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As several eminent naturalists have expressed doubts of the correctness of my in­terpretation of some of the facts described in the Memoir on the Belemnite and Belemnoteuthis, published in the Philosophical Transactions, Part II. 1848, I am in­duced to lay before the Royal Society the following additional observations in con­firmation of the opinions advanced in my previous communication on this subject. That distinguished naturalist, Mr. J. E. Gray, has especially controverted my state­ment that the phragmocone of the Belemnites of the Oxford Clay possessed a pair of elongated shelly processes, which extended beyond the peristome or upper border of the conical chambered shell; the aperture resembling in this respect that of cer­tain species of Ammonites. In the recently published "Catalogue of the Mollusca in the Collection of the British Museum ,” Mr. Gray remarks, “Dr. Mantell has figured a specimen which appears to have an elongated process on each side, like the processes on the sides of the mouth of certain Ammonites; but on examining his specimen I am very doubtful if this appearance does not arise from an accidental fracture of the upper part of the conical shell.”

XVIII. Supplementary observations on the structure of the belemnite and belemnoteuthis