DAVIDSON — SCOTTISH CAEBONIFEROUS BEACHTOPODA. 235 



its shell entirely preserved has hitherto come under my direct observation; 

 fragments showing the beautifully sculptured surface may be seen in the 

 Museum of Practical Geology, and which are stated to be from coraline limestone 

 north of St. Monace, in Tifeshire, and some casts have been likewise obtained 

 by Mr. Tate, at Lammerton, in argilaceous sandstone, a little above the Lam- 

 merton coal, and of which a specimen will be found represented upon our plate, 

 as well as a fragment of shell showing the sculptui-ed surface. Sp. lamhiosa has 

 some points of resemblance to Spiriferina cristata, var. odoplicata, but it is 

 readily distinguished by the greater number and comparatively smaller ribs, as 

 well as by other peculiarities. 



We have now completed our catalogue of the BracMopoda Mtherto 

 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 leng-thened 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 mil 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 wliich we did not possess sufficient 

 material. 



The Scottish Carboniferous strata have therefore famished 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 S][>i- 

 rifera striata, 8. Mosquensis, S. planata, S. triangularis, S. convolut i, 

 8. cuspidata, 8. distans, 8. triradialis, 8. integricosta, Cyrtina septosa, 

 G. carhonaria, Athijrjb expansa, Bhynchonella acuminata, B. reniformis, 

 B. flexistria, B. angulata, Ghonetes comoides, G. papilionacea, Productus 

 striatus, P. suh-loevis, P. plicatilis, P. humerosus, P. tessellatus, P. mar- 

 garitaceus, etc. Although I have no expectation that our Scottish 

 list 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 : — 



