Copy letter from Robert William Frederick Harrison, to H M Vernon, Concilium Bibliographicum, Zurich-Obstrass, Switzerland In reply to Vernon's letter of the 27th June, Harrison sends herewith pages 72-78 of Vernon's paper on hybrid and parent forms of Echinoid Larvae, in order that page 75 may be modified in accordance with the recommendation of the Committee. Shall be glad to have the pages of manuscript back at Vernon's early convenience. 1 July 1898