611.013 C280 v.9 Wheeler, Theodora ... Variability in the spinal colunn as regards defective neural arches (rudimentary spina bifida) By Theodora Wheeler... with eleven figures. (In Garnegie institution of Washington. Contributions to embryology. Washington, 1920. 29 x 23 cm. vol, p. 95-107. illus., pl.) Contributions to embryology, no. 30 Running titles: Rudimentary spina bifida Bibliography: p. 107