CRITICAL BIBLIOGRAPHY. 27 
He figures also— 
Anthracomya modiolaris. Anthracosia acuta. 
Myalina quadrata. 3 aquilina. 
45 modiolaris. ar ovalis. 
6 carinata. 
He discusses at some length the salt or fresh-water habitat of these groups, 
and endeavours to demonstrate that the Anthracosia were allied to the Myacide, 
and were burrowers. 
1862. The next year he published in the Appendix to the ‘ Geological Survey 
Memoir,’ ‘ The Geology of the Country round Wigan,” 2nd edition, a figure of 
Anthracosia robusta, showing the hinge, and the diagnosis, with diagrammatic 
figure, of his new genus Anthracoptera, the Myalina of his previous memoir. The 
description is curious, because he affirms the existence of “an obscure tooth in 
the anterior part of the hinge-line,” and founds his genus to include those 
aviculoid shells “ which have not the striated hinge-plate of Myalina,” a character 
which I have shown’ they have. He apparently made a species (A. Browniana) 
by dotting in a characteristic outline to the figure of another shell. In the same 
year, in the Appendix to Part IV of the ‘ Iron Ores,’ he gives lists of the twelve 
mollusca of the North Staffordshire Coal-field, and the horizons at which they 
occur, on the authority of Mr. John Ward, F.G.8., of Longton; and in 1864, in 
the Appendix to the ‘ Geological Survey Memoir: the Country round Oldham,’ 
he gives lists and horizons of Unio forms from the Lancashire Coal-field. Later 
on, in his list of fossils in ‘The Country round Bolton,’ he mentions a new form, 
Anthracomya sanguinolaria, MS.; but there has been no other reference made to 
it, and it is impossible to ascertain now what was the particular form for which 
the name was intended. Mr. Salter gives also numerous other lists in subsequent 
Geological Survey Memoirs, but does not give in them any further contributions 
of importance to the subject. 
1863. In 1863, however, in a paper ‘‘ On some Fossil Crustacea from the Coal- 
measures and Devonian Rocks of British North America,” in the ‘ Quart. Journ. 
Geol. Soc.,’ vol. xix, pp. 79, 80, treating of Some Fossils from the South Joggins Coal- 
field, Mr. Salter figured and described Anthracomya elongata (fig. 1), Anthracoptera 
carbonaria (fig. 3, a different figure from that of Dawson’s Naiadites carbonaria), 
and Anthracoptera (Naiadites, p. 78) levis (fig. 2, and p. 80), substituting these 
generic names for ‘‘ Naiadites’ proposed by Dr. Dawson, but without description.” 
Anthracomya elongata, p. 79, fig. 1. 
Naiadites levis, p, 79, fig. 2 (Anthracomya, p. 80) f Naiadites, Dawson, p. 80. 
Anthracoptera carbonaria, p. 79, fig. 3. 


1 «Quart. Journ. Geol. Soc.,’ vol. xlix, 1893, pl. vii, figs. 1, 2. 
2 On February 21st, 1894, a note “On the Genus Naiadites occurring in the Coal-formation of 
