194 
I have made a few observations on several of them, which 
' may perhaps be interesting. 
I find Orbulina universa common in the Dogs Bay sand ; 
that is, I have picked out some hundreds of specimens. 
They vary greatly in size, the largest being four or five 
times the diameter of the smallest. They have the surface 
frosted with larger and smaller tubercles, arranged with a 
certain kind of regularity, but, though thus rough externally, 
the texture of the shell does not appear to be arenaceous as 
stated by Professor Williamson,— at least, if by that term is 
meant that it is formed of agglutinated grains of sand as is 
the case with some other species. When examined with a 
high power and transmitted light, the larger and smaller 
tubercles show black from their density and the spaces 
between them are partly occupied by objects like very trans- 
parent thin plates, of a uniform size and an imperfectly 
squared figure, the impression these convey being that they 
have been produced by a kind of crystallization of the 
material of the shell at the time of its original formation. 
I conclude that the colourless condition of my specimens 
depends on the perfect manner in which all animal matter 
has disappeared, and I think for an examination of the mere 
structure of the outer case this must be an advantage. It 
may be interesting to note that among the specimens are a 
few with one or more protuberances of parts of their surface, 
destroying the regular spherical figure, and indicating an in- 
cipient budding before the shell hardened ; there is also one 
large and very handsome double specimen. 
Besides the Orbulinas I have an example of another kind 
of spherical object, which for convenience I will mention here, * 
Ihough I do not suppose it to belong to the Foraminifera at 
all. It looks like a sphere of the most transparent glass, and 
is without colour or markings of any kind. 
I have found all the forms of Lagena, excepting L. vulgaris 
typica and L. gracilis. Lagena striata and interrupta are 
