WHITEAVE8.] FOSSILS OF HAMILTON FORMATION OF ONTARIO. 409 



CRUSTACEA. 



OSTRAOODA. 

 Primitiopsis punctulifera, Hall. (Sp.) 



Leperditia jmnctuUfeni, Hall. 1860. Thirteenth Rep. N. Y. St. Cab. Nat. Hist., p. 92. 



Ci/therc? jmnctvlifera, Nicholson. 1873. Rep. Pal. Prov. Ont., p. 124. 



Primitiopsis punctulifera, Jones. 1890. Quart. Journ. Geol. Soc. Lond., vol. XLVI., 



pp. 3 and 9, pi. 2, figa. 7, a-h ; 12, a-b ; and 13, a-h. 

 " n Jones. 1891. Contr. to Canad. Micro-Paleeont., p. 95, pi. 11, 



figs. 10 and 11, a-b. 



This little species, which is common at Thedford and its vicinity, 

 where it was first recognized by Prof. H. A. Nicholson, is now referred 

 by Professor T. Rupert Jones to his genus Primitiopsis. 



Ulrichia Conradi, Jones. 



Ulrichia Conradi, Jones. 1890. Quart. Journ. Geol. Soc. Lond., vol. XLVI., p. 544, 

 fig. 2. 

 H Jones. 1891. Contr. to Canad. Micro-Palasont., p. 95, pi. 11, fig. 13. 



The type of this species is a "small left valve" collected at Thedford, 

 by Dr. G. J. Hinde. 



Baeychilina Walcotti, Jones. 



Primitiii (?) Walcotti, Jones. 1890. Quart. Journ. Geol. Soc. Lond., vol. XLVI., p. 



.543, fig. 1. 

 Kirkbyu [?) Walcotti, Jones. 1891. Contr. to Canad. Micro-Palajoiit., p. 90, pi. 11, figs. 



12, a-b. 



In a letter to the writer, dated June 2nd, 1896, Professor Junes sta'es 

 that, the proper name for this species, which was based upon a single im- 

 perfect valve from Thedford collected by Dr. G. J. Hinde, is Barychilina 

 Walcotti. 



PHYLLOPODA. 



Elymocaris Hindei, Jones and Woodward. 



Elymocaris Hindei, Jones and Woodward. 1894. Geol. Mag., N. S., Deo. IV., vol. I., 

 p. 293, pi. 9, fig. 7. 



Arkona, Dr. G. J. Hinde: "two valves of a carapace. The right 

 valve is nearly perfect, but has lost a piece off the hinder end, and is 

 somewhat cracked by pressure. The other valve lies obliquely and 

 partly embedded." 

 4 



