Fig. 4. Section through the solid œsophagus during stage L. Zeiss A, ocul. 1. The section is taken through the region of the heart, so that the cavity of the auricle (aur) lies immediately below the œsophagus.
Fig. 5. Optical section of the tail of an embryo between stages I and K, shewing the junction between the neural and alimentary canals.
Fig. 6. Four sections through the caudal region of an embryo belonging to stage K, shewing the condition of the postanal section of the alimentary tract. Zeiss A, ocul. 2. An explanation of these figures is given on p. [449].
Fig. 7. Section through the interrenal body of a Scyllium embryo belonging to stage Q. Zeiss C, ocul. 2.
Fig. 8. Portion of a section of the interrenal body of an adult Scyllium. Zeiss C, ocul. 2.
[303] Archiv f. Mic. Anat. Vol. XIII. pp. 194, 195.
[305] This Edition, No. VII. p. [152].
[306] Vide Gasser, Entwicklungsgeschichte der Allantois, etc.
[307] Jenaische Zeitschrift, Vol. VI.