70 



Int. = lutebtine (the coils are 

 numbered in Figs. 10(t and 

 b). 



I.L. = Inner lip (only a line is 

 shewn as neither lip comes 

 in median section). 



K.C. = Kidney cavity. 



Lab. = Labial commissure. 



Lat.St. = Lateral ('-cpipodial ") 

 streak. 



L. All. = (Morphologically left) 

 auricle. 



L.K. --= Left kidney. 



L.K.Ap. = External aperture of 

 left kidney. 



L.M.T. = Lesser mantle ten- 

 tacle. 



L.Ospli.G. = Left osphradial 

 ganglion. 



M. = Mantle or pallium. 



Mcp. = Micropylc. 



Mescn = IMcsenteron (endoder- 

 mic). 



Meso. = Foot rudiments (meso- 

 dermic) . 



M.Gang.C. = Multipolar ganglion 

 cell. 



M.T. = Pallial tentacle. 



Ann. = Mouth. 



M.T.N. = Nerve of pallial ten- 

 tacle. 



N.C. = Nuchal cavity. 



N.R. = Nuchal roof. 



N.ll.V. = Veinlets from nuchal 

 roof. 



Odont.C. = Odontophore cushion. 



Ocs.P. = Oesophageal pouch. 



O.L. = Outer lip. 



Op.N. = Optic nerve. 



Os. = Osphradium. 



Os.E. = Osphradial epithelium. 



Os2>h. G. = Osphradial ganglion. 



Ot. = Otocyst. 



Ot.'N. = Nerve of otocyst. 



P. = Pericardium. 



Fal.Gl. = Pallial gland-tissue. 



Pal.M. = Pallial muscle. 



I'al.N. = Nerve in mantle tissue. 



Pap. = Ridged papella or 



"lickcr." 

 Pap.Cr.F. = Papilla; of internal 



edge of transverse crop 



folds. 

 P.C. = Posterior cartilage of 



odontophore. 

 P. Cell. = Pigment cell of eye. 

 Ped. = Pedal nerve cord. 

 Ped.Anas. = Pedal anastomosis. 

 Ped.S. = Pedal sinus. 

 P'uj.Bd. = Pigment band. 

 PI. = Pleural ganglion. 

 Pl.Ped. = Pleuro-pedal connective. 

 Post. A. = Posterior artery. 

 P.Pal.N. = Posterior pallial nerve. 

 P.p.b.c. = Post palatal buccal 



cavity. 

 Pr.Tr. = Prototroch. 

 P. -V. Lobe. = Perivisceral lobe of 



right kidney. 

 P.Z. = Pigment zone of pigment 



cell of eye. 

 li. - Eectum. 

 Had. = Radula. 

 Rcct. = Rectal evagination of 



mid-gut. 

 E.G. ^ Rudimentary gill (cten- 



idium). 

 U.K. = Right kidney. 

 B.K.Ap. = External aperture of 



right kidney. 

 Pt.Osph.G. — Right osphradial 



ganglion . 



