. Journal of morphology. 109 < no Figs. 109 and 110 Stage 9 of Cryptobranchus allegheniensis. Equatorialview and lower hemisphere of different eggs, showing cleavage pattern. Cameradrawings from preserved material. X 7. pole the cleavage furrows, both in living and preserved material,are sometimes both broad and deep, forming quite noticeablefissures; a similar condition is common in Amblystoma (Eycles-hymer 95). In Cryptobranchus this condition is in marked con-trast to the stage immediately preceding, in which the furrowsin this region were faint. In Necturus, on account of the varia-bili
. Journal of morphology. 109 < no Figs. 109 and 110 Stage 9 of Cryptobranchus allegheniensis. Equatorialview and lower hemisphere of different eggs, showing cleavage pattern. Cameradrawings from preserved material. X 7. pole the cleavage furrows, both in living and preserved material,are sometimes both broad and deep, forming quite noticeablefissures; a similar condition is common in Amblystoma (Eycles-hymer 95). In Cryptobranchus this condition is in marked con-trast to the stage immediately preceding, in which the furrowsin this region were faint. In Necturus, on account of the varia-bility of the third cleavage furrows, the biradial pattern of themacromeres is not so clearly expressed as in the egg of Crypto-branchus. Stage 10: {figs. Ill, 112 and 219). This stage, reached a dayor two later than Stage 9, immediately precedes the beginningof gastrulation. The micromeres at the upper pole are invisible 482 BERTRAM G. SMITH to the naked eye, and barely distinguishable with the magnifi-cation used for photo
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