22 CARBONICOLA, ANTHRACOMYA, AND NAIADITES. 
1856. This description King pointed out, in a note (dated December 27th, 
1855) appended to his paper ‘‘On Anthracosia, &.,’”’' could not be accepted for 
his shell. He said, ‘‘ A few days ago (December 22nd) I received from Professor 
Sedgwick, for the library of Queen’s College, Galway, the Third Fasciculus of 
his ‘ Synopsis of the Classification of British Paleozoic Rocks,’ in which I perceive 
that Professor McCoy has published a genus under the name Carbonicola. My 
friend evidently thinks it synonymous with Anthracosia, which he admits being 
aware that I intended describing. However, if the genus Carbonicola possess the 
characters diagnosed by Professor McCoy, it is clearly not the same as my 
Anthracosia, which does not possess lateral teeth. There are certain errors in the 
remarks under the genus Carbonicola, which it must be obvious to anyone that I 
am not called upon to correct; but it is otherwise with several interspersed 
through the work,” &c., December 27th, 1855. 
It is a curious fact that amongst the many hundreds of shells I have seen and 
examined from British and foreign Coal-measures none possess anterior or pos- 
terior lateral hinge-teeth, nor is there any specimen in the Woodwardian Museum 
at Cambridge, where Professor McCoy obtained his types, which answers to his 
description. I can altogether bear out Professor King’s contention that, what- 
ever the shell which Professor McCoy thought he was describing may have been, 
it could not have been an interior of one of the Coal-measure bivalves. Was he 
drawing from his knowledge of recent Unios, and, like Sowerby, de Koninck and 
later on Salter, stating what he thought probably would be seen if he obtained an 
interior P 
Professor McCoy enumerated under his genus Carbonicola the following 
species : 
Carbonicola acuta. Carbonicola subconstricta, var. robusta. 
subconstricta. 3 turgida, Brown. 
He gave reasons for considering C. robusta as only a variety of swhconstricta. 
Professor King in his paper (supra cit.) gives a good description of the 
generic characters of Anthracosia, and shows reasons for considering that it 
belongs to the family Unionide. He gives figures of the hinges of Anthracosia 
Beaniana, and the exteriors of Anthracosia acuta, Sow., and Anthracosia Smithii, 
Brown. 
The description of the hinge and teeth, as given by Professor King, is rather 
complex, and is the form of hinge which the species Anthracosia aquilina possesses. 
I shall, I think, show that King’s A. Beaniana is one of the varietal forms of 
A, aquilina. 
1 «Ann. Mag. Nat. Hist.,’ ser. 2, vol. xviii, January, 1856, pp. 51—47, pl. iv. 
