Ill 



Os. n. = Osphradial nerve. 



Osp. «7 = Ciliated cell region of 



osphrad. leaflets. 

 Osp. gl. = Gland cell region of 



osphrad. leaflets. 

 Osp. so. = Sensory cell region of 



osphrad. leaflets. 

 Osph. = Osphradium. 

 Ot. = Otocyst. 



ov. — Ovary (oviduct in figs. 38 



and 37). 

 ova. — Eggs. 

 ovd. = Oviduct. 



md."' = Vaginal part of oviduct. 



P. = Penis nerve. 

 Pall. = Mantle. 



Pall. ep. — Mantle epithelium. 

 Pall. gl. = Mantle conn, tissue. 

 pall. n. & w." = Pallial nerves. 

 Ped. g. — Pedal ganglia. 

 Ped. gl. — Pedal gland. 

 ped. gr. = Pedal groove. 

 ped. mus. = Pedal muscles. 

 ped. n. = Pedal nerves. 

 Pen. = Penis. 



Per. p. = Pericardial cavity. 



Ph. = Pharynx. 



Pig. = Pigment. 



pi. I. = Left pleural ganglion. 



pi. p. — Pleuro-pedal connective. 



pi. r. = Right pleural ganglion. 



pr. — Processes of retinal cells. 



prob. = Proboscis. 



prob. m. = Proboscis muscles. 



Ps. cor. = Pseudo cornea. 



Pul. = Larval heart. 



r.' & r." — Retractor muscles 



(dorsal). 

 R. Sin. = Reno-mucous vessel. 

 Red. = Rectum. 

 Ren. = Renal organ. 

 ren. cil. = Ciliated cells of renal 



epithelium. 



ren. eff. = Vessels of renal organ. 

 ren. ep. — Renal epithelium. 

 ren. lam. = Renal lamella. 

 ren. r. = Renal ridges. 

 Ret. c. — Retinal cells. 

 rhyn. = Rhynchodoeum. 

 Rst. — Rhynchostome. 



S. = Stomach. 



8. gl. c. = Salivary gland cells. 

 Sal. d. — Salivary duct. 

 Sal. gl. = Salivary gland. 

 Siph. = Pallial siphon. 

 Siph. n. = Siphon nerves. 

 Sptd. = Spermatid. 

 Spte. = Spermatocyte. 

 Spz. — Spermatozoa. 

 St. = Stomach. 

 St. a. = Stiftchen. 

 sub. int. = Subintestinal ganglion. 

 sup. int. = Supraintestinal ganglion. 

 sup. m. — Supporting structure of 

 ctenidial leaflets. 



Tent. = Tentacle. 



tent. =Tent. nerve (fig. 42). 



tri. lat. — Triangle lateral. 



V. def. = V&s deferens. 

 V. de).' — Coiled part of vas deferens 

 V. def/' — V&s deferens in penis. 

 V. del. c. = Vas deferens canal. 

 V. e. m. = Ventral muscle sheet. 

 V. pr. m. = Ventral protractor 

 muscles. 



V. r. = Retractor muscles (dorsal). 

 v. r. m. — Ventral retractor muscles. 

 vas. d. = Vas deferens. 

 vel. = Velum. 



vis. com. = Visceral commissure. 

 X. con. — Connect, tissue of mantle. 

 Zyg. = Zygoneuric connection. 



