Lingual Dentition of Achatinella, etc. 351 



EXPLANATION OF TLATE XV. 



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

 the lingual membrane. 



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

 adjacent lateral teeth. 



Fig. 3. JSTanina Chamissoi,Vh'. (Seep. 338.) One cen- 

 tral, one lateral and one extreme maririnal. 



Kig. 4. Achatinella producta, Ev. The genital system 

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

 of same. (/, The genital bladder. 



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



Fig. 6. Newcombia picta, Mighels. Jaw. 



Fig. 7. Laminella 3Iastersi, Newc. Jaw. 



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



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



Fig. 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 tig. 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, artiticially 

 separated. 



Fig. 4. One separate tooth in profile. 



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

 they occur naturally on the lingual membrane, magnitied less 

 than in figs. 3 and 4. 



[Printed at tlie Salem Press.] 



