121 
other forms allied to Scalites, are essentially Primordial and Lower Silurian. The two or three 
specimens that I have seen are simply casts, with mere fragments of the actual shell adhering 
to them, and it must at present remain doubtful to what generic group they really belong. 
Locality and Formation.—Corniferous Limestone, Port Colborne. 
CHAPTER VI. 
ANNELIDA AND ORUSTACEA OF THE CORNIFEROUS AND HAMILTON FORMATIONS. 
ANNELIDA. 
The remains of Annelides, though far from uncommon in the Devonian Rocks of On- 
tario, are entirely referable, so far as I have seen, to the genera Spirorbis and Ortonia, though 
there are indications of the existence of genuine Serpulw or Vermilie. Of the two species of 
Spirorbis which have come under my notice, one is the S. omphalodes of Goldfuss, a form 
which occurs in the Devonian of Europe, whilst the other I cannot identify at present with 
any recorded form, The genus Ortonia is apparently represented by one species, which 
appears to be new. 
Genus SprrorBis (Daudin), 
Tube calcareous, solitary, coiled into a flat spiral, which may be dextral or sinistral, 
and which is attached by one flat surface to some foreign object. The genus appears to have 
commenced its existence in the Silurian period, and is well represented by living species in 
existing seas. 
150, SPIRORBIS OMPHALODES (Goldfuss). 
Serpula omphalodes (Goldfuss), Petref. Germ. Pl. LXVIT., Fig. 3. 
Tube dextral, of two and a half turns, the outer side of each turn being somewhat flat- 
tened, and the upper edge obtusely angulated or gently rounded. Diameter, when adult, 
about a line and a quarter, height about one-third of a line, the diameter of the slightly up- 
‘turned mouth nearly half a line. The last turn of the tube is much the largest, and a well- 
marked umbilicus is present, though the turns are contiguous. Surface smooth, and without 
ridges or tubercles of any kind. 
. There can be no hesitation in identifying this spe- 
fg) cies with the European form, with which it agrees in 
its form, size, and proportions, and in the characters of 
the surface. It occurs in the Corniferous Limestone in * 
the form of casts of the tube, adhering to the corallites 
of Diphyllum arundinaceum ; and it is common in the 
Fig. 54, Hamilton group, growing upon Heliophyllum Hall, Cys- 
a Spirorbis omphalodes (Goldtuss), naturat “Phylum vesiculosum, C. Americanum, and oceasionally 
size and enlarged 3b Spirorbis Arkonensis (Nich) Spirif era nvucronata. 
sale Bsc, culnecd Ro ee Locality aad Formation.—Corniferous Limestone, 
ton Formation. Lot 6, Con. 1, Wainfleet. Hamilton Formation, Bart- 
lett’s Mills, Arkona, Township of Bosanquet, and Widder. 
151. Sprrorpis ARrKoNENSIS (Nicholson). 
Tube minute, sinistral or dextral, of two turns, rounded, and somewhat globular owing 
to the elevation and large size of the last turn. Aperture circular, usually turned upwards. 
Diameter of the entire spiral about a third of a line, never exceeding half a line. Surface 
marked with numerous very closely-set thread-like transverse annulations or ridges, which are 
not separated by more than their own width. A minute umbilicus is present. 
