Achatinella and other Pulmonata. 351 



EXPLANATION OF PLATE XV. 



Fig. 1. Zonites Gimdlachi, Pfr. One marginal tooth of 

 the lingual membrane. 



Fig. 2. Achatinella jproducta, Rve. One central and 

 adjacent lateral teeth. 



Fig. 3. Nanina Chamissoi, Pfr. (See p. 338.) One cen- 

 tral, one lateral and one extreme marginal. 



Fig. 4. Achatinella producta, Rv. The genital system 

 enlarged, a, see p. 337. 6, Vaginal prostate? c, Flagelluni 

 of same. cZ, The genital bladder. 



Fig. 5. Same as c of fig. 4, as it lies in the animal. 



Fig. 6. Kewcomhia picta^ Mighels. Jaw. 



Fig. 7. Laminella Mastersi, Newc. Jaw. 



Fig. 8. Leptachatina nitida, Newc. Marginal teeth. 



Fig. 9. Laminella Mastersi, Newc. Marginal teeth. 



Fis;. 10. Same. One central and one lateral, still more 

 enlarged. 



Fig. 11. Same. A group of central and lateral teeth. 

 Same scale of enlargement as fig. 9. 



Plate xvi. 



Fig. 1. Helix picta, Born. Jaw. 



Fig. 2. The same, lingual membrane, a, central tooth. 



Fig. 3. Onchidium (see p. 340). The central and ad- 

 jacent lateral teeth of the lingual membrane, artificially 

 separated. 



Fig. 4. One separate tooth in profile. 



Fig. 5. The same, a group of centrals and laterals as 

 they occur naturally on the lingual membrane, magnified less 

 than in fisfs. 3 and 4. 



