Maltwood, on a Finder. 
59 
out this septal process. The terminal edge of the chamber in 
Sphseroidina is incurved in some degree ; and in Vertebralina 
it is elegantly recurved. Both these conditions occur in 
Miliola; whilst in some varieties the margins are quite 
even. 
Miliola occurs as low down in the strata as ti e Lias : it is 
rather abundant in the clay of that period from Stockton^ in 
Warwickshire. Here^ however, it is very small and delicate ; 
a condition precisely similar to what is seen in dredgings of 
recent forms from 350 to 500 fathoms. It is small also in 
the Gault ; but constantly present in that deposit, as well as 
in the Chalk-marl. From the Upper Chalk to the present 
period it is everywhere abundant. This species, like many 
other Foraminifera, is world-wide in its present distribution, 
and is most abundant from the shore to 150 fathoms. I 
have also found it in soundings obtained by Captain Spratt, 
R.N., between Malta and Crete, at 1620 fathoms. 
I must not omit to say, that I owe to Dr. Carpenter the 
idea that these innumerable forms are not true species ; and 
that my friend Mr. T. Rupert Jones has for a long while 
rendered me his invaluable assistance and oversight. 
On a Finder for registering the Position of Microscopic 
Objects. By T. Maltwood, Esq. 
(Read January 13tli, 1858.) 
One of the earliest wants I felt after beginning to use the 
microscope was that of an object-finder, and from the first 
of directing my attention to the subject it has appeared 
to me that a finder, to be efficient and of general utility, 
should possess the following properties : 
1st. It should be adapted for use with microscopes, either 
with or without movement- stage. 
2d. It should admit (without any previous preparation) of 
an object being registered, which has been unexpectedly 
brought into the field. 
3d. It should be used under the microscope by making it 
take the place of the object, and should be capable of being 
made sufficiently correct, that objects registered by one finder 
might be placed in the field by another. 
