j:)ne8.] paleozoic ostracoda. 95 



hinder a definite determination of its generic place. It has a faint 

 resemblance in shape to a lai-ge Carboniferous Leperditia of Belgium. 

 In a whitish limestone of Devonian age, with other small obscure 

 organisms, fi'om a small island (Island Z.) on the east side of Lake 

 Winnipegosis, about thirty miles south of Long Point, (yollected by 

 Mr. Tyrrell in 1889. 



7. Ulrichia Conradi, Jones. 



PI. 11, fig. 13. 



Ulrichia Conradi, Jones. Quart. Journ. Geol. Sec, vol. XLVl, 1890, p. 544, wood- 

 cut, fig. 2. 



Length -8 (hinge-line "65), height -45 mm. 



A small, left valve, suboblong, straight on the back, obliquely curved 

 below, rounded at the ends, the posterior higher and fuller than the 

 anterior. Two largish prominent knobs, oval in section and obliquely 

 peaked, divide the dorsal region into three nearly equal portions ; the 

 front tubercle is smaller than the other. The surface of the valve is 

 faintly reticulated, and has along the free borders a neat marginal 

 ridge. 



This small bituberculate and punctate valve is near P. Morgani^ 

 Jones, Q. J. G. S., vol. XLYI, p. 5, pi. iv, fig. 5; but it is more oblong, 

 margined with a distinct raised rim, and has the two tubercles (which 

 take the place of the sulcus of Prlmitia) obliquely peaked. This species 

 was named in memory of T. A. Conrad, who was one of the first to 

 describe the fossil Ostracoda of North America. 



Prom the Hamilton Formation at Thedford (formerly Widder), 

 Ontario, Canada. Collected by Dr. G. J. Ilinde, F.G.S. 



8. Primitiopsis punctulifera (Hall). 

 PI. 11, figs. 10, 11 a, 11 b. 



Leperditia punctulifera, Hall. Thirteenth Report of the Regents of the Univer- 

 sity of New York, 1860, p. 92. 



Primitiopsis punctulifera, Jones. Quart. Journ. Geol. Soc.,.vol. XLVI, 1890, p. P» 



pi. ii, figs. 7, 12, 13. 



The occurrence at Thedford, Ontario, of numerous specimens of 

 Primitiopsis punctulifera (Hall) in various stages of development as to 



