284. MEMOIRS OF THE CARNEGI£ MUSEUM. 
Vertical diameter of posterior face of centrum)... .)..5.......-.5.s55ses2s5556" 53 47 43 
Vertical diameter of posterior face of centrum including faces for heads of ribs.. 106 98 93 
Vertical drameterofimeuralicanaleart see ee ee ee ee 28 PH 24 
ADH O\Y Cres oMColIENonVarHare (ohn 1K UHEA CMM. 2 6s od So ohanodsconannosonacssnsnunoder 23 23 24 
Antero-posterior diameter of prezygapophyses....... Pee aan Aone tee S 20 16 15 
Transverse diameter of prezygapophyses..................0.ceesceeeseeess 19 r. 16, 1. 19 23 
Distancelacrossyprezyeapophysesmemen- eee hone eee ene nce 57 57 60 
Antero-posterior diameter of postzygapophyses.................2..-.2000- Py ves Was Ik ie 15 
Transverse diameter of postzygapophyses................-..00-0eseeeseeees 16 14 r. 30, 1. 25 
IDYENT KORO OAM INSES, bso ootooodh ban sopsoacugenedesocoososue 58 44 47 
Transverse diameter of anterior face for head of rib........................- 30 30 28 
Horizontal diameter of anterior face for head of rib......................... 33 30 28 
Vertical diameter of posterior face for head of rib........................... 35 36 80 
Horizontal diameter of posterior face for head of rib........................ 30 28 28 
Horizontal diameter of surface for tubercle of rib........................... 22 20 20 
Transverse diameter of surface for tubercle of rib..........................- 16 19 iy 
Transverse: diameter olpedicele,. cee yay ee ee nor ere een eee 39 34 30 
Amtiero=pOStenl Omid ameter Ole Celia atte ieee taint ane 30 26 22 
Distancelbebweenwacessorsneadlonenl beeen rena nnn i ie By il 2 ms IL Ve. 0) 
Height of spine from neural canal to extremity.........................+-.- 230 217 202 
Antero-posterior diameter of spine above neural canal......................- 40 32 33 
Antero-posterior diameter of spine at top.........--.....eee cect neces ences 40 34 28 
The Sixth Dorsal. 
Four specimens of the sixth dorsal of Moropus were recovered, Nos. 1604, 
1713, 1714, and 1715. Of these No. 1604 is more nearly perfect than any of the 
others, but has sustained some injuries. No. 1715, the smallest of the four, is 
likewise nearly perfect except for some crushing in the region of the postzygapo- 
physes. Nos. 1718 and 1714 have lost the epiphysial faces of the centra both 
before and behind, and 1713 is malformed, having apparently during the life of 
the animal received injuries leading to a shortening of the left pedicel and the 
consequent twisting of the dorsal spine to the left. The opening of the neural 
canal in this specimen is likewise from the same cause abnormal, its longest (verti- 
cal) axis being thrown toward the left side. 
The spine of the sixth dorsal is shorter than that of its predecessor, though 
elongated. It is not greatly diminished in its antero-posterior diameter at its 
extremity. The transverse process behind shows a deep longitudinal depression 
marking the posterior boundary of the nascent metapophysis, which lies on the 
upper side of the process as a ridge, terminating broadly at the outer tubercular 
extremity of the process in a mammillary protuberance which in this vertebra is 
separated from the lower part of the end of the process bearing the face for the 
