CRITICAL BIBLIOGRAPHY. 



31 



pp. 243, 244, Mr. R. Btheridge, jun., gives a bibliographical account and a full 

 accurate description of Anthracomya Phillip sii ; and describes and figures a new- 

 form, Anthracomya Scotica, which he compares with Naiadites laevis, Dawson 

 (Salter), and JJnio nuciformis of Hibbert. 



1878. His next contribution to the subject was in 1878, in the ' Quart. Journ. 

 Geol. Soc.,' vol. xxxiv, " On our Present Knowledge of the Invertebrate Fauna of the 

 Lower Carboniferous and Calciferous Sandsone Series," read November 7th, 1877. 

 He re-describes Salter's genus of Anthracoptera, and doubtfully gives a new species, 

 Anthracoptera (?) obesa (p. 12), pi. i, figs. 12, 13, 14 (?). He also makes some addi- 

 tional remarks on Myalina crassa, and describes and figures another form as 

 Myalina sublamellosa, pi. i, fig. 15; pi. ii, figs. 16, 17. A specimen, pi. ii, fig. 20, 

 is also doubtfully referred to Anthracosia nucleus, Brown, and Axinus Pentlandicus 

 (pars), Rhind. 



1879-81. In 1879, in the Appendix to the ' Geological Survey Memoir Scotland,' 

 Explanation of Sheet 31, full lists of localities of shells occurring in the district are 

 given, unfortunately often without specific names ; and a new form of Anthracoptera, 

 A. tumida is described (without a figure) from the " Edge Coal " series, and its 

 specific characters discussed at p. 82. Again, in 1881, in his Address delivered 

 before the Royal Physical Society of Edinburgh, on " The Palaeozoic Conchology 

 of Scotland," pp. 48, 50, and 53, the generic affinities and the habitats of the genera 

 Anthracoptera (Naiadites), Anthracomya, and Anthracosia (Carbonicola) are dis- 

 cussed. He sums up, " Anthracosia was probably not a purely fresh-water genus, 

 but of brackish water habit." 



1875. In a valuable paper on the " Organic Remains of the Coal-measures of 

 North Staffordshire," published in the ' Proceedings of the North Staffordshire 

 Field Club and Archasological Society,' 1875, p. 184, Mr. John Ward, F.G.S., gives 

 a list of the Anthracosia, Anthracomyse, and Anthracopterse, and a record of the 

 horizons at which they occur. He describes no new forms, and figures none of 

 the shells, but gives full references to his authorities. The paper contains a short 

 discussion on the vexed question of habitat ; and he believes he has found Anthra- 

 cosia in the vertical position in the " Cockshead Shale." 



A fuller account appeared in his monograph, " Geology of the North Stafford- 

 shire Coal-field, ' Trans. N. Staff. Institute of Mining and Mechanical Engineers,' 

 vol. x, part v, issued in 1890, and pi. i contains figures of — 



Anthracosia robusta. 



„ acuta (a fine interior). 



„ centralis ?. 



„ aquilina ? . 



Anthracomya Adamsii. 



„ Adamsii (allied to A. modiolaris) . 



Anthracomya modiolaris {Anthracoptera) . 



„ carinata (Anthracoptera). 



Modiola lithodomoides, on the authority of R. 



Etheridge, sen. (Anthracomya lanceolata, 



Hind). 



