122 



Lower beds, Dr. R. W. Ells, 1875, Dr. R. Bell, 1879, and T. C. W es 

 ton, 1884 : large, abundant and well preserved. Upper beds, T. C. Wes- 

 ton, 1884 : several fine natural casts of the interior of shells of this 

 species. 



Rhynchonella Anticostiensis, Billings. 



Shynchonella Anticostieiisis, 'BiWings 1862. Geol. Surv. Canada, Pal. Foss., 



vol. I., p. 142, figs. 119, a-c. 



" " " 1863. Geol. Canada, p. 211, figs. 212, a-c. 



Bhynchondla (?) .<ln<Jco«fa'«n«8s, Winchell 



& Schuohert 1893. Lower Silur. Braohiop. Minn., p. 



464, figs. 34, a-c. 



Lower beds, T. C. Weston, 1884 : five specimens with the test pre- 

 served. Upper beds, T. C. Weston, 1884 : three natural casts of the in- 

 terior of the shell. 



MOLLUSCA. 



PELEGYPODA. 

 Byssonychia obesa, Ulrich. 



Byssonychia obesa, Ulrich .. 1893. Rep. Geol. Surv. Ohio, vol. VII., p. 630, pi. 45, 

 figs. 10-12. 

 Lower beds, T. C. Weston, 1884 : a cast of the interior of the closed 

 valves, which has been identified with this species by Mr. Ulrich. 



Plethocardia. (Sp. nov. ?) 



"Like P. suherecta, Ulrich, but anterior side too imperfect for certainty. 

 On the other hand, the general aspect is decidedly like that of Whitella 

 megamhona, Whitfield, sp." Ulrich, in letter dated April 4, 1894. 



Lower beds, T. C. Weston, 1884 : an imperfect cast of the interior of a 

 specimen with the valves closed. 



GASTEROPODA.* 

 Pleurotomaeia bicincta, Hall. (Sp.) 



Murchisonia hiciucta, Hall 1847. Pal. N. York, vol. I., p. 177, pi. 



38, figs. 5 a-h, but not M. biciiirta, 

 McCoy, 1844. 



*A11 the species of Gasteropoda in this list are represented in the Survey collection 

 by mere casts of the interior of the shell. 



