THE HAMILTON ASSOCIATION. ITT 
AULOCOPINA—BILLINGS, 1815. 
Canadian Naturalist, NV. Series, Vol. 7, Page 230. 
Mr. Billings describes the genus in an article on some little 
known fossils from the Silurian and Devonian rocks as follows : 
“Generic characters: The larger or upper extremity is more or 
less concave with a small circular space in the centre, which appears 
to be the mouth of a tubular cavity that penetrates inwards and 
downwards, along the vertical axis of the sponge. I shall call 
it the osculum. From its edges numerous small irregular (some- 
times branching) ridges radiate outwards in all directions from the 
‘surface and descend the sides of the base. Several polished sections 
through the osculum downward show that the centre at least in 
the upper half was occupied by a large tubular cone with smaller 
ones branching from the sides outwards and downwards. This 
structure is only indicated by the dark-colored material which fills 
the canals, in contrast with the light grey chert which constitutes the 
mass of the fossil. The genus somewhat resembles Aulocopinum in 
its structure, and differs in having its whole surface covered with 
rounded irregular ridges above mentioned.” 
AULOCOPINA—-GRANTI. 
‘y. One of the specimens is sixteen lines in length and twelve in 
width about the middle. The osculum is a little over two lines 
in width. There are in general from five to nine striz or ridges on 
the surface, in the width of three lines. These radiate from the 
osculum and sometimes down to the base so that its surface is 
covered with them. 
2. Specimen somewhat compressed. 
3. Summit of a large individual. 
4. Fragmentary specimen, two inches in diameter, occurs at 
Hamilton, Ontario. The most perfect is of an elongate oval or 
pyriform shape. I propose to call it Aulocopina and dedicate 
the only species known to me to Major C. C. Grant.” 
FROM DR. HEAD’S NOTES. 
Mr. Billings made no reference to the microscopic structure of 
the genus, although he knew that subject was becoming of prime 
importance in the study of the organism at the time he described it. 
