454 Prof. T. R. Jones and Mr. J. W. Kirkby on the 
The Cytherelle in this list do not require many remarks. 
Perhaps the reference to C. equalis, J. & K., is somewhat 
doubtful, though probably right. The examples of C. sero- 
biculata, J. & K., are worn, or in such condition as not to 
show the surface-ornamentation ; otherwise they agree exactly 
with that species. The unnamed Cytherella resembles C. con- 
cinna, J. & K., in its elongately oval outline, and may belong 
to it. 
Of Leperditia Armstrongiana, J. & K., there is only a 
single carapace of either a young or a dwarf individual. It 
is easily distinguished by its large antero-dorsal spine or 
“‘eye-spot”” and its very convex and obliquely gibbose 
ventral border. 
The only Beyrichia from Hurst is B. Bradyana, J. & K., 
which is probably its first noticed occurrence out of Scotland. 
In the latter country it is found in the lower portion of the 
Carboniferous-Limestone series. 
The three species of Kirkbya are all fairly common. The 
examples of K. permiana, Jones, are in beautiful preservation. 
So also are those of K. oblonga, in some of which the 
surface-reticulation takes the form of, or gives place to, regu- 
larly arranged stellate pits, similar to what Dr. John Young 
has noticed in rare examples of K. permiana. Such specimens 
are of great beauty under the microscope. The presence of 
K. Urei, Jones—the “ancient Scot” * of this genus—so far 
south is very interesting, though previously known from 
Northumberland and North Lancashire on the English side 
of the border. 
Bairdie are the most common Ostracods at Hurst, and are 
well represented in species and varieties. B. subelongata, 
J. & K., is perhaps the most abundant. B. Hisingeri 
(Minster) occurs in the long, slender, and altogether more 
elegant form that usually characterizes it in Yoredale Rocks, 
as well as in the Magnesian Limestone. Some of these speci- 
mens show a little peculiarity in their slightly oblique and 
rather subangulate dorsal border (see Pl. XXI. fig. 1). The 
specimens referred to B. amputata, Kirkby, differ from the 
type form in their more finely pitted or punctate surface and 
in the less truncate posterior extremity. 
Bythocypris cuneola, J. & K., and B. cornigera, J. & K., 
are abundant, as they usually are when present at all. The 
latter is larger and more robust than we have ever seen it 
(Pl. XXI. fig. 2); but in some individuals the horns are 
* Ancient, because it is one of those Carboniferous Ostracoda which 
the Rev. David Ure, of Rutherglen, collected in the West of Scotland 
so far back as 1793 or before. 
