DOWLING 
SILURIAN FOSSILS. 
51 F 
tlie Silurian ( lastropoda and Pteropoda of (Jotlaad, wliich Ulricli says 
i.s a (lyronema. 
(hjronema brei'ispira, sp. nov. 
Shell rather small, turbinate conical and wider than high ; spii’e 
shorter than the outer volution. Whorls four or live, those of the 
spire oliliipu'ly i:ompre.ssed ; last whorl of the spire angulaled and 
carinat.ed below, next to the .suture ; outer whorl oblii|uely couipressed 
above, rounded and almost imperforate below, the umbilicus being 
represcnti'd by a minute, short and vei-y narrow chink liehind the 
columellar liji : aperture ovately subcii'cular ; lip thin and siiuph?. 
Surface encirch'd by small narrow and acute spiral keels. On the 
last whorl but one there are live of the.se keeks, and on the outer whorl 
eleven. 
Kkwan river, portage road at falls : two .specimens. 
Loxnnema, sp. indet. 
I'ikwan river, at the following localities. Ibiot of portage road, a 
specimen of a small slender s[H'cies, wit.h six whorls pre.servcd ; and, 
upper rapid, a much more imperfect but otherwise similar specimen. 
Portage road at falls, a fragiiK'iit of a larger slu'll, with apparently 
similar ch.iracters, Imt with only two of the whorls preserved. 
Orthnnyclua nfifiis/i, sp. nov. 
Shell straight, conical, slightly compre.ssed at the sides, but more so 
on the right than on tlio left side, and moderately elevated, the height 
being less than the ma.ximum length at tho aperture or ba.se. Apex 
erect, bluntly pointed and rather eccentric : base with two faint, 
ob.scure, .shallow undulations on tlu> right, side, .\perture and outline 
of transverse section at and near the ba.se, subovate but somewhat 
irregular in outline ; lip shallowl}' undulateil on the right .side. 
Surface marlcing.s unknown, though casts of the interior are quite 
smooth, and the e.xterior of large jiieces of the thin and presumably 
inner layer of the test, that hajipen to lie pre.servcd, is marked with 
numerous, irregular and often not continuous, line concentric striie. 
Muscular impressions unknown. 
Pkwan livin', foot of jiortage roail : two specimens, that arc very 
difl’erent in shape to any species of Orthonychia or Platyceras that the 
writer is acquainted wdth. 
