The anatomy of Lottia gigantea Gray. 



61 



Explanation of the Plates. 



Plates 1 — 4. 



The following abbreviations have been used : 



A auricle 



a branch of right stomatogastric 

 nerve 



an anal opening 



act.n nerve to afferent sinus of 

 ctenidium 



Ant.Ao anterior aorta 



Ant. P. A anterior pedal arteries 



A.P.N, A. P.N' right and left 

 anterior pallial nerves 



A. Sp arterial spaces of mantle 



At area of teeth on lips 



b, b' branches of right stomato- 

 gastric to aorta 



P. C buccal cartilages 



Pg buccal, or anterior, salivary- 

 gland 



Pg.D duct of buccal gland 



Pg.D' aperture of duct of buccal 

 gland 



PI. C blood corpuscles 



PI. S blood sinus 



Pm buccal mass 



bn, bn', bn", bn'" nerves to buccal 

 mass from subradular connective 



P. S buccal sinus 



C. c cerebral commissure 



C branch of right stomatogastric 

 nerve to visceral artery 



Cd.N, Cd.N, Cd.N" nerves to 

 heart 



Ceph.A cephalic artery 



C. G cerebral ganglion 



Coe coelom, secondary body cavity 



C.Ped. C cerebro-pedal commissure 



C PI. C cerebro-pleural commissure 



C. P. N circumpallial nerve 



C. P. S circumpallial sinus or vein 



Ct. G ctenidial ganglion 



Ct.N, Ct.N', Ct.N" ctenidial 



nerves 

 ctn branches of ctenidial nerves 

 Ct. V efferent ctenidial vein 

 d branch of right stomatogastric 



nerve 

 Pf dorsal or greater folds of oeso- 

 phagus and pharynx 

 Pors.Pr dorsal branch of visceral 



artery 

 E eye 

 e branch of left stomatogastric to 



oesophagus 

 f branch of left stomatogastric in 



genital artery 

 g branch of left stomatogastric to 



intestine 

 Gen. A genital artery 

 Gn gonad 



Gn.D gonoduct (Fig. 23) 

 Ji branch of left stomatogastric 



nerve 

 hw nerves from cerebral ganglia to 



head wall 

 il, W nerves to lips 

 Int. N nerve from visceral ganglion 

 ipn inferior pharyngeal nerves 



