—E eee 
NATURAL SCIENCES OF PHILADELPHIA. — 233 
almost horizontal. By fig. 11 of pl. XVII., representing V. Flori- 
dana, it will be seen that the teeth are of a very peculiar type. 
The lingual membrane is long and very broad, comprising (in 
the Florida species) about 60—1—60 teeth. The centrals have 
their base of attachment quite small, long and narrow, attenuated 
to a point above, gradually enlarging toward the base, above which 
are lateral, bluntly pointed, wing-like expansions ; the lower mar- 
gin is broad, and has a deep, rounded excavation; in some cases 
the lateral expansions are so produced as to give an aimost cruci- 
form appearance to the base of attachment; below the centre of 
the base of attachment, on its anterior surface, is a stout, blunt, 
short, simple cusp, ending in a short, stout cutting point. 
Fic. 76. 
Lingual dentition of Veronicella Floridana. 
The lateral teeth are very irregular in shape, but retain the bi-. 
cuspid character peculiar to the Geophila; they are longer and 
much wider than the centrals; the bases of attachment are: 
very irregular in shape, very unsymmetrical, subquadrate or ir- 
regularly excavated above, thence curve outwards and downwards, 
until at their lower extremity they exhibit the lateral expansions 
and basal excavation of the central tooth, but both these charac- 
ters are much more developed than in thé centrals, and from the 
want of symmetry in the teeth, are found only on the outer side- 
of each tooth ; the upper edge is squarely reflected, the reflection. 
is very large, extends half way to the lower edge of the base of. 
attachment, and is produced beyond that into a blunt, stout cusp 
bearing a stout cutting point; the side cusps are almost obsolete, , 
the inner one is much larger than the outer one, neither with dis- 
tinct cutting point. The marginal teeth are a simple modification. 
of the laterals, being reduced to a subquadrate shape, with the 
cutting point of the cusp much more produced. 
I give on pl. XVI, fig. 11, a group of centrals and laterals in a, 
a marginal in 6. 
I have not been able to examine V. olivacea, the only other. 
Species found within our limits. 
16 
