THE SNAIL. 



55 



PLATES XIII., XIV. 



THE SNAIL. 



n. Anas. 



a.fll. Albumen gland. 



i. !/!'. Duct of the same. 



al. Archenteron. 



ao. ' Aorta. 



mi' . Anterior aortic trunk. 



ao''. Posterior aortic trunk. 



. an. Auricle. 



mi, I. Auditory organ. 



and'. Auditory nerve. 



l>. Buccal nerve. 



//. Buccal ganglion. 



h.il'. Right bile-duct. 



li.d". Left bile-duct. 



W. Blastopore. 



b.ni. Buccal mass. 



r. Coluruella. 



e.r. Cleavage cavity. 



e.g. Cerebral ganglion, 



c/. Genital vestibule. 



c.m. Constrictor muscle. 



e.]>. Cerebro-pedal commissure. 



c.ps. Cerebro-splanchnic commissure. 



cr. Crop. 



er 1 . Its cut edge. 



d. Dart sac. 



d'. Valves of the same. 



(/". Spiculum amoris. 



d.m. Depressor muscles. 



tp. Epiblast. 



/. Foot. 



//. Flagellnm. 



g.a. Genital aperture. 



;/.(/. Genital duct. 



<;''. Groove at base of excretory orifice. 



</.*. Germinal spot. 



//.'. Ganglion of so-called olfactory tentacle. 



.'/''. Ganglion of optic tentacle. 



ij.f. Germinal vesicle. 



h. Heart. 



h.d. Hermaphrodite duct. 



h.d'. Aperture of the same. 



h.ijl. Ovotestis (hermaphrodite gland). 



li.nl'. Depression for the same. 



h.j. Horny jaw. 



lii/. Hypoblast. 



i. Intestine. 



i'. Origin of the same. 



/.///. Intrinsic muscles. 



I'. Circular lip. 



I". Lateral lip. 



Hi. Labial nerve. 



l.m. Leva tor muscle. 



l.x. Lateral blood sinus. 



l.t. Lateral (rachidian) teeth. 



If. So-called liver. 



/r'. Liver, right lobe. 



/c". Liver, left lobe. 



in. Mouth. 



m.ijl. Accessory glands. 



ins. Mesosoma. 



in.t. Median teeth (uncini). 



HC. Nucleus. 



n.c. Nerve collar. 



a. t. Nerve to tentacle. 



rt.t'. Nerve to optic tentacle. 



o.e. Odontophoral cartilage. 



od. Oviduct. 



tf. Oesophagus. 



op. Visual organ. 



op'. Optic nerve. 



ot. Otolithic mass. 



p. Peritreme. 



pc. Pericardium. 



pd. Pedal ganglion. 



pd'. Pedal nerves. 



/i.i/l. Pedal gland. 



/'/. Pulmonary sac. 



/it . Pulmonary chamber. 



pi'. Respiratory aperture. 



pl.m. Pallial muscle. 



/i. in. Protractor muscle. 



/ni. Penis. 



/i. n. Pallial nerve. 



