on, a 
BY T. HARVEY JOHNSTON AND OTTO S. HIRSCHFELD. 81] 
horny layer of peduncle : /.m., lateralis muscle ; m., muscle ; m.p., muscul- 
ature of peduncle; n., nephridium ; nst., nephrostome: 0.m.e., external 
oblique muscle ; 0.m.7., internal obliqte muscle ; 0.m.m., median oblique 
muscle; oc.m., occlusor (anterior occlusor) muscles; 0c.m.e., external 
occlusor ; 0¢.m.i., internal occlusor ; of., otocysé; .c., posterior canal of 
brachium ; p.v.c., pervisceral ccelome ; s.7., straight portion of intestine ; 
u.m., umbonal (posterior occlusor) muscle ; v./., ventral portion of “‘liver”’; 
v.v., ventral valve; 2., marks limits of aperture through which the 
peduncle passes to its insertion into the ventral valve. 
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