182 Reports and Proceedings— 
axes are parallel to the shorter diagonal of the Nicol’s prism, while 
the greyish and less fibrous areas are darkest in the reverse position. 
The author believes that two distinct minerals are present, as in 
the spherulites of the ordinary granophyric structure; the browner 
rays may be pyroxenic, but the crystalline substances produced 
under these conditions of hurried consolidation may be far different 
from those developed in the more central portions of the mass. 
Spherulites with pleochroic rays are the normal type in basic glasses, 
and some occur even in some acid examples. 
An analysis of the Ardtun spherulitic tachylyte shows it to 
resemble that of Beal in Skye, having 53 per cent. of silica and 
nearly 6 per cent. of alkalies. 
An occurrence of tachylyte at Kilmelfort, Argyll, was noted, and 
a description given of an example of great beauty from the Quiraing 
in Skye. The latter rock shows, in section, a light-brown trans- 
lucent glass, with abundant cumulites and small brown spherulites 
with radial structures. 
Near Bryansford, County Down, in Ireland, a basalt dyke occurs, 
the selvage of which must must have originally resembled tachylyte 
of the Quiraing. The alteration that this glass has undergone guides 
one in the search for tachylytes (palagonite and so forth) among the 
Paleeozoic rocks of the British Isles, and an instance was described 
from Snead, near Bishop’s Castle, where fragments of basic glass 
are imbedded in a tuff of Ordovician age. 
In conclusion, the well-known variolite of the Durance was cited 
as a rock of basic character, comparable, in its perlitic and spheru- 
litic structures, with the acid ‘“ pyromerides,” both types having 
alike suffered from secondary devitrification. 
4. “Appendix to Mr. A. T. Metcalfe’s paper ‘On Further Dis- 
coveries of Vertebrate Remains in the Triassic Strata of the South 
Coast of Devonshire, between Budleigh Salterton and Sidmouth.’ ” 
By H. J. Carter, Esq., F.R.S. Communicated by A. T. Metcalfe, 
Esq., F.G.S. 
A microscopic examination of certain calcareous pellet-like bodies, 
containing plates possessing a bony strueture, and referred to in 
Mr. Metealfe’s paper in the Society’s Journal for May, 1884, revealed 
the fact that the plates resembled the scales of the Bony Pike, and 
also the scales contained in certain Liassic coprolites which were 
identical in appearance with the Triassic pellets. The author con- 
cluded that the latter were the coprolites of Triassic amphibians which 
fed upon the same kind of Ganoid fishes as did the Ichthyosaurs 
of the Lias. 
The author had also examined microscopically the so-called 
“spine,” No. 1, fig. 2, and the jawbone, No. 2, of Mr. Metcalfe’s 
paper, and observed that there appeared to be no difference between 
the structure of the latter and that of reptilian bones, whilst its 
structure is different from that of the Lepidostean scale; with regard 
to the former, he stated that it was totally different from the spines 
of two species of Hybodus examined, and considered that there were 
no grounds for considering it a spine. 
