=C. dispar.= The articular faces in the cervicals are a broad transverse oval, faintly emarginated above for the neural canal. In the dorsals and lumbars the cup continues transverse, and the emargination is deeper, but in the anterior caudals the outline becomes a vertical oval. There appears to have been thirteen mandibular teeth. Length of axis with odontoid process 32 lines 100 Width between diapophyses 26.8 103 Length from edge of cup to end of ball in eleventh vertebra 25 100 Width of ball 14 56 Depth of ball 12 43 =C. Wymani.= In the cervical vertebrae, the outline of the articular faces is transversely cordate. The centra of the anterior dorsals are elongate, and much constricted behind the diapophyses. In the anterior caudals, the articular faces are a broad vertical oval. Length of axis with odontoid process 19 lines 100 Width between diapophyses 17 89.4 Width of ball 8 42.1 Depth of ball 7 36.7 Length of sixth cervical, without ball 13 100 Width of cup 9 69.1 =C. rex.= The cervical vertebrae have very broad, transversely oval faces, with indications of emargination. The dorsals are elongated, with transverse faces, and a distinct superior excavation for neural canal. The articular ends of the anterior caudals are vertically oval. Length of posterior cervical vertebrae 44 mm 100 Vertical diameter of ball 24 54.5 Transverse diameter 29.5 67 Length of a dorsal vertebra 52 =C. stenops.= 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 mandible 720 100 Depth at coronoid process 150 20.9 MEASUREMENTS OF CLIDASTES WESTII.