Siphuncle of Canadian Endoceratidae—Whiteaves. 27 
Calciferous formation at Lot 18, Con. 6, Marlborough, 
Ont., W. R. Billings, 1898: a silicified fragment of the pos- 
terior end of the siphuncle, about an inch and a quarter in 
length, with the apex broken off, but clearly showing the 
swelling and subsequent contraction on the inner or convex 
side. The interior of this fragment is not very well pre- 
served, as the specimen has been treated with acid, which 
may have destroyed some of the more minute details of 
sculpture. The expanded portion of the praeseptal cone 
seems to have been composed of two thin outer layers of 
test, that are amalgamated or fused together, as it were, on 
the convex inner side, and that enclose a rather large inter- 
nal cavity. The interior of th« subsequent and contracted 
portion is nearly filled with a lining of minute quartz crystals. 
This fragment seems to be the first Nanno-like siphun- 
cle that has been found in the Calciferous formation, but it 
is with some hesitation that it is referred to the genus JVan- 
no. 
NANNO KINGSTONENSIS, sp. nov. 
PLATE III— All of the figures. 
Siphunck longicone, moderately elongated and often 
quite slender; tumid and gibbous, or only slightly swollen 
near the apex and afterward rather abruptly contracted on 
the convex inner side, but ultimately increasing very grad- 
ually and equally on both sides. Transverse section usually 
subelliptical or semielliptical in outline, with the lateral 
diameter a little greater than the dorso-ventral ; or not far 
from circular, but always with the peripheral region more or 
less flattened. 
Posterior and expanded portion of the apical cone 
smooth ; the contracted portion thereof and the whole of 
the siphuncle in advance of the apical cone marked with 
numerous, rather closely disposed, continuous and obliquely 
transverse annulations or "septal rings." These annulations 
are rather wide, flat bands, varying in width from two or 
three millimetres in small specimens to four or five in large 
ones, with faint narrow depressions or grooves between 
