NOTE ON LINGULA LESUEURI. 
73 
NOTE ON LINGULA LESUEURI , Rouault. 
BY THOS. DAVIDSON, LL.D,, F.R.S. 
I have already fully described and illustrated this very 
remarkable species, and revert to the subject once more in 
order to allude to the able researches by W. J. Harrison, 
F.G.S., and to his excellent and instructive memoir “ On the 
Quartzite Pebbles contained in the Drift and in the Triassic 
Strata of England; and on their derivation from an ancient 
land-barrier in Central England.” Lingula Lesueuri has 
again been collected in some abundance by Mr. Harrison in 
quartzite pebbles from the Drift at Moseley, near Birmingham. 
The specimens or casts are sometimes found in a fine state of 
preservation, but, as far as I have seen, are much smaller in 
size than those that occur in similar pebbles at Budleigli- 
Salterton. It is the only species of Brachiopod from the 
lower portion of the Llandeilo or “ Gr£s Armoricain ” that 
lias been hitherto obtained from the Drift of the Midland 
Counties, and it is somewhat remarkable that no example of 
Lingula Hawlcei , Lingula ? Salteri, or Dinobolus Brimonti, 
which occur so plentifully with L. Lesueuri in the Budleigh- 
Salterton and Brittany localities, should have hitherto turned 
up in the Moseley or other Birmingham Drift localities. 
Along with the Lingula Lesueuri pebbles at Moseley and else¬ 
where Mr. Harrison has found sandstone and quartzite 
pebbles of the age of the Caradoc or “Gres de May” with 
Orthis Budleighensis in great abundance, and in company 
with Orthis Valpyana , 0. elegantula, ? 0. unguis, O. calligramma, 
and Leptama sericea. A few fragments also of Middle- 
Llandovery rock with Stricldandinia lirata have been collected; 
also Lower-Devonian pebbles with SpiEfer Verneuili, Rh. 
Daleulenns , R. Valpyana , R. elliptica, R. Thebaulti , Orthis? 
laticosta ?, 0. Monnieri , Strophomena Edgelliana , Stroph. 
crenistria, and one or two other species which owing to their 
bad state of preservation I was unable to determine. 
No rock in situ has, however, been hitherto discovered in 
Great Britain containing Lingula Lesueuri. 
Mr. Harrison remarks that “it seems perfectly clear that 
the quartzite pebbles which occur so abundantly in the Drift 
of the Midland Counties were derived from the pebble-bed or 
conglomerate which forms the middle member of the Bunter 
Sandstone or Lower Trias.” 
I have carefully examined and described the Bracliiopoda 
from the Gres Armoricain ( Lower Silurian) of Brittany. It 
* From the Volume issued by the Palasontographical Society for 1883. 
