Title: Bulletin of the Museum of Comparative Zoology at Harvard College
<p>Identifier: bulletinofmuseum33harv
Year: 1899 (1890s)
Authors: Harvard University. Museum of Comparative Zoology
Subjects: Zoology
Publisher: Cambridge, Mass. : The Museum
Contributing Library: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
Digitizing Sponsor: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
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106 BULLETIN: MUSEUM OF COMPAKATIVE ZOOLOGY. reef, but also a barrier reef of a triangular shape surrounding it. It is evident that this barrier has been formed upon the denuded and eroded spurs of Totoya, which once extended seaward from the outer rim of the volcano. Supposing, now, that the erosion of both Thombia and Totoya had continued for a period of time long enough to have reduced the rims of these volcanoes to the level of the sea, we should have, as soon as corals had covered the flats thus formed indicating the former existence of the rim, atolls of nearly circular form ; the one with a circumference of only two miles, and a depth of 24 fathoms, without patches in the central lagoon; the other much larger, more tlian 25 miles in circumference, having a depth of 34 fathoms inside the lagoon, which would be dotted with patches, some of them forming part of the rim, others being the remains of eroded spurs extending towards the centre of the extinct crater. Admiral Wharton ^ has given a most interesting sketch of Clipperton Atoll, in which he confirms the trachytic nature of the " Eock " of Clip-
</p><p>Text Appearing After Image: 
CLIPPERTON ROCK. (From a Photograph by J. T. Arundel.) perton, as determined by Professor Wolff ^ from specimens collected by Mr. Jensen and kindly sent me by Professor Davidson. The photo- graphs and specimens collected by Mr. J. T. Arundel, on which Admiral Wharton's notice is based, have enabled him to give what seems to me a natural explanation of the character of the atoll. As he says, it is 1 Quart. Journ. Geol. Soc. of London, May, 1898, p. 228. 2 Bull. Mus. Comp. Zool., Vol. XXVL No. 1, p. 174, 1894.
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