4A List of Minerals and Organic Remains. 87 
part of the fossil; a fact by no means uncommon there ; 
but quite new. 
Astrea.—The A. basaltiformis, (lithostrotron of Germa- 
ny, and of Lloyd,) was presented to me by Major Dela- 
field, and I believe from the limestone of the River De- 
troit. A new and elegant Astrea from Drummond’s Island 
in Lake Huron is engraved in the transactions before refer- 
red to: and also another, very similar to the one repre- 
sented in fig. 3, tab. 47, of Lamoureux, “ Sur les Polypes 
Flexibles,” &c. but the compartments of his are rounder 
and often pentagonal, while those of mine are irregular in 
the number and size of their sides. Vertical sections of. 
this fossil frequently present interesting views of its inode 
of increase. 
Cellular and chain Madrepores, Tubipa strues and ra- 
mosa, retepores, and flustra are in great abundance every 
where. 
Nine varieties of a new genus of madrepores from the 
Manitoulines of Lake Huron have been described in the 
transactions frequently alluded to. They were first sent to 
Quebec, in 1818, by Mr. White the medical officer of the 
British Military station on Drummond’s Island. 
I was immediately struck with their singular form, which is . 
that of a vertebral column, sometimes two feet long: and in 
the following summer I visited the spot. A general search 
for fossils then commenced, which has been attended by 
very gratifying results. Some remarkable facts respecting 
these remains were brought to light in May, 1823: but I 
am not yet prepared for their publication. 
For a description, illustrated by drawings of several oth- 
er new organic remains from Lake Huron, I beg to refer 
to the transactions of the London Geological Society. 
The following shells are known only in the more recent 
formations. The delicate bivalve, the lingula (Crag, 
London Clay.) occurs in considerable numbers among the 
trilobites and orthoceratites of Lake Simcoe; and in well 
marked specimens. ‘They are oval or sub-oval, and rath- 
er longer than half an inch. They are casts which fre- 
quently retain the original shell of a glossy hair brown col- 
our. 
Mr. Say, of Philadelphia, (to whom Iam under many ob- 
ligations,) pronounced with great hesitation, on account of 
