ANTHRACOMYA. 83 
Littorina, the real generic affinities of which have never been accurately made out, 
Mr. Kirkby writes me that ‘latterly Mr. R. Etheridge, jun., thought it might be 
nearer Paludina.” He goes on to say: “ This little univalve, however, occurs 
sometimes with Murchisonia, Macrocheilus, and Schizodus, which are good types 
of marine Mollusca, besides with Bairdia, Kirkbya, Cytherella, and Leperditia, 
which are just as good genera of marine Ostracoda ; and moreover at other times 
it is found with species of Carbonia, which is the most non-marine of all the 
Carboniferous Ostracoda.’? On the whole, the evidence as to the nature of the 
deposit is somewhat uncertain and unsatisfactory, but I am disposed to value the 
absence of typical marine Mollusca to a greater extent than the presence or 
absence of genera of Ostracods, whether marine or not. 
Genus Anruracomya, Salter, 1862. 
Synonynis : 
Unio, Williamson, 1836. 
— Phillips, 1839. 
— Prestwich and Sowerby, 1834-36.) 
— Goldfuss, 1838. 
Anodonta, Eichwald, 1840. 
Mytilus (Modiola), Murchison, de Keyserling, and de Verneuil, 1845. 
Unio, Morris, 1843, 1854. 
Cardinia, de Ryckholt, 1849. 
Mytilus, de Ryckholt, 1849. 
Modiola, Brown, 1849. 
Unio, Brown, 1849. 
— Bronn and Romer, 1852-54. 
Modiolopsis (7), Eichwald, 1855-59. 
Naiadites (pars), Dawson, 1860 and 1878. 
Anodonta, Ludwig, 1861. 
Anthracomya, Wardle, 1862. 
Unio, Ludwig, 1863. 
Cyrena (Cyelas), Ludwig, 1863. 
Plewrophorus, Meek and Worthen, 1866. 
Anthracosia, Geinitz, 1867. 
Modiola, Romer, 1870. 
Anthracomya, R. Etheridge, jun., 1877. 
Anthracosia, Kinahan, 1878. 
Myacites, Kinahan, 1878. 
Anthracosia, Baily, 1881. 


1 This paper was read on February 5th, 1834, and April 15th and 27th, 1836, though the 
publication bears the date 1840. 
