342 



PROFESSOR. BAY LANKESTER AND A. G. BOURNE. 



to enable us to say whether the epithelium of these papillae is 

 specially modified or not. 



(f.n . 



I'iscper. 



Fig. 1, — View of the postcro- ventral surface of the body of a female 

 Nautilus pompilius, as seen when the mantle-skirt is reflected. 

 Drawn from the object by Mr. A. G. Bourne, and reduced to one half 

 the natural diameter, a. Muscular band from the foot (siphon) to the 

 body-wall. b. Valvular ridge of the siphon, c. The reflected border of 

 the mantle-skirt, an. Anus. .r. Peculiar median group of post-aual 

 papillae of unknown significance, ff. n. Nidamcntal gland, r. ov. Wight 

 oviduct's ajjcrture. /. ov. Left oviduct's aperture, ncph. a. Aperture of 

 the, left anterior nephridial sac (in front of tiie left anterior gill-plume). 

 ncph. p. Aperture of the left posterior nephridial sac (in front of the left 

 posterior gill-plume), vise. per. Left aperture of the viscero- pericardial 

 sac. olf. The left osphradiiim (Spengel's olfactory organ). 



With regard to the second test we obtained very satisfactory 

 evidence. The basi-branchial papillno of Nautilus possess pre- 

 cisely that nerve-supply which is characteristic of tlie moUuscan 



