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16. shell imposes a natural limit. The following table is compiled on the 1928 collection: ^[[Table I.]] Distribution of cavities on different parts of the plastron. Part of plastron | Cat. No. | No of Cavities. Endoplastron | 1.0.0398 | 3 ditto | 1.0.0426 | 2 Epi---(left) | 1.0.0417 | 1 Epi---(right) | 1.0.0417 | 1 Hyo---(left) | 1.0.0454 | 1 | 1.0.0482 | 2 | 1.0.0486 | 3 | a gift | 5 Hyo---(right) | 1.0.0395 | 2 | 1.0.0418 | 4 Hypo--(left) | 1.0.0421 | 5 | a gift | 6 Hypo--(right) | 1.0.0453 | 7 Hypoplaston(rt) | 1.0.0517 | 5 | 1.0.0458 | 1 | 1.0.0420 | 12 Xiphi---(left) | 1.0.0434 | 3 | 1.0.0454 | 1 | 1.0.0459 | 4 Xiphi---(right) | 1.0.0107 | 5 The following notes may be appended to the above table. 1. As the parts of the bony plate of a plastron are symmetrically arranged, the comp^[[l]]imentary parts are found usually bearing the same number of cavities. 2. The number of cavities on the hyoplastrons is usually the same as those on the hypoplastron; sometime there is a difference