The fifth order, Chelonia, consists of four families:—
| 57. Testudinidæ | Land and fresh-water Tortoises. |
| 58. Chelydidæ | Fresh-water Turtles. |
| 59. Trionychidæ | Soft Turtles. |
| 60. Cheloniidæ | Sea Turtles. |
AMPHIBIA.
In the Amphibia I follow the classification of Professor Mivart, as given for a large part of the order in the Proceedings of the Zoological Society for 1869. For the remainder I follow Dr. Strauch, Dr. Günther, and a MSS. arrangement kindly furnished me by Professor Mivart.
The class is first divided into three groups or orders, and then into families as follows:—
Order I.—PSEUDOPHIDIA.
| Fam. | |
| 1. Cæciliadæ | Cæcilia. |
Order II.—BATRACHIA URODELA.
| 2. Sirenidæ | Siren. |
| 3. Proteidæ | Proteus. |
| 4. Amphiumidæ | Amphiuma. |
| 5. Menopomidæ | Giant Salamanders. |
| 6. Salamandridæ | Salamanders and Newts. |
Order III.—BATRACHIA ANOURA.