[1103] Page 276.
[1104] Page 460.
[1105] Page 599.
[1106] Forchhammer, Report British Assoc. 1844.
[1107] Fleming's Brit. Animals, p. 37; in which work other cases are enumerated.
[1108] Quart. Journ. of Lit. Sci., &c., No. xv., p. 172. Oct. 1819.
[1109] This specimen has been presented by Mr. Lonsdale to the Geological Society of London.
[1110] The most conspicuous of the bones represented within the shell in [fig. 107], appear to be the clavicle and coracoid bone. They are hollow; and for this reason resemble, at first sight, the bones of birds rather than of reptiles; for the latter have no medullary cavity. Prof. Owen, of the College of Surgeons, in order to elucidate this point, dissected for me a very young turtle, and found that the exterior portion only of the bones was ossified, the interior being still filled with cartilage. This cartilage soon dried up and shrank to a mere thread upon the evaporation of the spirits of wine in which the specimen had been preserved, so that in a short time the bones became as empty as those of birds.
[1111] Ehrenberg, Nat. und Bild. der Coralleninseln. &c., Berlin, 1834.
[1112] See Ehrenberg's work above cited, p. 751.