III.—On the Detection of Mural Pores in thin Sections of the Favositidæ

^{page 105 note 1} By “the genus Chæceates hyperbolas” Mr. Thomson refers, I presume, “species” described by MrEtheridge, E., jun., and myself, under the name of Chætetes hyperboreus.

^{page 105 note 2} Mr. Thomson's disbelief in the possibility of recognising mural pores in thin sections of the Favositoid Corals is, it may be noted, of comparatively recent growth. Thus, in a paper published in the Proceedings of the Philosophical Society of Glasgow in 1881, Mr.Thomson, described and figured what he believed to be mural pores in thin sections of Chætetes Etheridgii, Thoms, sp. A reference to his figure (loc. cit. pi. i. fig. 7) will show, however, that in this case the supposed “mural pores” are represented in the centre of the calcite filling the visceral chambers of the corallites, and that they are really nothing more than minute granules of calcite.