Anatomy of the internal organs of a female gasteropod, viewed from the dorsal side. The roof of 
the mantle cavity has been divided by a longitudinal incision and the flaps laid out, that on the left 
bearing the ctenidium and osphradium, and that on the right the rectum and terminal part of the 
oviduct. The muscular dorsal wall of the body and the introvert have been divided so as to bring 
into view the anterior part of the alimentary canal and a portion of the nervous system. The 
buccal cavity has been tilted up and opened so as to show the odontophore, and the esophagus has 
been cut through near the anterior end. A portion of the ventral wall of the crop has been removed 
so as to bring the internal folds into view, and the interior of the nephridium with the contained 
portion of the intestine has been exposed. The stomach is not seen, being hidden by the neph- 
ridium, and the ovary is not represented. an., anus; ant. aort., anterior aorta; aur., auricle; buc., 
buccal cavity ; cer. buc. con., cerebro-buccal connective; cer. g., cerebral ganglia; crop, crop; cten., 
ctenidium ; int., intestine; jaw, jaw; l. bue.g., left buccal ganglion; I. sal. gl., left salivary gland; 
neph., nephridium ; neph. ap., nephridial aperture; od., odontophore; oes., Pp us; oes’., anterior 
end of same, cut and turned aside; osph., osphradium ; ovid., oviduct ; ovid’., terminal thick-walled 
portion of oviduct; pleur. g., pleural ganglion ; post. aort., posterior aorta; post. oes., posterior esoph- 
agus; rad. s., radula sac; r. sal. gl., right salivary gland; rect., rectum; sal, du., salivary duct; siph., 
siphon; supra. g., supr ph 1 visceral glion ; tent., tentacle; vent., ventricle. 
22 337 S 
