MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



183 



Text-fir. 10.- 



-THE DORSAL AORTA, THE GENITAL AND GONADUCAL ARTERIES, AND THE ARTERY 

 OF THE PYRIFORM SAC VIEWED FROM THE DORSAL SIDE. 



This figure and the one following are combinations of the results of my own dissections, and the figures of various 

 parts of the vascular system published by Willey. 



1, left artery of Van per IIoEVEx'sorgan in the male 



inferior labial lobe in the female. 



2, superior mandibular artery. 



.'?. right artery of Van der Hoeve.-'s organ in the m 

 of inferior labial lobe in the fei iale. 



4, arteries to individual digital tentacles. 



5, right tentacular artery. 



6, arteries of eye. 



7, infundibular artery. 



8, pedal artery. 



9, innominate artery. 



10, artery entering posterior part of hood. 



11, right anterior columella! artery. 



12, right anterior proventricular artery. 



13, nuchal artery. 



14, crural artery. 



15, marginal pallial artery. 



16, right pallio-nuchal artery. 



17, branch to dorsal body-wall. 



18, right posterior columellar artery. 

 l!». lesser aorta. 



20, heart. 



21, gonaducal artery. 



22, branch to wall of gonad. 



23, outline of genital duct. 



24, genital artery. 



artery of right lobes of liver. 



outline of gonad. 



gastric artery. 



ccecal artery. 



artery to middle portion of liver. 



arteries to left lobes of liver. 



dorsal aorta. 



hepatic artery. 



posterior proventricular artery. 



bepatico-columellar artery. 



outline of pyriform sac. 



artery of pyriform sac 



left posterior columellar artery. 



descending portion of columellar artery giving off 



branches to muscle, 

 left pallio-nuchal artery, 

 marginal pallial artery. 

 radial pallial artery, 

 artery to dorsal portion oi mantle. 

 dorsal aorta. 



left anterior proventricular artery. 

 cerebral artery. 

 buccal artery, 

 inferior mandibular artery, 

 labial arterv. 



