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Rh 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.

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.

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