DAVIDSON — SCOTTISH CARBONIFKROUS BRACHIOPODA. 221 
Until within a twelvemonth since, or less, Scottish and other geologists had 
been in the habit of distinguishing the Chonetcs we are now describing by the 
name llardrends ; subsequently, from finding at p. 206 of the " Monographic 
dii Genre Chonetcs" that Prof, de Koninek had referred the shell, pi. xvi., figs. 
10-11 of lire's "History of Rutherglcn, etc.," to D'Orbignj's C. variolata, tlie 
last-mentioned name was by many adopted for the species, and likewise so 
labelled upon the tablets in tlie Museum of Practical Geology. With the desire 
to arrive, if possible, at a correct identification, I forwarded several specimens 
of the Scottish shell to Prof, dc Koninek, in order to ascertain whether he was 
satisfied that the shell in question really belonged to D'Orbigny's species, as 
had been so stated to be in his " Monographic ;" and in answer I was informed 
that he had subsequently determined that our shell could not be refeiTcd to 
C. variolata, which last possessed finer and more numerous striae ; that the 
Scottish shell occurred also at Yise, in Belgium ; and that he had intended to 
describe it in the supplement to his " Monographic" by the name of C. alternata. 
I must also mention that having obtained from Sir Richard Griffith the loan of 
Prof. M'Coy's various so-termed species of Chonetcs, it did appear to me that 
several among them, such as C. sulcata, C. voloa, C. gibberula, and one or two 
others should be united into a single species, and that they were Hkewise 
specifically undistinguishable from our Scottish shell (?) ; but here again my 
distinguished Belgian friend disagreed with me ; for although he was prepared 
to admit that C. volva, C. sulcata, C. crassisfria, and C. gibberula should be 
united into a single species, he still considered his C. alternata — our Scottish 
shell — as specifically distinct. I also received from Prof. Phillips the loan of 
his four best and figured examples of C. Uardrensis ; and having compared 
these with several of our Scottish specimens, the result was that I could per- 
ceive no differences in the shape, areas, and striation, so that I deemed it pre- 
ferable to allow our Scottish Chonetes to retain the name Eardrensis until the 
subject might be fui'ther discussed. But I am, however, unable to perceive 
what led Professor Phillips to suppose that his species was provided with 
" large cordiform muscidar impressions ;" and in conclusion I must also observe 
that although the ribs of C. variolata appear to be finer and more numerous than 
is the case with the generality of specimens of C. Uardrensis, there does not 
appear to exist much difference in the shape of the Scottish and American 
species. 
C. Uardrensis is found at Gare, in Lanarkshire, at two hundred and thirty- 
nine fathoms below " EU coal three hiuidred and forty-three at Raes GUl ; 
three hundred and fifty six at Hillhead. It occurs also at Capel Rig, East 
Kilbride ; Auchentibber and Calderside, High Blantyre ; Brockley and Middle- 
holm, near Lesmahago ; and Robroyston, north of Glasgow. In Renfrew- 
shire, at Arden- and Orchard-quarries, Thornliebank. In Stirlingshire, in 
various stages, such as Craigenglen, Mill Burn, the Campsie main limestone, 
Corrie Burn, etc. In Ayrshii-e, at West Broadstone, Beith ; Auchenskeigh, 
Dairy ; Goldcraig, Kilwinning ; Hallerhirst, Stevenston, and Craigie, near Kil- 
marnock. In Haddingtonshire, at East Barns, near Dunbar. It has also been 
found in Pifeshire and ia the island of Arran. 
XLIII. — Chonetes Buchiana. De Koninek. PI. ii., fig. 1. 
Chonetes BucMana. De Koninck's "Description des Animaux Eossiles du 
Terrain Carbonifere de la Belgique," p. 208, pi. xiii., fig. 1, 1843 ; and 
" Monographic du Genre Chonetes," p. 218, pi. xx., fig. 17. 
The valves in this species are concavo-convex, and marginally semi-circular, 
with a straight hinge-line as long as the greatest width of the shell. The 
ventral valve is moderatehv convex, and somewhat flattened near the hinge-line, 
