The nuatomy of Lucapinii crenulata. 475 



io the palliai sinus, which lies parallel to and in close proximity to 

 the artery. This blood does not pass through the gills before return- 

 ing to the heart. 



12) The pedal collectors form a close mesh-work of veins over the 

 inner surface of the foot (Fig. 3). 



13) The ctenidia are symmetrical. 



14) The cerebral ganglia are joined to the pleuro-pedal ganglia 

 by two pairs of connectives. 



15) The pleural and pedal ganglia are in the form of short chords 

 closely fused together along their whole length. 



16) A ganglionic nerve lies just within each osphradium. 



17) The circum-pallial cord, a chain of small ganglia encircling 

 the visceral cavity, is joined to the pleural chords by a great number 

 of connectives, each of which sends a small nerve to the epipodium. 



Leland Stanford jr. university, 

 May 1, 1901. 



