30i 



the relics in the Gulf of St. Lawrence. I am thinking of 

 such locally occurring, southern species as Purpura (Polytropaj 

 lapillus L. and Littorina obtusata L. 



Postscript. 



From Dr. M. C. Engell I have just received a copy of a 

 note: «Eine nachtertiäre Wärmeperiode in Grönland», which 

 has been inserted in Dr. A. Petermann's Geogr. Mitteilungen 

 1905, Heft IV. It contains the statement that he has found 

 marine deposits with shells of molluscs at the east-side of the 

 Disco-Bay, and a chart on which these beds have been marked, 

 together with information regarding the deposits at Orpigsuit 

 (Orpigssôk). The rest of the note has been constructed over 

 verbal communications which I gave Dr. Engell when he de- 

 livered the collected shells. 



It would for several reasons have been desirable that Dr. 

 Engell had shown me his report of my words to him before 

 publishing it. Among others because «the warm period» in 

 his report is devoid of the necessary proof. Thus Dr. Engell 

 only writes: «Dieser Fund von Zirphaea hat Interesse, weil er 

 zeigt, dasz Grönland nach dem Beginn der Vergletscherung eine 

 wärmere Periode gehabt hat». I must have forgotten to inform 

 Dr. Engell about the reason why we are justified in attributing 

 the find of Zirphaea such a far reaching importance. 



I may now refer the reader whom Dr. Engell has deserted 

 on a burning point to p. 296 — 97 of the present treatise; there 

 will be found the explanation which is wanting in Dr. Engell's 

 representation. 



20* 



