THE ANNALS AND MAGAZINE OF NATURAL HISTORY. [FOURTH SERIES.] No. 75. MARCH 1874. XXVII. — On the Structure called Eozoon canadense in the Laurentian Limestone of Canada. By H. J. Carter, F.R.S. &c. {A letter to Professor W. King, Sc.D., Galway.) My dear Sir, — On the 13th instant I had the pleasure to send you a " Card " acknowledging the safe arrival of your letter of the 10th inst. and specimen of Laurentian Limestone contain-ing the so-called Eozoon canadense, intimating at the same time that after a few days I would answer you more at length. I now proceed to do so. With the copy of your Papers* on the mineral origin of this formation (received on the 9th August last) and your present letter under reply, together Avith the decalcified slice of Laurentian Limestone (about 2x2x| inch in size), which you state to be from Canada and to have been forwarded to your colleague Professor Rowney by Dr. Carpenter as a " typical specimen of Eozoon canadense^'' I also possess in my own cabinet perhaps some of the most perfectly fossilized foraminiferous structure in existence ; so that, for the purpose of comparing the two, I could not be more satisfactorily pro-vided. That I should feel interested in the question at issue as to the identity of the Laurentian Limestone with that of fora-miniferous structure may be easily conceived by the accom-• ' Proceedings of the Royal Irish Academy,' vol. x. pp. 506-5-51, and 2nd series, vol. i. 1871. Ann. &Mn(j.N. Hist. Ser. 4. TW. xiii. 14
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