136 



COMFA RA TI VE A NA TO MY 



side, and this ganglion becomes the infraintestinal gangrlion. The 

 pleurovisceral connectives, in which these ganglia lie, now cross and 

 give rise to the condition called ehiastoneury. The visceral 



Figs. 113, 114, 115, 1 ii'..— Diagrams to illustrate the shifting forward of the pallial complex 

 along the right side of the body and the development of ehiastoneury. p, Month ; »/« , »//-/, 

 iilp, original left cerebral-, pleural-, and jiedal-ganglion ; idim, ki-jhi, oriyinal left and original riglit 

 parietal ganglion ; ula, original left auricle ; uos, iiros, original left and original right osiihradiuni ; 

 iilct, tirct, original left and original riglit ctenidium ; mh, ba.se of the mantle ; tnr, edge of the .same; 

 III, mantle cavity ; v, visceral ganglion ; ve, ventricle ; ", amis. 



ganglion in Avhich these connectives terminate posteriorly lies as 

 before under the intestine. 



It is unnecessary to show in detail how this displacement also affects 

 the heart and its auricles, the osphradia, and the nephridial aj^ertures. 



