50 F 
EKWAN RIVER 
Euomphahis, sp. indet. 
Ekwan river, lower rapid : a cast of the interior of part of tlie 
outer whorl of a larf;e species. 
GyroriHjna speciosn m , sp. nov. 
Shell (piito large for the genus, imperforate, turhinate, a little higher 
or longer than wide, .spire slightly higher than the outer whorl. Whorls 
six or se\en, rounded, ventrioo.se ; aperture wididy sidjovate, not far 
fioni circular, lip thin and simple. 
Surface marked wil.h numerous and rather close-.set small .sjiiral 
ridge.s, (hat are cro.s.sed h\ .still more nunioruu.s, inuic. clo.-<o. sot and 
minute, transverse rai.sed lines. On the last whorl but one there are 
about eight of these s[iir;d ridges, and on the last or outer one there 
are not less than twelve and juobalily as many as fifteen. 
Itkwan river, ])oitago road at falls: two specimen.s. The larger 
of these was probably about forty-live millimeti-es high or long, when 
perfect, and its maximum width is thirty-live mm. 
Gyrovema DotrUnyii^ sp. nov. 
Shell turbinate, bigher or longer than wide, .spire elev/ited, volutions 
rounded and ventricose ; umbilicus almost or ijuile clo.sed. Lower whorls 
of the spire marked with three rather di.stant, acute and prominent 
spiral keeks. Outer whorl encircled by four comparatively large spiral 
keels ;ind by a few much smaller spiral ridge.s, or minute raised lines. 
Between tlu' secuiul arul third spiral keels there, are three clo.se-set, 
low and rounded, minute .spiral raisetl lines', and there are indication.s 
of a few small spiral ridges in the umbilical region, below the lowest 
of the four large spiral keels, 
Ekwan river, portage road at falls: ono imperfect specimen with 
the apical whorls broktm ofT, but with the test preserved on the last 
two whorls of the spire, and on ]>art of the outer whorl. 
A rather smaller species than the preceding and witli very difierent 
sculpture. It is somewhat similar in shape (.o the Cychmr.ma su/cafuin 
of Hall, from the (Juelph formation »jf Ontario (which is probably a 
Gyroneina rather tlinn a /'olytrnpis). But the whorls of L'. I)o/vfivyii 
are not shouldered above, its suture is not channeled, and its outer 
volution is encircled by onlv four large spir.al keads. (r. Dau^llvgii i.s 
still more closely allied to, but appai-ently (juite distinct from the C. 
carinifermn of Sowerby, as figured by Lindstrom in his monograph of 
