Expeditions organized or participated in by the Smithsonian . Fig. 29.— Peanut shells on living vegetation, Key West. by Bartsch. changes should take place in the later whorls, which have not as yetl)een developed. The largest specimens found have only seven post-nuclear wdiorls, leaving two to three whorls still to Ije developed, andthese mid<e uj) fullv half of the length of the shell. If tlie jtresent 3 30 SMITHSONIAN AIISCELLANEOUS COLLECTIONS VOL. 63. \ W^% N<^

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectscienti, bookyear1912