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 aflferent sinus of 



ctenidium 

 Ant.Ao anterior aorta 

 Ant. P. A anterior pedal arteries 

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



anterior palliai nerves 

 A. Sj) arterial spaces of mantle 

 At area of teeth on lips 

 h, h' branches of right stomato- 

 gastric to aorta 

 P. C bupcal cartilages 

 Pg buccal , or anterior, salivary 



gland 

 Pg.P duct of buccal gland 

 Pg.D' aperture of duct of buccal 



gland 

 PI, C blood corpuscles 

 PI. S blood sinus 

 Pm buccal mass 

 bn, hn\ 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. G cerebro-pedal commissure 



G. PI. G cerebro-pleural commissure 



G. P. N circumpallial nerve 



G. P. S circumpallial sinus or vein 



Ct. G ctenidial ganglion 



67. iV, Gt.N', Ct.N" ctenidial 



nerves 

 ctn branches of ctenidial nerves 

 Gt. 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 

 P 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.P gonoduct (Fig. 23) 

 h branch of left stomatogastric 



nerve 

 hw nerves from cerebral ganglia to 



head wall 

 il, il' nerves to lips 

 Int. N nerve from visceral ganglion 

 ipn inferior pharyngeal nerves 



