KEYNELL: on CASSIDARIA liUGOSA. 299 



Fig. 6. — Liver, etc., showing entrance of hepatic ducts into stomach. 



Fig. 7. — Nephridium, its relation to the heart and ctenidium. The arrows show 



the approximate course of the intestine. 

 Figs. 8, 9.— In the text. 



Eeference Letters. 

 An. anus ; Ao. aorta ; Au. auricle ; £.M. front portion of buccal mass ; 

 Cf. ctenidium; Uf.V. efferent vessel ; Hpbr.G. hypobranchial glands; H.D'., 

 B.I)", hepatic ducts ; Inv. introvert; L. liver; L.E. left eye; L.S.I). left salivary 

 duct; L.S.G. left primary salivary gland; L.S.G'. left secondary salivary gland; 

 i.r. left tentacle; i/o. mouth ; l¥<. mantle ; iV"., iV"., iV'". nerves ; Ne., Ne. 

 nephridium; Ne.Gl. nephridial gland; N.O. nephridial opening; Oe. posterior 

 portion of buccal mass ; Oe. crop ; Oe". oesophagus ; Os. osphradium ; F. penis ; 

 Pb. proboscis ; P.P. penis papilla ; R. receptacuhim ; Re, rectum ; R.E. right eye ; 

 Rh. rhynchostome ; P.M. introvert retractor muscles ; R.S. respiratory syphon ; 

 R.S.B. right salivary duct; R.S.G. right primary salivary gland; R.S.G'. right 

 secondary salivary gland ; R. T. right tentacle ; <S'«. entrance of salivary duct into 

 the sacculations of posterior part of buccal mass ; S.D'., S.D". seminal duct; where 

 seminal duct has been divided, in life these two points are joined; S.D'". tract of 

 seminal duct through penis ; St. stomach ; Ts. testis ; V.B. vas deferens. 



