CRITICAL BIBLIOGRAPHY. 31 
pp. 243, 244, Mr. R. Etheridge, jun., gives a bibliographical account and a full 
accurate description of Anthracomya Phillipsii; and describes and figures a new 
form, Anthracomya Scotica, which he compares with Naiadites levis, Dawson 
(Salter), and Unio 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), pl. i, figs. 12, 15, 14(?). He also makes some addi- 
tional remarks on Myalina crassa, and describes and figures another form as 
Myalina sublamellosa, pl. i, fig. 15; pl. u, figs. 16,17. A specimen, pl. ui, fig. 20, 
is also doubtfully referred to Anthracosia nucleus, Brown, and Avinus 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 ; anda 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 Palzeozoic 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 Archeological Society,’ 1875, p. 184, Mr. John Ward, F.G.S., gives 
a list of the Anthracosiw, Anthracomyex, and Anthracoptere, 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 pl. i contains figures of— 
Anthracosia robusta. Anthracomya modiolaris (Anthracoptera). 
7 acuta (a fine interior). 3 carinata (Anthracoptera). 
s centralis ?. Modiola lithodomoides, on the authority of R. 
- aquilina ?. Etheridge, sen. (Anthracomya lanceolata, 
Anthracomya Adamsii. Hind). 
33 Adamsii (allied to A. modiolaris). 
