65. 



g. Gill, 



gd. Genital duct, 



li. Heart . 



ie. Inner end of exoretorv organ. 



ip. Interpolated plate, 



lbs. IjOVT-er blood space. 



11. Left lobe of liver. 



11m Lower longitudinal imiscle. 



Im. Longitudinal muscle. 



Ip. Labial palp. 



mco. Cornrion opening of tlio excreto^'y organ and genital duct 



into tJie :nantle chamber, 



mg. Mid-gat. 



np. Jifascles of tlie gill plates, 



oe. Outer end of the excretory organ, 



on. Ospliradial nerve, 



ot. Otocyst. 



pa. Posterior adductor muscle. 



pap. Palp appendage, 



pc. Pericardial wall. 



pe. Posterior expansion of the mantle margin, 



pfm. Posterior foot muscles, 



pg. Pedal ganglion. 



