384 CONTRIBUTIONS TO CANADIAN PALEONTOLOGY, 



hemisphcerica, Hall, as occurring in the Oriskany sandstone and Cornife- 

 rous limestone of Ontario, but does not attempt to determine any of the 

 species from the Hamilton formation of that province. Professor H. A. 

 Nicholson, in his first "Report upon the Palieontology of the Province of 

 Ontario," published in 1874, ider^tifies Chonefes lineala, (Conrad not 

 Vanuxem) G. scitula, Hall, and C. lepida, Hall, as occurring in the Ham- 

 ilton formation of that province, but thinks that C. lepida may be the 

 young of C. scitida. It seems doubtful, also, whether the distinction 

 between the specimens from this formation, which Nicholson refers to C. 

 lineata and C. scitula, can be maintained. In the second part of this 

 volume, published in 1889, (p. 113) the writer identified a specimen from 

 Bartlett's Mills with the C. earinata (or coronata) of Conrad, and similar 

 specimens have since been collected at that locality. Mr. Schuchert 

 informs the writer that the species which he found at Thedford and Bart- 

 lett's Mills are (J. scitula, C. corotiata and C. vicina. 



Chonetes lineata (?) Conrad. 



Chonctes lineata, Nichohon. 1874. Rep. Pal. Prov. Ont., p. 73. 

 Calvin. 1888. Amer. Geologist, Vol. I., p. 83. 



"Abundant in the Hamilton Formation of Bartlett's Mills, near 

 Arkona, in the Township of Bosanquet,'' Nicholson. " Lower division 

 of the Hamilton Group on the Riviere aux Sables.'' Calvin. See the 

 remarks upon the preceding species. 



Strophalosia radicans, a. Winchell. (Sp.) 



Crania radicans, A. Winchell. 1866. Rep. Lower Renins. Mich., p. 02. 

 Strophalosia radicans, Beecher. 1890. Am. Journ. JSc. and Arts, Ser. 3, vol. XL., p. 243, 

 pi. 9, figs. 14-17. 



Thedford, in the "Middle third of the section", C. Schuchert, 1895: two 

 attached valves, showing the slender pi-oce-sses radiating therefrom, and 

 parasitic upon a badly preserved shell of a I'latyceran or Platyostoma. 

 Identified by Mr. Schuchert, and labelled United States National Mus- 

 eum Catalogue of Invertebrate Fossils, No. 26,565. 



Strophalosia truncata (?) Hall. (Sp.) 



Productella (Strophalosia) truncata ( HalljVfhitfAvea. 1889. This vol., pt. 2, p. 112, pi. 



16, figs. 1 and 2. 



A few specimens of a little spinose Strophalosia from Thedford and 

 Bartlett's Mills were identified with the Froductella truncata of Hall, in 

 the second part of this volume, on the authority of Professor R. P. Whit- 

 field, who had kindly compared them with authentic examples of that 

 species. Mr. Schuchert, however, in his MSS. list of fossils from these 



