c NE 
Rhodora 
JOURNAL OF 
THE NEW ENGLAND BOTANICAL CLUB 
Vol. 9. August, 1907. No. 104. 
A PARTIAL LIST OF CONNECTICUT DIATOMS WITH 
SOME ACCOUNT OF THEIR DISTRIBUTION IN 
CERTAIN PARTS OF THE STATE. 
WILLIAM A. TERRY. 
CONNECTICUT is rich in diatoms, both in quantity and variety, and 
fossil deposits are abundant, both of fresh water and marine. The 
very ancient deposits like those of Virginia and Maryland cannot be 
expected here, as the great ice sheet during glacial times swept all such 
as may have existed into the sea, but the time since then has been 
sufficient for the accumulation of a vast store of material of which 
very little has ever been investigated. I have found eleven fresh 
water deposits in Bristol, varying in size from a few rods in diameter 
to many acres; one in the northern part of the town, ‘‘No. 11," covers 
fifteen acres and possibly much more. The diatomaceous stratum 
of these deposits is generally three to four feet below the surface, and 
in the larger deposits averages about two feet in depth, but in No. 11 
it is of unknown depth; I have material from ten and a half feet 
below the surface, showing about seven feet of diatoms to this point; 
it is especially interesting as it contains numbers of the beautiful 
Cyclotella antiqua W. Sm., which is very rare in this country; all 
correspondents to whom I have sent it report that they had never 
seen it before. Dr. Ward sent me a slide with this label from Prof. 
H. L. Smith’s collection which is in his possession, but the forms 
shown were not the same. The specimens from which Van Heurck 
made his drawings for his Synopsis must have been very inferior to 
the Bristol specimens in beauty. 
In New Britain Mr. W. R. Stone discovered a fossil deposit in which 
I found a new Stauroneis, the outline of which resembled that of . 
s 
