Siphuncle of Canadian Endoceratidae — Whiteaves 29 
the internal cast of the siphuncle of an Orihoceras. The 
former would seem to ally the deposit with the Calciferous 
formation, but a single fossil is too slight an evidence to fix 
its age." 
Specimens of this fossil had been collected by Sir W. E. 
Logan at Kingston Mills in 1842, and although these can no 
longer be found, there is little doubt but that they are pieces 
of the siphuncle of N, kingstonensis . 
The similar specimens recently collected at this locality 
by Dr. Ells, Mr. Johnston, and the writer, were found asso- 
ciated with (i) a slender and apparently undescribed species 
of Actinoceras or Paractinoceras, and (2) a small Raphis- 
toma. The Actinoceras seems to have had a smooth test, 
and a beaded siphuncle, detached and worn segments of 
which are abundant as little, slightly depressed spheroids. 
Only one specimen of the Raphistoina was found, and it is 
too imperfect to be determined specifically, but the genus is 
not known to occur in rocks as old as the Calciferous. These 
fossils would seem to indicate that the limestone at Kings- 
ion Mills is probably not older than the Chazy formation, 
noi much if at all newer than the Black River limestone. 
The siphuncles from lake Nipissing and Paquettes rapids 
that were formerly referred to Nanno auletna, can scarcely 
be distinguished at present from those of N. kingstonensis, 
and if they should prove to be specifically identical therewith, 
-the limestone at Kingston Mills may be found to be only a 
local phase or modification of the Black River limestone, or 
of part of the Birdseye and Black River formation. On the 
other hand, it must not be forgotten that the surface mark- 
ings of the prolonged portion of the siphuncle are not at all 
well preserved in the specimens from lake Nipissing, and 
that it is only the apical end of the siphuncle that is to be 
seen in those from Paquettes rapids. 
Ottawa, October 15, 1901^. 
