ON THE EARTHQUAKE PHENOMENA OF JAPAN. 215 
being produced at the time of earthquakes. Another set of records, which 
we are in possession of, indicate that many earthquakes have been 
preceded by earth-currents. 
Tf, as we have reason to believe, certain earthquakes are the result of 
a sudden breaking in the rocky crust of the earth, produced by bend+ 
ing due, for example, to elevatory pressure, it would seem possible that, 
in consequence of the compressions and extensions to which the rocks are 
subjected prior to their collapse, electrical phenomena might be produced. 
To test the truth of this supposition Mr. T. Gray has undertaken a 
series of experiments which are not completed. Preliminary results of 
these experiments seem to indicate that a difference of potential is 
produced between the two sides of a slab of rock when it is bent. 
Report of the Committee, consisting of Mr. R. ErHerince, Dr. H. 
Woopwarp, and Professor T, RUPERT Jones (Secretary), on the 
Fossil Phyllopoda of the Paleozoic Rocks. 
Or the collections known to contain many of the fossil Phyllopods, those 
in the British Museum and the Museum of Practical Geology, in London, 
that of the Woodwardian Museum, Cambridge, and of Owens College, 
Manchester, have been carefully examined ; and sketches have been made 
of the numerous specimens. ‘Tracings of all the published figures have 
also been carefully made, to ensure ready collation of the many different 
forms. Information has been cheerfully communicated by Mr. Homfray, 
Mr. Valpy, Mr. Marr, and others, who have collected specimens at various 
times and places. 
Time has not yet allowed of our inspection of the Phyllopodous fossils 
at the Oxford University Museum, nor at the Ludlow, Glasgow, Hdin- 
burgh, and other rich museums; but from the type specimens preserved 
either in London or at Cambridge, we have been able to make the follow- 
ing observations on Hymenocaris, Caryocaris, and Lingulocaris, three of 
the oldest genera; and the accompanying synopsis indicates our present 
opinion of the relationship and range of all the genera with which we are 
acquainted, either by personal inspection or by study of the illustrations 
i descriptions given by our fellow-workers in North America and else- 
where. 
During our study of Hymenocaris we found that ‘ H. ? major,’ Salter, 
_comprised a Ceratiocaris possibly matching the Tremadoc specimens 
assigned to the genus by Mr. Salter; and we have therefore put it under 
the more authentic of the two Tremadoc species noticed by him. 
The Australian Hymenocaris Salteri,-M‘Coy, having been assigned by 
Mr. Salter to Caryocaris, when he was studying that group in 1862, we 
have regarded it as a member of the latter genus. 
With Caryocaris Marrii, Hicks, is a specimen associated under the 
same name in the Woodwardian Museum that proves to be an Hntomidella ; 
as it differs somewhat from the known species of that genus, it is now 
named H. Marrti. Of the other specimens named OC. Marrii, some do 
not differ from C. Wrightii, Salter; but one retains the specific name 
given by Dr. Hicks. 
Besides the Lingulocaris lingulecomes, Salter, some casts in the British 
Museum seem to warrant the adoption of a new name, L. siliquiformis, 
for a different but allied form. . 
