The Journal of experimental zoology . JJ. with the substratum are indicated and continuous with these is thethin membrane dorsal to the old pharynx. A few days later the old pharyngeal tissue dropped off, but thewalls of the old pharyngeal pouch had already united with thebody-wall so that when the pharynx fell away an opening facingpostero-ventrally remained. The condition of the piece twenty-one days after section isshown in Fig. 34. The regenerating posterior region has elongatedconsiderably and only its posterior third is double. The regen-erated pharynx, like the body, is duplicated poste
The Journal of experimental zoology . JJ. with the substratum are indicated and continuous with these is thethin membrane dorsal to the old pharynx. A few days later the old pharyngeal tissue dropped off, but thewalls of the old pharyngeal pouch had already united with thebody-wall so that when the pharynx fell away an opening facingpostero-ventrally remained. The condition of the piece twenty-one days after section isshown in Fig. 34. The regenerating posterior region has elongatedconsiderably and only its posterior third is double. The regen-erated pharynx, like the body, is duplicated posteriorly. Therelations of parts are more clearly shown in the enlarged diagrams35 and 36. In Fig. 35, a dorsal view, it is seen that union between Studies on Regulation. 275 the two tails extends further posteriorly on the dorsal side than onthe ventral; the region between the tw^o longitudinal dotted linesin Fig. 35 is not in contact with the substratum as the animalcreeps and at the anterior end of this space betw^een the two tailsthe op
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Keywords: ., bookauthorwi, bookcentury1900, bookdecade1900, booksubjectzoology
