Page:Parasaurolophus walkeri, a new genus and species of trachodont dinosaur.pdf/23

narrower and resembles those of the undoubted caudals. The chief reason why this vertebra is regarded as a sacro-caudal is the length of the centrum, which is 120 mm., as compared with 90 mm. for the first true caudal.

MEASUREMENTS OF SACRAL VERTEBRAE

---

---

Sacral vertebra No.	Neural spines		Diapophysis
	Length, mm.	Width, mm.	Height from base of neural spine, mm.
1	310	90	140
2	310	90	160
3	305	80	150
4	310	85	150
5	330	80	145
6	370	–	200
7	405	65	170

---

Caudal vertebrae—Only four caudal vertebrae are perfectly preserved, but parts of the fifth and sixth are present: these have been restored in the mount, but are not referred to in the measurements given below.

MEASUREMENTS OF CAUDAL VERTEBRAE

---

---

Caudal vertebra No.	Length of centrum, mm.	Neural spine		Diapophysis Length, mm.
		Length mm.	Width mm.	From base of sp.	From centrum
1	90	415	60	150	–
2	80	410	60	160	105
3	80	400	60	140	80
4	80	390	50	125	72

---

The 41st centrum, the only one measurable, is 80 mm. long, 150 mm. high, and 72 mm. wide.