. Journal of morphology . Ib JOIKNAL OF MOItPHOLOGY. VOL. XX, No. 4. Plate 25 and 2G. Two stages of many-coll blastnla from the 27. Same stage as Fig. 2(5 from 28. Blastopore formation. Crescentic 29. Later blastopore stage. Fig. 30. Very early medullary plate, blastopore remains as a small 31. Early medullary groove, medullai-y folds 32. Medullary folds 33. Later stage than Fig. 32. Fig. 34. Caudal end of stage shown in Fig. 33. Closure of neural folds atthe caudal 35 and 3G. Later stages of closure of neu


. Journal of morphology . Ib JOIKNAL OF MOItPHOLOGY. VOL. XX, No. 4. Plate 25 and 2G. Two stages of many-coll blastnla from the 27. Same stage as Fig. 2(5 from 28. Blastopore formation. Crescentic 29. Later blastopore stage. Fig. 30. Very early medullary plate, blastopore remains as a small 31. Early medullary groove, medullai-y folds 32. Medullary folds 33. Later stage than Fig. 32. Fig. 34. Caudal end of stage shown in Fig. 33. Closure of neural folds atthe caudal 35 and 3G. Later stages of closure of neural folds. EARLY DEVELOPMENT OF DESMOGNATHUS FUSCA. WILLIAM A. HILTON. PLATE


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