ANTHRACOMYA. 83 



Littorina, the real generic affinities of which have never been accurately made out, 

 Mr. Kirkby writes me that " latterly Mr. R. Btheridge, 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 Anthracomya, Salter, 1862. 



Synonyms : 



Unto, Williamson, 1836. 



— Phillips, 1839. 



— Prestwich and Sowerby, 1834-36.' 



— Qoldfuss, 1838. 

 Anodonta, Eichwald, 1840. 



My til us (Modiola), Murchison, de Keyserling, and de Verneuil, 1845. 



TJnio, Morris, 1843, 1854. 



Cardinia, de Eyckholt, 1.S49. 



Mytilus, de Eyckholt, 1849. 



Modiola, Brown, 1849. 



TJnio, Brown, 1819. 



— Bronn and Bonier, 1852-54. 

 Modiolopsis(f), Eichwald, 1855-59. 

 Naiadites (pars), Dawson, 1860 and 1878. 

 Anodonta, Lndwig, 1861. 

 Anthracomya, Wardle, 1862. 



TJnio, Ludwig, 1863. 



Cyrena (Cyclas), Ludwig, 1863. 



Pleurophorus, Meek and Worthen, 1866. 



Anthracosia, Greinitz, 1867. 



Modiola, Bonier, 1870. 



Anthracomya, E. Etlieridge, jun., 1S77. 



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 1810. 



