56 



ATLAS OF BIOLOGY 



pr. Prostate. 



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



p.v. Afferent pulmonary vessels. 



p.v'. Efferent pulmonary vessels. 



r. Rectum. 



r'. Cut edge of the same. 



;>/. Radula. 



rd'. Sac of the radula. 



re. Renal organ. 



re*. Renal duct. 



re". Renal aperture. 



r.m. Columellar (retractor) muscles. 



r.m '. Retractor pedis muscle. 



r.m". Retractor muscle of buccal mass. 



r./>. Retractor muscle of penis. 



r.t. Retractor muscle of tentacle. 



r.t). Afferent renal vessels. 



r.w'. Efferent renal vessels. 



s. Shell. 



'. Its cut edge. 



sd. Stomodasum. 



s.i/. Shell gland. 



xl. Salivary gland. 



*/'. Salivary duct. 



si". Aperture of the same. 



s. n. Nerves to the same. 



s/i. Spormatheca. 



st. Stomach. 



t. So-called olfactory tentacle. 



t'. Optic tentacle. 



t.a. Tentacular artery. 



t/ilt. Intestinal valve. 



v. Subteutacular lobe (modified remnant of 



velum). For Plate XIII., ventricle. 



fa. Auriculo-ventricular valves, 



r.c. Blood sinus of visceral sac. 



r.c.p. Circulus venosus puhnouis. 



v.d. Vas deferens. 



vy. Vagina. 



v.n. Visceral nerve, 



c.s. Visceral sac. 



.*'. Its cut edge. 



