Messrs. Jones and Kirkby on Carboniferous Entomostraca. 33 
and polished, was the most numerous of those mentioned ; an- 
other, also white and polished, but larger and scarcer, is sub-. 
triangular, and evidently a Bairdia (fig. 20), somewhat crushed 
—a condition noticéd by Ure; it was rare, in a limestone-quarry 
fifteen miles west of Newcastle-on-Tyne, near the spot where 
the Roman wall is intersected by Watling Street. Figs. 16,17, 
and 21 are given as different views of one form, the scarcest of 
all: fig. 21 is certainly a Kirkbya badly drawn ; and the other two 
are Beyrichian in appearance (Beyrichia bituberculata, M‘Coy,, 
sp.). 
Diaaank the mounted specimens in the Hunterian Museum 
are Leperditia Okeni, Minster, var., Cytherella, Bairdia curta, 
M‘Coy, B. subcylindrica, Minster, and the Kirkbya roughly in- 
dicated by Ure’s fig. 21, which is K. Urei, Jones (Trans. Tyne- 
side Nat. Field-Club, 1859, p. 186; and Gray’s ‘ Biograph. 
Notice,’ &c., p. 52). 
Dr. Ure’s microscopic specimens seem to have been collected 
chiefly at Lawrieston and Stuartfield (East Kilbride). It 1s only 
of late that the energetic geologists of Glasgow have been able 
to rediscover the exact strata which yield them. In a letter 
dated July 4, 1865, our friend Mr. John, Young, of Glasgow, 
states— ; 
“Since I began to pay any; attention to the collecting of 
Entomostraca, I have often searched for the bed in which David) 
Ure obtained the specimens figured in his book, and also mounted ' 
in the Hunterian Museum in London and in the collection of * 
the Andersonian Institution in Glasgow; but as the quarries ; 
from which he got them. have been filled up, and as Ure does , 
not tell the nature of the strata from which he collected them, 
I have never been able to find them until the last week or two. . 
In examining some shale from the Calderside old limestone-. - 
quarries, near High Blantyre, Lanarkshire, I was fortunate in : 
again discovering Ure’s bed for the Airkbya, &c. It lies between » 
two beds of limestone, which crop out in both Blantyre and Kast ; 
Kilbride parishes.. This bed of shale is loaded with organisms . 
in a more or less perfect condition, namely Corals, Polyzoa, , 
Brachiopoda, Conchifera, Crinoids, Bivalve Entomostraca, Tri-. - 
lobites, &c. The shale soon breaks up on exposure. to. the 
weather, and then the minute organisms can easily be extractede. 
from it by washing.” Mr. John Young then refers to: some 
mounted specimens of Bairdie, Kirkbye, Cytherelle, and Hora- 
minifera, from this shale, that were kindly sent in his letter, and __ 
adds, “I find, on comparing the figures given by Ure with the , 
Entomostraca from Calderside, that he has made a mistake in , 
confounding two distinct forms as belonging to the same spe- . 
cies. Figs. 16,.17, and 21 he thought were the same. I find | 
Anmn..& Mag, N. Hist. Ser. 3. Vol. xviii. 3. 
e—- s 
