Copy letter from Robert William Frederick Harrison to Sir Ray Lankester, KCB, FRS, the Challenger Committee 'Application for volumes of the Challenger Reports. Will Sir Ray Lenkester kindly minute his opinion on the following application:- From Prof E Topsent, the University, Dijon: Vol. xiii, part 24 Calcarea. Vol. xi, part 31 Keratose. Vol. xx, part 59 Monaxonida. Vol. xxi, part 53 Hexactinellida. Vol. xxv, part 63 Tetractinellida.' 27 April 1912