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

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Abstract
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.”

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