iui. OBGlUfl "i i i 



F:~ 2G2. Cross section thioufh the anterior part of tl e tr :nk of an embry of Scylliur. 



i OUR. 



TI tlu- dorsal wall of the trunk and its ventral wall, where the attachment of the stalk 

 of the yolk-sac is cut. there is stretch. - 1 . ! ular mesentery, which completely 



s the body-cavity into right and left halves. Within the mesentc 

 (,//'), from whi. li tl..- fundunent of the pancreas (pan) is given off donally and thai 

 incut of the liver </'./. ;< twice out through. In addition, the place where the 



% it.'lliu.- duct .uu.l.ili.Ml canal] (mc) joins the duodenum i* risible. 



i .in;il cord ; t.pg, ganglion of posterior root ; ar, anterior root ; dm, dorsally directed nenre 

 .-lirinxin- from tin- |.,t.-r..,r r .-.t ; ... muscle plate ; mp', part of the muscle-plate already 

 .-. .UN .!'-. I into muscleti ; mp.l, iii t <ives rise to the moicles 



limbs ; l, nervus lateralis ; no, aorta ; cA. chorda ; $y.g, sympathetic ganglion ; co. r, cardinal 

 \cin ; fp.n, spin vl nerve ; til, m 'iric) dact ; tt, segmental rube. 



