. Journal of morphology . Fig. 32.—Larval Fig. 33.—Larval of Morphology.—Vol. XX, No. 4. Fig. 34.—Larval Choudrotus. Plate IV. Fig. 35. Ambystoma punctatiim, adult. Section farther caudad than Operculum, opercular muscle and recessus perilymphaticus are shown. Fig. 36. Chondrotus tenebrosus, transformation period. Section throughstilus columell?e and the cephalic end of the developing operculum. Fig. 37. Ambystoma punctatum, transforming. Horizontal section show-ing columella, stilus, squamoso-columellar ligament, the developing operculumand the M. opercu
. Journal of morphology . Fig. 32.—Larval Fig. 33.—Larval of Morphology.—Vol. XX, No. 4. Fig. 34.—Larval Choudrotus. Plate IV. Fig. 35. Ambystoma punctatiim, adult. Section farther caudad than Operculum, opercular muscle and recessus perilymphaticus are shown. Fig. 36. Chondrotus tenebrosus, transformation period. Section throughstilus columell?e and the cephalic end of the developing operculum. Fig. 37. Ambystoma punctatum, transforming. Horizontal section show-ing columella, stilus, squamoso-columellar ligament, the developing operculumand the M. opercularis attached in front to the opercular plate and behindto the suprascapula. Fig. 38. Chondrotus tenebrosus, transformation period. Section farthercaudad than Fig. 36. It shows the columella. The operculum is partially cutout from the floor of the ear capsule. Fig. 39. Ambystoma punctatum, embryo 13-14 mm. in length. The colu-mella consists of a mass of cells against the membrane of the fenestra andconnected by a strand of dense tissue with th
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