85 
MICROSCOPICAL AND NATURAL HISTORY SECTION. 
January 7tli, 1867. 
A. G. Latham, Esq., President of the Section, 
in the Chair. 
The President exhibited mounted specimens of Forami- 
nifera from Dogs Bay, Roundstone, and from Berwick Bay, 
and he remarked on some differences in the character of the 
two deposits. He pointed out that in the Dogs Bay sand 
the prevailing forms are Truncatulina and Miliolina, while 
in the Berwick Bay dredging they are Dentalina and Bilo- 
culina. He also remarked on the great difference in the 
quality of the shell of Truncatulina from these two locali- 
ties, those from Dogs Bay being delicate and hyaline, while 
those from Berwick Bay are opaque and very thick and 
strong. 
The following paper, “ On Polymorphina tubulosa,” was 
read by Dr. Alcock. 
In the course of examinations of the Dogs Bay sand, I 
have collected great numbers of detached branches of Poly- 
morphina tubulosa, a form of foraminifer which is not likely 
ever to be found perfect in shore sand. I have, however, 
met with several fine specimens of it with only the tips of 
the branches broken away; but the most interesting ex- 
amples are some which are more damaged, and show several 
structural features difficult, if not impossible, to be seen in 
perfect specimens. The main body of the shell of Polymor- 
phina tubulosa has the form of Professor Williamson’s P. 
communis, and appears to be identical with it, this form 
only, so far as I have seen, taking on the peculiar final 
