98 Dentition of Pulmonale Mollusks. 



The lingual dentition in this section is entirely different from 

 that in the last. The membrane is long and narrow. The trans- 

 verse rows of teeth are horizontal, not en chevron. The teeth 

 are like those usually found in the Pulmonata, with quadrate 

 base of attachment and tricuspid centrals, bicuspid laterals, bi- 

 cuspid, multicuspid, or even pectinate marginals. The centrals 

 are verv much smaller, than the laterals, both in height and 

 width. 



Newcombia picta, Mighels. W. Maui. 



Jaw described above. Lingual membrane, PL VI, fig. B. The margin- 

 als have two cutting points, each point becoming bifid as the teeth pass off 

 laterally. 



Neivcombia venusta, Mighels. 



Jaw slightly arcuate, with blunt ends ; a few vertical wrinkles. 



Lingual membrane (PL VI, fig. A.) shown in all its changes. The mar- 

 ginals are decidedly pectinate in the teeth figured, but some are seen with 

 only two cutting points. Teeth 24-1-24, eight being laterals on each side of 

 the median line. 



Laminella Mastersi, Newc. West and East Maui. 



Jaw described above. (PL XVI, fig. E.) 



Lingual membrane (PL VI, fig. E) with simply two or three cutting points 

 to the marginals. A group of these latter, and of centrals and laterals, is 

 given. 



Laminella obesa, Newc. 



Lingual membrane (PL VI, fig. C) with 27-1-27 teeth, of same type as in 

 the last species. 



The tooth shown in the figure is the 19th, a marginal, with one large, 

 inner cutting point, and three very small outer ones. On the same mem- 

 brane, however, are some marginals having three cutting points and some 

 which are quite pectinate. This variation shows that my distinction be- 

 tween b and c, in my former paper, referred to above, was not well founded, 



The jaw is as in A. Mastersi. 



Laminella decorticata, Gulick. Oahu. 

 Lingual membrane (PL VI, fig. D) as in Mastersi. 



Laminella luctuosa, Pfr. Oahu. 

 Lingual membrane (PL VI, fig. F) as in Mastersi. 



Laminella nigrolabris, Smith. Oahu. 

 Lingual membrane as in Mastersi. 



Leptachatina nitida, Newc. W. Maui. 

 Lingual membrane (PL VI, fig. H), marginals pectinate. 



