174 CARBONICOLA, ANTHRACOMYA, AND NAIADITES. 



Anthraeosia occidentalis, Swallow. 

 — subangulata, Dawson. 



Anthracoptera carhonaria, Dawson. 



Anthracoptera fragilis. Meek and Worthen. 

 — Isevis, Dawson. 



1889. S. A. Miller, in his work on ' JSTortli American Geology and Palaeon- 

 tology,' gives at p. 462 a brief definition of the genus Anthracomya, referring 

 several of Dawson's Acadian species of Naiadites to this genus, amongst them 

 Naiadites carhonaria. On p. 463 he gives short definitions of Anthracoptera 

 and Anthraeosia, referring A. ]Jolita, 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. Soc.,' " 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 G. aquilina. 



Additional Notes on the SjJecies. 



Garhonicola rohitsta (p. 45). — On p. 48 I remarked that the only specimens 

 of this species that I had seen with eroded umbones were from Oodnor Park, 

 Derbyshire. I have since then acquired several specimens from Shotts, which 

 show this condition remarkably well, one of which I figure, PI. XXI, figs. 11 

 and 12. The name U7iio discrepans, Br ov^n, 1849, 'Fossil Conchology,' p. 213, 

 pi. Ixxxviii, fig. 24, should be added to the synonymy of G. robusta. 



G. ovalis (p. 56). — To the synonymy of this species should be added 

 Anthraeosia centralis, Baily, 1875, ' Figures of Characteristic British Fossils,' 

 p. 115, pi. xxxix, fig. 8. 



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 G. yibhosa, G. aquilina, 

 G. acuta, and G. turgida. 



G. 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 



