The anterior caudals possess wide diapophyses. Their articular faces are a vertical oval, a little contracted above, sometimes a straight outline. They present a peculiarly elongate form.

Length of axis (alone) 60 mm 100
Vertical diameter of ball 27 45
Transverse diameter of ball 27 45
Length of the mandible720100
Depth at coronoid process150 20.9

MEASUREMENTS OF CLIDASTES WESTII.

Length of dentary400 millim.
Depth opposite the first tooth 20
Depth opposite last tooth 62
Entire extent of mandible630
Greatest depth at coronoid process 95
2. Length of axis with odontoid process 80
Length of axis without odontoid process 70
Vertical diameter of ball 24
Transverse diameter of ball 33
4. Length of fourth cervical vertebra to rim of ball 49
Expanse of diapophyses 82
5. Length of fifth cervical to rim of ball 49
Transverse diameter of ball 35
Vertical diameter of ball 28
Expanse of diapophyses 90
8. Length of eighth vertebra to rim of ball 53
Expanse of diapophyses 90
14. Length to rim of ball 54
Transverse diameter of ball 40
Vertical diameter of ball 33
Expanse of diapophyses100
18. Length to rim of ball 50
Transverse diameter of ball 40
Vertical diameter of ball 36
Expanse of diapophyses100
23. Length to rim of ball 50
Transverse diameter of ball 41
Expanse of diapophyses100
25. Length to rim of ball 52
Transverse diameter of ball 43
Vertical diameter of ball 43
Expanse of diapophyses100
30. Length to rim of ball 54
Transverse diameter of ball 46

This species is named in memory of Judge E. P. West, lately deceased, to whom our Museum owes so much for his long, diligent and faithful labors in the collection and preparation of the geological material.

[Erratum]: P. 17, line 15, for “Edestosaurus,” read Clidastes, and in next line, strike out “Proc. Acad.” etc.