Dentition of Pulmonate Mollusks. 99 
Leptachatina grana, Newc. W. Maui. 
Dentition as in last species. 
Leptachatina dimidiata, Pir. Oahu. 
Same dentition. 
Lentachatina textilis, Fer. 
The dentition is as in the other species of the subgenus examined by me. 
There are 26-1-26 teeth, with eight laterals on each side. On Pl. VI, fig. G, 
I figure the whole change from central to extreme marginal teeth. The last 
are not pectinate. 
Tornatellina. 
Considered by von Martens as a sub-genus of Cronella, but by 
its dentition closely related to Achatinella, s.s. he Jaw was 
not examined. 
Tornatellina aperta, Pease. Huahine Island. Mr. A. Garrett. 
Lingual membrane (PI. HI, fig. F). The figure represents the central, 
with the first and second side teeth. There is an exceedingly large number 
of teeth beyond this, of the same type, quite to the exterior margin of the 
membrane, The teeth are arranged obliquely in waving rows, as is also 
the case in Achatinella, s. s. Teeth of same type as those of Achatinella, s. s. 
Tornatellina oblonga, Pease. Huahine Island. Mr. A. Garrett. 
Lingual dentition the same as in the preceding species. 
Clausilia. 
The West Indian species alone examined. 
Olausilia tridens, Chemn. Porto Rico. Mr. Robert Swift. 
Jaw (Pl. XV, fig. J) slightly arcuate, smooth, wide, low; ends slightly 
attenuated, blunt; cutting edge with a blunt, wide, median projection. In 
the jaw figured, the lower margin is developed, but much thinner, beyond 
the cutting edge. 
Lingual membrane (Pl. VII, fig. H) short and broad, with about 30-1-30 
teeth. Centrals with long, narrow base of attachment, incurved at the 
sides and base, where it is also excavated or thinned, rounded at top, and 
reflected; reflection small, with one large cusp bearing a short, blunt, cut 
ting point, and sub-obsolete side cusps; laterals like centrals, but asymmetri- 
cal, the base of attachment much wider, the reflection and cusp with its cut- 
ting point much stouter and longer; outer laterals with distinct side cusp 
and cutting point; the base of attachment of the laterals is squarely cut 
away on its inner angle; about the eleventh tooth the teeth begin to change 
to marginals; the extremes of which last are subquadrate, wider than high, 
broadly reflected into a large cusp bearing two oblique, large, irregularly 
bifid cutting points. 
