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...the lateral semicircular canal in a human fetu.s 43 mm. crown-rump length (Carnegie Collection, No. 886, slide 42, section 3). The section is 100m thick and is ...the lateral semicircular canal in a human fetus 46 mm. crown-rump length (Carnegie Collection, No. 9.5, slide 72, section 1). The section i.s 100m thick and i