Siphuncle of Canadian Endoceratidae — Whiteaves.\ 23 
NOTES ON THE APICAL END OF THE SIPHUNCLE IN SOME 
CANADIAN ENDOCERATIDAE, WITH DESCRIP- 
TIONS OF TWO SUPPOSED NEW SPECIES 
OF NANNO. 
By J. F. Whiteaves, Ottawa, Ont. 
PLATES II AND III. 
In 1870 Barrande described and figured an obliquely 
annulated, cigar-shaped fossil from Phillipsburgh, which he 
thought was the initial part of the shell of an Endoceras, 
under the name Orthoceras {Endoceras) marcotii, and in 
1874 he redescribed and refigured the same specimen, and 
called it Endoceras marcotii. According to Foord,* "the 
figures of this fossil give one the impression that it is a por- 
tion of the siphuncle, because it is marked by a series of 
oblique rings, which are acutely bent upward on one side." 
* * * "The dark space represented in the cross section," 
he adds, "I should judge to be one of the sheaths which 
occupy the cavity of the siphuncle in this genus." The 
figures show that the specimen is annulated to the very tip, 
and if it is the apical end of a siphuncle, as it certainly seems 
to be, it must have been entirely internal. It looks like the 
cast of the interior of part of the siphuncle of a Fiioceras, 
and should probably be called Fiioceras marcoui. 
However this may be, in the museum of the geological 
survey of Canada there are several siphuncles, or portions 
of siphuncles, of Endoceratidae, with the apical end pre- 
served, from the Black River limestone at one of the islands 
in lake Nipissing, collected by Mr. A. Murray in 1854, and 
a few from the same formation at Paquettes rapids, on the 
Ottawa river, collected many years ago by Sir W. E. Logan 
or E. BilHngs. The swollen apical end of the siphuncle fn 
these specimens is so much like that part of the sipho in 
Nanno aulema, that they were referred to that species, by 
the writer, in the "Ottawa Naturalist" for September, 1898. 
The recent acquisition of a series of similar but much more 
perfect siphuncles from Kingston Mills, has, however, shown 
* Catalogue of the Fossil Cephalopoda in the British Museum, Part 
I (1888), page 132. 
