Fig. 5. Embryo ideally unrolled at the stage when all the appendages have become established.
Fig. 6. Somewhat older stage, when the limbs begin to be jointed. Viewed from the side.
Fig. 7. Later stage, viewed from the side.
Fig. 7a. Same embryo as fig. 7, ideally unrolled.
Figs. 8a and 8b. View from the ventral surface and from the side of an embryo, after the ventral flexure has considerably advanced.
Fig. 9. Somewhat older embryo, viewed from the ventral surface.
PLATES 31 AND 32.
Complete List of Reference Letters.
ao. Aorta. ab.g. Abdominal nerve cord. ch. Cheliceræ. ch.g. Ganglion of cheliceræ. ep. Epiblast. hs. Hemispherical lobe of supra-œsophageal ganglion. ht. Heart. l.l. Lower lip. m. Muscles. me. Mesoblast. mes. Mesenteron. mp.g. Malpighian tube. ms. Mesoblastic somite. œ. Œsophagus. p.c. Pericardium. pd. Pedipalpi. pd.g. Ganglion of pedipalpi. pr. Proctodæum (rectum). pr.c. Primitive cumulus. s. Septum in abdomen. so. Somatopleure. sp. Splanchnopleure. st. Stomodæum. su. Suctorial apparatus. su.g. Supra-œsophageal ganglion. th.g. Thoracic ganglion. v.g. Ventral nerve cord. y.c. Cells derived from yolk. yk. Yolk. y.n. Nuclei of yolk cells.
Ig-IVg. Ganglia of ambulatory limbs. 1-16. Postoral segments.