MEMOlliS OF THE NATIONAL ACADEMY OF SCIENCES. 



is: 



Text-fig. 11.— THE LESSER AORTA AND ITS BRANCHES, VIEWED FROM THE DORSAL SIDE. 



1, radial pallia] artery. 



2, marginal pallia] artery. 



3, arteries of nidamental gland. 



4, rectal arteries. 



5, intestinal artery. 



6, heart. 



7, gonaducal artery. 

 .S. genital artery. 



9, right septal artery. 

 10, accessory siphuncular artery. 



1 1, siphuncular artery. 

 11', left septal artery. 



13, common septal artery. 



14, artery of pyriforni sac 



15, posterior viscero-pericardial aperture. 



16, dorsal aorta. 



17, lesser aorta. 

 IS, pallia! artery. 



19, branchio-osphradial artery. 



20, median pallia! arteries. 



