_ch._ Cheliceræ. _ch.g._ Ganglion of cheliceræ. _c.l._ Caudal lobe. _p.c._
Primitive cumulus. _pd._ Pedipalpi. _pr.l._ Præoral lobe. _pp_{1}. _pp_{2}.
_etc._ Provisional appendages. _sp._ Spinnerets. _st._ Stomodæum.
I-IV. Ambulatory appendages. 1-16. Postoral segments.
Fig. 1. Ovum, with primitive cumulus and streak proceeding from it.
Fig. 2. Somewhat later stage, in which the primitive cumulus is still
visible. Near the opposite end of the blastoderm is a white area, which is
probably the rudiment of the procephalic lobe.
Fig. 3_a_ and 3_b_. View of an embryo from the ventral surface and from the
side when six segments have become established.
Fig. 4. View of an embryo, ideally unrolled, when the first rudiments of
the appendages become visible.
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. 7_a_. Same embryo as fig. 7, ideally unrolled.
Figs. 8_a_ and 8_b_. 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.