56 



ATLAS OF BIOLOGY. 



pr. Prostate. 



p.s. So-called Parieto-splanchnic ganglion. 



p.v. Afferent pulmonary vessels. 



p.v'. Efferent pulmonary vessels. 



r. Rectum. 



r'. Cut edge of the same. 



rd. Radula. 



rd'. Sac of the radula. 



re. Renal organ. 



re 1 . Renal duct. 



re". Renal aperture. 



r.m, Columellar (retractor) muscles. 



r.m '. Retractor pedis muscle. 



r.m". Retractor muscle of buccal mass. 



r.p. Retractor muscle of penis. 



r.t. Retractor muscle of tentacle. 



r.v. Afferent renal vessels. 



r.t)'. Efferent renal vessels. 



s. Shell. 



'. Its cut edge. 



xd. Stomodfeuin. 



*.//. Shell gland. 



*/. Salivary gland. 



si'. Salivary duct. 



si". Aperture of the same. 



*.. Nerves to the same. 



y/>. Spermatheca. 



xt. Stomach. 



t. So-called olfactory tentacle. 



t'. Optic tentacle. 



t.ti. Tentacular artery. 



tph. Intestinal valve. 



v. Subtentacular lobe (modified remnant of 



velum). For Plate XIII., ventricle. 



va. Auriculo-ventricular valves. 



v.c. Blood sinus of visceral sac. 



v.c.p. Circulus venosus pulmonis. 



v.d. Vas deferens. 



vi/. Vagina. 



v.n. Visceral nerve, 



r.s. Visceral sac. 



.'. Its cut edge. 



