MESSRS. HANCOCK AND EMBLETON ON THE ANATOMY OF DORIS. 
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tracted penis ; p, mucus-gland in connection with female channel ; 
q, spermatheca ; r, vagina leading from external orifice to same ; .v, acces- 
sory spermatheca; supra-oesophageal ganglia giving off numerous nerves; 
u, gland-like body connected with vascular system. 
Fig. 2. Alimentary system of D. Johnstoni. a, buccal mass ; h, retractor muscles of 
channel of mouth ; c, c, salivary glands ; d, dilated portion of oesophagus ; 
e, true stomach ; f, intestine ; g, liver. 
Fig. 3. Portion of alimentary system, D. vei'rucosa. a, oesophagus ; 6, stomach ; 
c, pancreas; d, hepatic duct; e, intestine; f, liver. 
Fig. 4. Alimentary system, D. pilosa. a, channel of mouth ; h, anterior or gizzard- 
like portion of buccal mass; c, crop at commencement of oesophagus; 
e, dilated portion of oesophagus ; f, true stomach laid open, exposing 
on its interior surface the orifices of the hepatic duct ; g, pancreas ; 
h,h, intestine ; i, anus ; h, liver. 
Fig. 5. Alimentary system, &c., D. btlamellata, exhibiting renal organ laid open. 
a, channel of mouth ; b, buccal mass ; c, gizzard, opening into same ; 
d, salivary gland ; e, tubular portion of tongue ; /*, dilated portion of oeso- 
phagus ; g, liver ; h, h, intestine ; i, pancreas ; j, anus ; k, small orifice 
leading into renal cavity, a bristle is passed through this orifice into cavity; 
1,1, wall of renal organ laid open longitudinally, exhibiting a minute net- 
work of aortic twigs anastomosing with other branches from the portal 
trunk ; m, ventricle ; n, auricle ; o, portal heart ; p, portion of the floor of 
pericardium attached to same. 
Fig. 6. Tongue of D. pilosa removed from muscular support, a, anterior or exposed 
portion ; b, tubular portion. 
Fig. 7. Portion of same more highly magnified. 
Fig. 8. Central portion of two rows of spines from tongue of D. tiiberculata. 
Fig, 9. One of the spines from same tongue more highly magnified. 
Fig. 10. Outer portion of a row of spines from tongue of D. Johnstoni. 
Fig. 11. Central portion of two rows of spines from tongue of D. repanda, a, central, 
b, lateral spines. 
Fig. 12. An outer spine of same. 
Fig, 13. A spine next median line of same. 
Fig. 14. Two spines from tongue of D. aspera. 
PLATE XIII. 
Fig. 1. Side view of buccal mass, D. tuberculata. a, channel of mouth; b, buccal 
mass ; c, oesophagus ; d, lingual sac ; e, e, salivary glands ; f,f, muscles for 
retraction of channel of mouth ; g,g, muscles for retraction of buccal mass ; 
g', belt to which these are attached ; h, muscles for advancing buccal mass. 
