Dr Johnston’s Contributions to the British Fauna. 
4. TUBULARIA. 
Cl. POLYPI. — Ord. P. vaginati. 
1. Tub. tubifera. Stem unbranched, projecting from its side§ 
trumpet-like cells. PI. III. Figs. 2. and 3. 
Hab. Sea-coast near Berwick. On a small species of the genus Mata , 
Lamarck, 
Desc. Stem scarcely half an inch in height, round, horny, tubular, in- 
distinctly jointed, unbranched. The cells arise from all sides of the stem in 
an irregular manner, and appear to the naked eye like little branches. They 
are narrow at their origin, long, tubular, with round, even, patulous apertures. 
Obs. Of the seven species described by Lamouroux, there appears to be 
no one which can be confounded with this. 
5. DISCOPORA , Lamarck. 
1. D. trispinosa. A suborbicular expansion, with cells radi- 
ating from the centre ; cells closed by a membrane, and armed 
on the lower margin of the aperture with three long spines. 
Hab. On the Lithodes spinosa , Coast near Berwick, 
Des. A thin, calcareous, suborbicular layer, three quarters of an inch in 
diameter, affixed by its whole basis, but when dry easily removable, of a white 
silvery colour, with minute yellow dots. Cells in rows radiating from the 
centre, small, horizontal, with a raised round aperture, which is closed by a 
brown membrane, whence the dotted surface it presents to the naked eye. 
The cells are divided on the upper side, and on the lower armed with three 
long stout conical spines. 
Obs. This, in the arrangement of Lamouroux, is either a Flustra or a 
Cellepora , but in neither of these genera do I find any species liable to be mis- 
taken for it. 
Art. III . — On the Sodalite of Vesuvius. By W. Haidinger, 
Esq. F. R. S. E. & M. W. S. 
The interesting and novel varieties of tbe Sodalite of Vesu- 
vius, which I am now to describe, are preserved in the Royal 
Museum of the University of Edinburgh. They were pointed 
out to my attention by Professor Jameson, who had arranged 
them with Haiiyne, which substance appears to belong to the 
same species. 
The crystals are distributed in drusy cavities of limestone, 
and associated with grey felspar, pale-green mica, calcareous 
