198 
called chalk. On analysis he had found it to have the 
following composition. 
Lime, 29°57 
Magnesia, 6:17 
Silica, 39°78 
Oxide of Iron, wi) 
Water, “96 
Carbonic acid, 22°77 
100- 
Pror. H. Wurtz made some remarks relative to the for- 
mation of Vivianite and Glauconite in Greensand, and pointed 
to the value of studying the chemical phenomena involved 
in similar points of Geology. 
Pror. A. M. Epwarps alluded to the investigations ot 
Bailey and Ehrenbergh on the Greensand, whereby it had 
been shown that casts of Forameniferous shells, similar to 
those making up the mass of the Greensand, were to be seen 
in the soundings procured from the bottom of the ocean at 
the present time. 
The following paper was read by title. 
Notes on the Genus Pineria and on the Lingual Dentition of 
Pineria Viequensis Pfr. 
By T. BLAND AND W. G. BINNEY. 
The Genus Pineria was established by Poey in 1854, and 
embraced two species from the Isle of Pines; the shells 
allied in form to Macroceramus, but the animal described as 
having no “inferior tentacles.” Subsequently Bulimus 
Viequensis Pfr. and Helix Schramm Fisch. have been referred 
doubtfully to Pineria, with a suggestion that they belong 
rather to Macroceramus. 'The authors treat the latter species 
as synonym of the former, which has, they explain, the 
lingual dentition of Cylindrella, very similar to that of 
C. Trinitaria Pfr. and not of Macroceramus. 
