DAVIDSON — SCOTTISH CARBONIFEROUS BRACIIIOPODA. 
235 
its shell cutircly preserved has hitherto come under my direct observation ; 
fragnieuts showing the beautifully sculptured surface may be seeu in the 
Museum of i'raetical Geology, and which are stated to be from coralinc limesf ouc 
uorth of St. Monaee, in Fifeshire, and some easts have been likewise obtained 
by Mr. Tate, at Laiumertou, iu argilaccous sandstone, a little above the Lam- 
merton coal, and of which a s])ccinieu will be found represented upon our plate, 
as well as a fragment of shell showing the sculptured surface. Sp. laminona lias 
some poiuts of resemblance to Spirifcriiia cristata, var. odoplicaia, but it is 
readily distuiguished by the greater number and comparatively smaller ribsj as 
well as by other peculiarities. 
We have now completed our catalogue of the Brachiopoda hitherto 
discovered in the Scottish Carboniferous system ; and although the 
results of our researches are no doubt very imperfect, and that the 
subject will require a far more lengthened investigation, still every 
effort has been made to lay before the reader as complete a mono- 
graph as the material and observations at present assembled would 
permit. Time and continued researches will no doubt enable 
palaeontologists to correct the errors here inadvertently committed, 
as well as to determine those points which we have unavoid- 
ably left as unsettled, or provisional, and especially so with re- 
ference to some few forms, of which we did not possess sufficient 
material. 
The Scottish Cai'boniferous strata have therefore furnished us with 
about forty-nine or fifty species, among which may be noticed many 
of the most general and characteristic forms of the system ; but many 
other species that are common in England and Ireland have not been 
discovered in our Scottish strata, among these we may mention Spi- 
rifera striata, 8. Mosquensis, 8. planata, 8. triangularis, 8. convoluta, 
8. cuspidata, 8. distans, 8. triradialis, 8. iiitegricosta, Cyrtina septosa, 
C. carhonaria, Atliyra expansa, Rhynchonella acuminata, R. reniformis, 
R. flexistria, It. angulata, Chonetes comoides, C . papilionacea, Productus 
striatus, P. sub-l(Bvis, P. plicatilis, P. humerosus, P. tessellatus, P. mar- 
garitaceus, etc. Although I have no expectation that our Scottish 
hst will ever be very materially increased, still with diligent search a 
few more species may perhaps in time be added to those with 
which we are at present acquainted. 
Belgium is very rich in Carboniferous Brachiopoda, and possesses 
a certain number of species that have not been discovered in Great 
Britain ; and with the view to ascertain which were common to Scot- 
land and to that country, I furnished Prof, de Koninck with a list 
and figures of our shells, and requested him at the same time to 
arrange our species which were found also in Belgium into his 
respective faunas of Vise and Tournay, and have been favoured with 
the following tabular view : — 
