WHiTEAVES. J FOSSILS OP HAMILTON FORMATION OP ONTAEIO. 383 



Strophomcna nacrea, Nicholson. 1874. Rep. Pal. Prov. Ont., p. 68, and p. 69, fig. 21. 

 Strophcndonta ( Pholidostrophia ) nacrea. Hall and Clarke. 1892. Pal. N. York, vol. 



VIII., pt. 1, p. 287, pi. 15, figs. 20-24. 

 Pholidostrophia iowaensis, Schuohert. 1897. Synops. Amer. Foss. Brachiop., p. 308. 



According to Mr. Schuchert (op. cit. supra.) Owen's types of Chonetes 

 loiceasis, " preservad in the United States National Museum prove to be 

 identical with Strophomena lepida, which Hall in 1867 said is a synonym 

 for Slrojjheodonta nacrea.'' 



Orthothetes Ciiemungensis, var. arctostriata, Hall. 



Strophomena arctostriata, Hall. 1842. Gcol. Rep. Fourth Distr. N. York, p. 266, fig. 2. 

 Orthisina arctostriata. Hall. 1860. Thirteenth Rep. N. Y. St. Cab. Nat. Hist., p. 60. 

 Streptorhi/nchus chemunffcnsis, var. arctostriata, Hall. 1867. Pal. N. York, vol. IV., 



p. 71, pi. 9, figs. 1-12. 

 Orthothetes chemungensis, var. arctostriata. Hall and Clarke. 1892. Pal. N. York, vol. 



VIII., pt. 1, pi. 10, fig. 8, and expl. of that 



plate. 



Mr. Schuchert has identified with this variety of 0. Chemungensis a 

 few specimens which he collected in the " Upper and Lower third of the 

 section" at Bartlett's Mills, in 1895, and since thensimilar specimens have 

 been collected by Mr. Kernahan and Mr. Walker at the same locality. 



Orthothetes anomalus, A. Winchell. (Sp.) 



Crania ( Pseadocrania) a.nomala, Winchell. 1866. Rep. Lower Penins. Mich., p. 92. 

 Pseudocrania anomala. Miller. 1889. N. Amer. Geol. and Palaaont., p. 366. 



Bartlett's Mills, in the "Middle third of the section," C. Schuchert, 

 1895 : two specimens which were identified by Mr. Schuchert, and are No. 

 26,558 of the United States Museum Catalogue of Invertebrate Fossils. 



Chonetes vicina, Castelneau. (Sp.) 



Leptcena vicina, Castelneau. 1843. Essai sur le Syst. Silur. de I'Amer. Septentr., p. 39. 

 Chonetes dclecta, Hall. 1857. Tenth Rep. N. Y. St. Cab. Nat. Hist., p. 149. 

 Chonetes ijibhosa. Hall. 1S57. Ibid. p. 145. 



Chonetes dcflecta. Hall. 1867. Pal. N. York, vol. IV., p. 126, pi. 21, figs. 7, 8. 

 Chonetes vicinus, Schuchert. 1897. Synops. Amer. Foss. Brachiop., p. 180. 



" Thedford and Bartlett's Mills, in the Lower third of the section," C. 

 Schuchert, 1895 : several specimens, identified by Mr. Schuohert and 

 labelled No. 25,561, United States National Museum Catalogue of 

 Invertebrate Fossils. 



Although well preserved and almost perfect specimens of Chonetes are 

 abundant in the shales of the Hamilton formation at Thedford and Bart- 

 lett's Mills, the number of species of that genus that is represented in 

 these shales is still very doubtful. E. Billings, in his paper "on the 

 Devonian fossils of Canada West," published in 1860, identifies Chonetes 



