1890.] Classification of the Testudinata. 531 
Lydekker calles the whole order Chelonia, which he divides 
into two sub-orders, Athecata and Testudinata. 
The Athecata correspond to the Athece; the Testudinata 
contain four sections: 1. Amphichelydia; 2. Pleurodira; 3. Crypto- 
dira; 4. Trionychoidea. In the Amphichelydia are placed the 
Pleurosternide. “ This section is formed for the reception of cer- 
tain extinct Chelonians, mostly of Mesozoic age, which combine in 
a remarkable manner the characters of the two following sections 
[Cryptodira and Pleurodira], and may probably be regarded as the 
survivors of the earlier ancestral types from which those two 
sections took origin.” 
THE ORDINAL NAME FOR THE TORTOISES. 
Boulenger and Lydekker use the name Cheldhia; Zittel and 
Doderlein the name Testudinata. The name Chelonia has no 
right to stand, and must give place to that of Zestudinata, as will 
be seen from the following table: 
Boulenger, p. 4.—Order, Chelonia. 
Cheloniens, Brongniart, Brit. Soc. Philos., II., 1800. 
Testudinata, Oppel, Order Rep., 1811. 
Baur.—7estudinata, Klein, 1751. | 
1751. Zestudinata, Klein, Jac. Theod., Quadrupedum Dispositio 
brevisque Hist. Nat., 1751, p. 96. 
1799. Cheloniens, Brongn, Mag. Encycl. ou Journ. des Sci- 
ences, des Lettres et des Arts, par A. L. Millin, T. VI., An. VII., 
1799, pp. 184-201. 
1802. Testudines, Treviranus, G. R., Biologie, Bd. I., p. 260, 
Gottingen, 1802. 
1806. Testudines, Shaw, G., General Zool., Vol. IIL, Part 1., 
p- 5., London, 1802. 
1806. Chelonii, Dumeril, A. M. C., Zool. Anal., Paris, 1806, 
p. 76. 
4 Lydekker R., in Henry Alleyne Nicholson and Richard Lydekker. A Manual ot 
Paleontology, Vol. II., part IHI. Edinburgh and London, 1889, pp. ro82-1118. And 
Lydekker, Richard, Catalogue of the Fossil Reptilia and Amphibiain the British Museum 
(Natural History), Part 111., containing the order Chelonia. I.ondon, 1889. 

