MESSRS. HANCOCK AND EMBLETON ON THE ANATOMY OF DORIS. 247 
Fig. 10. Group of spines from same, still more highly magnified. 
Fig. IL Two of same spines, yet more highly enlarged. 
Fig. 12. Corneous jaws removed from buccal lip. a, anterior, free, exposed points ; 
h, extremity buried in buccal lip. 
Fig. 13. Stomach and hepatic duct of D. tuherculata laid open, a, stomach ; b, oeso- 
phagus ; c, pancreas ; d, liver ; e, great biliary duct laid open exposing 
numerous orifices leading into it from the liver ; f, cardiac orifice ; 
g, opening of pancreatic duct. 
PLATE XIV. 
Fig. 1. Lingua] sac of D. tuherculata projecting from buccal mass behind, a, poste- 
rior extremity of same ; h, line of section h ; c, line of section c. 
Fig. 2. Section b of lingual sac, explanatory of growth of spines, a, fleshy septum 
extending the whole length of tubular portion of tongue; b, membrane of 
sac; c, membrane supporting the spines; d, inner or lining membrane; 
e, the spines lying between the two last membranes and imbedded in a soft 
flocciilent matter; f, point where septum joins bottom of sac; g, vacant 
space between lining membrane of tongue and fleshy septum. 
Fig. 3. Section c of lingual sac. a, fleshy septum ; h, muscles of buccal mass ; 
c, membrane of sac ; d, dentigerous membrane ; e, teeth or spines ; /, lining 
membrane ; g, space between lining membrane and septum. 
Fig. 4. A portion of membrane from root of renal organ, D. pilosa, exhibiting injected 
a fine arterial plexus. 
Fig. 5. Inner surface of a portion of same membrane of renal organ, Z). repanda, 
considerably magnified, exhibiting the tracks of the arterial branches 
thickly covered with a glandular substance. 
Fig. 6. Portion of same membrane more highly magnified, showing the structure of 
the glandular substance, which is extended over it as well as over the 
vessels. 
Fig. 7. Generative organs of D. tuberculata spread out to show the connection of the 
parts, a, inner sac of penis leading to external orifice; b, retracted penis; 
c, fine tube passing from testis to extremity of intromittent organ ; d, testis ; 
e, ovary spread over liver ; /, oviduct ; g, dilated portion of same ; h, point 
where it is united to testis ; i, point of its union with duct from sperma- 
theca; j, female channel leading to external opening; h, opake portion of 
mucus-gland; /, semipellucid portion of same; m, vagina leading from 
external orifice to spermatheca n ; o, duct from spermatheca to oviduct ; 
р, accessory spermatheca connected to duct of spermatheca. 
Fig. 8. Generative organs, D. hilamellata. a, retracted intromittent organ ; b, testis ; 
с, oviduct as it leaves ovary ; d, dilated portion of oviduct ; e, contracted 
MDCCCLII. 2 K 
