178 



Platystrophia hiforata, Winchell and Schu- 



chert 1893. Lower Silur. Braoh. Minn., p. 455 



(which see for a fuller list of synonyms of 

 N. Amer. specimens of this species than it 

 is thought necessary to quote here), pi. 

 33, figs. 49-52. 



Abundant at Lower Fort Garry, where it was collected by Sir James 

 Hector in 1857, by Dr. R. Bell in 1880, and by Mr. Weston in 1884. 



Lake Winnipeg, at Big Grindstone Point, where a small but nearly 

 perfect ventral valve was collected by Mr. Weston in 1884. 



All the specimens from Manitoba that the writer has seen (like those 

 from the Galena and Trenton shales of Minnesota described by Winchell 

 and Schuchert) belong to the small and typical form of this species, and 

 not to the "large and globose variety lynx, as defined by Meek," in the 

 first volume of the Palseontology of Ohio. 



Platystrophia biforata, var. crassa. 



Orthis [Platystrophia) crassa, James (non- 



Lindstrom) 1874. Cincinnati Quart. .Tourn. Sc, vol. I. , 



p. 20. 



Orthis dentata. Miller 1875. Ibidem, vol. II., p. 27. 



■Orthis centrosa, Miller 1889. N. Am. Geol. Und Palaeont., p. 35G. 



Platystrophia crassa. Hall 1892. Pal. N. York, vol. VIII., pt. 1, p. 223. 



Platystrophia biforata, var. crassa, Winchell 



and Schuchert 1893. Lower Silur. Brach. Minn., p. 458, 



pi. 33, figs. 55 and 56. 



Lake Winnipeg, at Little Black Island and at the south end of Snake 

 Island, D. B. Dowling and L. M. Lambe, 1890 : one good specimen from 

 each of these localities. 



Rhynohoteema capax, Conrad. (Sp.) 



Atrypa capax, Conrad 1842. Journ. Ac. Nat. Sc. Philad., vol. 



VIII., p. 264, pi. 14, fig. 21. 

 Atrypa increbescens (partim). Hall 1847. Pal. N. York, vol. I., p. 146, pi. 33, 



figs. 13 I, and 13, k-y. 

 II Billings 1856. Canad. Nat. and G-eol., vol. I., p. 207, 



figs. 15 and 16. 

 Hall 1860. Thirteenth Rep. N. Y. St. Cab. Nat. 



Hist., p. 66, figs. 6, 7, 9-11. 



Rhynchonella increbescens (partim), Hall 1862. Geol. Wiscons., vol. I., p. 55, figs. 5-7. 



Bhynchonella capiax, Billings 1863. Geol. Canada, p, 211, figs. 213, a-o. 



And of several other subsequent writers on 



N. Am. Palaeontology. 

 Ehynchotrema capax, Winchell and Schu- 

 chert 1893. Lower Silur. Braoh. Minn., p. 462, pi. 



34, figs. 30-34. 



