There are three examples of this coral, of which two show spiniform septa in the corallites. The smaller of the two specimens, in which septa are seen, is preserved with a small corallum of Acervularia austini in the same piece of limestone.
The horizon indicated by the first and last of the above three species of corals from Beechey island would be about that of the Niagara formation.
SOUTHAMPTON ISLAND, HUDSON BAY.
Streptelasma robustum, Whiteaves.
This large and well marked species, described originally from the Galena-Trenton of the Lake Winnipeg region, is represented by a number of more or less fragmentary specimens. The inner structure is well shown in transverse and longitudinal sections.
Favosites gothlandica, Lamarck.
Over forty specimens from this locality are referable to this well known species. In many of them are seen the spiniform septa, characteristic of all Silurian favosites, and distinguishing them from all Devonian forms which apparently without exception possess linguiform septa. It is possible that more than one species may be here represented. The range in size of the corallites in F. gothlandica has been noticed by the writer in his ‘Revision of the genera and species of Canadian Palæozoic corals[*],’ 1899-1900, but in the present collection the fragmentary condition of most of the specimens does not admit of characters dependent on the outward form of the corallum being used with any degree of certainty.
| [*] | In this report the reader will find extended references to the structure of the majority of the species mentioned in these notes. |