174 CARBONICOLA, ANTHRACOMYA, AND NAIADITES. 
Anthracosia occidentalis, Swallow. Anthracoptera fragilis, Meek and Worthen. 
a subangulata, Dawson. — levis, Dawson. 
Anthracoptera carbonaria, Dawson. 
1889. S. A. Miller, in his work on ‘ North American Geology and Palzon- 
tology,’ gives at p. 462 a brief definition of the genus Anthracomya, referring 
several of Dawson’s Acadian species of Ndiadites to this genus, amongst them 
Naiadites carbonaria. On p. 463 he gives short definitions of Anthracoptera 
and Anthracosia, referring A. polita, White, to the former, and A. Bradorica to 
the latter genus. 
1894, A paper entitled ‘* Revision of the Bivalve Mollusks of the Coal-forma- 
tion of Nova Scotia,’ by Sir W. J. Dawson, was issued by the Peter-Redpath 
Museum. He reviews the whole question of the nomenclature of Anthracomya 
and Naiadites, and figures the following new species:—Naiadites longus, N. 
mytiloides, and Anthracomya obtenta. The older species are re-figured, and 
remarked upon at length. 
1896. Holroyd and Barnes, in vol. xxiv, pt. 5, ‘ Transactions Manchester 
Geol. Soe.,’ ‘On the Rocks and Fossils of the Yoredale Series of the Marsden 
and Saddleworth Valleys,’ note the occurrence of several species of Carbonicola 
in that series, amongst which I note C. turgida, C. acuta (small), and C. aquilina. 
Additional Notes on the Species. 
Carbonicola robusta (p. 45).—On p. 48 I remarked that the only specimens 
of this species that I had seen with eroded umbones were from Codnor Park, 
Derbyshire. I have since then acquired several specimens from Shotts, which 
show this condition remarkably well, one of which I figure, Pl. XXI, figs. 11 
and 12. The name Unio discrepans, Brown, 1849, ‘ Fossil Conchology,’ p. 213, 
pl. Ixxxviul, fig. 24, should be added to the synonymy of C. robusta. 
C. ovalis (p. 56).—To the synonymy of this species should be added 
Anthracosia centralis, Baily, 1875, ‘Figures of Characteristic British Fossils,’ 
p. 15, pl. xem, tie S: 
C. obtusa (p. 61).—This shell has been found in fair abundance in a 
bed of black shale a few yards above the Moss Coal in sinking a new pit at 
Longton, North Staffordshire Coal-field. It occurs with C. gibbosa, C. aquilina, 
C. acuta, and OC. turgida. 
C. nucularis (p. 63).—This species occurs in large quantities in the ‘ cockle- 
shell’? bands above the Rushey Park seam, St. Helens. The shells from this 
locality are much larger than those found in North Staffordshire, and exhibit 
