored or broken. 
