. The American journal of anatomy. DH Text Fig. 3. Text Fig. 4. Text Fig. 3. Section of embryo pig mm. long, through Ductus = Coelom. DH = Ductus hepaticus. Text Fig. 4. Section of embryo pig 4 mm. long at the beginning of theMesocardium posterior. (7 = Coelom. FM ^ Mesocardium posterior. SV =Sinus venosus. 0 = CEsophageal portion of head gut. PG = Respiratoryportion of the head gut. on the left side are evidences of the Eecessus pleuroperitonalis which,as described by Stoss, 92, may at this stage be followed through a fewsections. In a slightly later stage, 4 mm., for example,

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. The American journal of anatomy. DH Text Fig. 3. Text Fig. 4. Text Fig. 3. Section of embryo pig mm. long, through Ductus = Coelom. DH = Ductus hepaticus. Text Fig. 4. Section of embryo pig 4 mm. long at the beginning of theMesocardium posterior. (7 = Coelom. FM ^ Mesocardium posterior. SV =Sinus venosus. 0 = CEsophageal portion of head gut. PG = Respiratoryportion of the head gut. on the left side are evidences of the Eecessus pleuroperitonalis which,as described by Stoss, 92, may at this stage be followed through a fewsections. In a slightly later stage, 4 mm., for example, the embryo shows thenext step in the development of the respiratory apparatus. The headgut is more symmetrical with reference to the median longitudinal plane(Figs. 4, 5, 6). In the upper portion below the gill pouches, a longi-tudinal fissure appears on either side dividing it now into well-markeddorsal and ventral segments giving the gut in the respiratory level, moreor less of an hour-glass appearance in transsections. These f

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Keywords: ., bookcentury1900, bookdecade1900, booksubjectanatomy, bookyear1901