Vol. 18, No. 78, p, 131. Fig. 2 as printed is a negative, so that areas which should have been dark are light. A replacement copy of the illustration is enclosed.
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Published online by Cambridge University Press: 30 January 2017
Vol. 18, No. 78, p, 131. Fig. 2 as printed is a negative, so that areas which should have been dark are light. A replacement copy of the illustration is enclosed.