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Dec. 23d 1841. Mr. G. Sowerby showed me very flat, convex — smooth, excessively striated even lacinated — one end prolonged & overhanging apex. wh. he believes Patellæ all same species from C. of Good Hope.— thinks so from perfection of series, & from finding apex of one form & circumf of other. Believes the C. of Good Hope species varies more than the C. Horn one — English ones vary — All species vary except those not well known — Believes the most diverse forms may come from same brood. — effects of kind of attachment — & therefore not true variation, because not

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inherited & mere effect of locality on individual. (By way will not this be good definition of variety from (zz) race). Sowerby says all fixed shells vary, however fixed — but did not seem to know or remember any others that did, !! surely wrong =

Mem. one only requires the same amount of variation which the truest breed gives to select forms very different.— one requires far less =