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References to the Illustrations.
| PLATE I. | |
| Fig. 1 | see page 193. |
| Figs. 2 and 2a | see page„ 191. |
| Figs. 3 and 3a | see page„ 193. |
| Figs. 4 and 4a | see page„ 193. |
| Fig. 5 | see page„ 186. |
| Figs. 6 and 6a | see page„ 193. |
| PLATE II. | |
| Fig. 7 | see page 193. |
| Figs.8 and 8a | see page„ 192. |
| Figs. 9 and 9a | see page„ 191. |
| Figs. 10 and 10a | see page„ 192. |
| Figs. 11 | see page„ 186. |
| Figs 12 and 12a | see page„ 193. |
| Figs. 13 and 13a | see page„ 192. |
