Miscellaneous

Abstract

SIB,—In the GEOLOGICAL MAGAZINE for May, 1896, p. 199 (footnote 2), Mr. R. B. Newton calls attention to Ammonites mammillatum having been recorded from the Chloritic Marl in the Geological Survey Memoir on the Isle of Wight, second edition, p. 279, and suggests that there is a mistake. In this I think he is probably right. The table in the Memoir was drawn up in such a way as to show the authority for every fossil. A. mammillatum was inserted on the authority of Captain Ibbetson ("Note on the Geology and Chemical Composition of the various Strata in the Isle of Wight," 1849, p. 22), who quotes A. monile from the Chloritic Marl. A. monile, Sow., according to D'Orbigny (Pal. Franc. Terr. Cret. 1840-1, p. 249), Bronn (Index Pal. 1848, p. 51), and Morris (Cat. Brit. Foss. 1854, p. 297), is A. mammillatum, Schloth. The mistake probably lay in the determination of Ibbetson's specimen as A. monile. . „