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 



