312 
SUPPLEMENT TO THE BRITISH 
Genus Chonetes, Fischer. 
44. Chonetes Laguessiana, de Koninck. Dav., Carb. Mon., p. 186, P.l XLVII, figs. 
12—16, 17, 18, and 25? (as Chonetes Har- 
drensis, Phil). ; Sup., PI. XXXIV, fig. 18. 
Chonetes Laguessiana, de KonincTc. Description des Animaux fossiles du Terrain 
Carbonifere de Belgique, p. 211, pi. xii bis, figs. 4 a, b, 
1843, and ' Monographic du genre Chonetes,' p. 198, 
pi. XX, figs. 6 a,b,c, 1847. 
At p. 186 of my Monograph I described this Carboniferous Chonetes under Phillips' 
name Hardrensis, but in so doing I did not fail to observe, " It is not without some 
hesitation that the term Hardrensis is provisionally retained." Since the publication of 
my Monograph Prof. L. de Koninck has assured me that he feels convinced that the 
Carboniferous species in question is referable to his C. Laguessiana, and not to the 
Devonian C. Hardrensis. I am willing to adhere to his view upon the subject, although 
the two forms appear to me closely related. Chonetes Laguessiana has been discovered 
by the Rev. W. Downes in an indurated sandstone of the Culm-measure Limestone, at 
Westleigh, in the Carboniferous area that lies between it and the Devonians of North 
and South Devon.^ The Brachiopoda in this rock, and in a dark, hard, crystalline lime- 
stone or marble in the neighbourhood of Kentisbeare, Collumpton, are of extremely 
scanty occurrence, and are so mentioned both by De la Beche and Phillips f and 
after a long search the Rev. W. Downes has discovered only two good examples of 
C. Laguessiana, one of undoubted Orthis Michelini, and some four very badly preserved 
incomplete and not identifiable specimens of Sjnrifer, evidently referable to two 
species. Along with these occur inpressions of Posidonomga Becheri or lateralis.^ 
' See a paper by the Eev. W. Downes, entitled " The Fossils of the Culm-measure Limestones 
around Holcombe Rogus " ('Trans, of the Devon. Assoc. for the Advancement of Science, Literature, and 
Art,' 1878, and appendix). Mr. Downes observes: — "The area which I searched may be generally 
described as that which is included within a radius of about two miles from the village of Holcombe 
Rogus on all sides of it. It is marked in the Ordnance Map by five nearly parallel ridges of limestone 
rock, extending from Lear and Kitton on the north, and Rocknal, Westleigh, and Canousleigh on the 
south. Among these limestone ridges there are more than twenty quarries, all of which I have searched 
diligently." 
2 ' Report on the Geology of Cornwall, Devon, and West Somerset,' 1839. 
^ 'Palaeozoic Fossils of Cornwall, Devon, and West Somerset,' 1841. 
* These fossils were kindly forwarded to me by the llev. W. Downes for identification. 
