31 
Dimensions. — Diameter, eighteen millimetres ; height, about three 
millimetres. 
Relations and Differences. — This species has a great resemblance to 
R. corndensis, Sowerhy, from which it is clistingnished by its greater size and 
larger number of tuhercnlations. 
Horizon and Localitij . — The unique specimen which has been sent to 
me was found in a fairly compact argillaceous rock of an ochreous tint, 
collected at Dock Flat Creek, on the eastern side of Maneero. 
2. Euomphaltjs ? PLEunoPHonus, L. G. de KonincTe. 
PI. I, fig. 6. 
Shell helicoid in shape, rather globular, composed of four or five spiral 
whorls ; spire depressed to a very obtuse angle ; sutures fairly well marked 
by a shallow furrow ; whorls clasping,- mouth subcircular and relatively 
small in consequence of the comparative thickness of the shell, principally on 
the side of the suture; on the opposite side the test is flattened, and extends 
in a pretty well marked margin around the base of the shell. This part being 
almost entirely enclosed in a very hard siliceous matrix, from which it was 
almost imjjossible to develop it, I have been unable to determine exactly the 
shape of the umbilicus. However, an accidental fracture enables me to say 
that it was not large, and was funnel-shaped. The external surface is rough, 
but it is probable that this roughness is due to fossilisation, as there is no 
regularity about it. 
Dimensions. — Length, twenty-three millimetres ; transverse diameter, 
thirty- five; spiral angle, 148°; height of the last whorl of the spire, twenty 
millimetres ; diameter of the opening of the mouth, six millimetres. 
Relations and Differences. — This sjoecies differs from all known to me 
in the thickness of the test, which almost from its form recalls to one the tube 
of Magilus. I have also some doubts about its generic position, but it has 
been impossible for me to develop the only specimen sent to me sufficiently 
to remove my uncertainty. 
Horizon and Locality. — I have no positive evidence as to the age of 
this species. The quartzose rock which contains it, the characters of which 
are similar to some of the rocks in which were found the majority of the 
