DOWLING. 
SIIA'IUAX FOSSILS. 
I'J F 
grown specimen.s moderately elevated and bounded on each side 
of its .summit by a spiral raised line, but this minute doulde keel becomes 
obsolete on the outer half of tlio last volution, in adult shells. Outline 
of tran.svor.se section near the aperture subreniform and much wider 
chan high in some specimens but somewhat triangular and nearly or 
(juite as high as wide in others; outer lip not pre.served in any of 
the specimens collected, but apparently not abruptly e.vpanded ; apert- 
ural slit unkno’wn. 
Surface of most of the specimens collected marked only witli curved, 
transverse stria* of growth, but in one specimen the markings consist 
of small narrow, thin transver.se ridge.s, with Hat spaces between them. 
Kkwan river, portage road at falls ; seven specimen.s, all of which 
arc imperfect at the ajicrturo. The lai-gest is seventy two millimetres 
in its maximum diameter. 
The generic name Meijaltmtjih >la, Ulrich, IS'JT, is, however, U>o 
close to Hrusina, 1871. 
Sal iniKjo.stonin boreah, sp. nov. 
%Sholl small, consisting nf three rounded volutions that are a little 
wider than high find coiled on the same plane, in close contact, with 
little or no overlap, or at least clo.sely contiguous if not actually in 
contact ; umbilicus wifle and open, exposing mo.st of the inner whorls. 
Aperture trumpet .shaped, li{i widely ami abruptly expanded. 
Surface marked with minute rounded .sjural ribs, that are cro.s.sed 
by small, crenate, lainollo.se rai.sed ridges. The .slit-band is not well 
shown in either of the few specimens collected, but it seems to be 
narrow, and continuoius, at least at some distance behind the aperture. 
10k wan river : middle rajiid, foot of portage road, and portage 
road at falls ; one specimen from each of tliose localities. The largest 
of tlie.se. s]»ecimens, though only twenty three millimetres, or less than 
an inch, in its ma.ximiiin iliameter, has an abruptly expanded aper ture. 
The other two arc obviously immature shells, each about clovc'n mm. 
in its greatest diameter. In one of them the posterior half of the 
earliest volution is free from, and not (juite in contact with, that 
which immediately succeeds it. 
It is only in the continuity of the slit-hand that this .sjiecics and 
shells of this genus are sii{){)o.sed to difVer from Trcnianolus, or as J)r 
Paul Fischer spells it, Tmnnfnnolus. 
4 
