volume xxiii, pp. 314, 315.--ED.
[48] See Plate 51, in the accompanying atlas, our volume xxv.--ED.
[49] See Plate 46, in the accompanying atlas, our volume xxv.--ED.
[50] See Plate 55, in the accompanying atlas, our volume xxv.--ED.
[51] See Plate 54, figure 1, in the accompanying atlas, our volume xxv.--ED.
[52] See our volume xiv, pp. 282, 283.--ED.