-vHiTE*VE8 ] FOSSILS OP HAMILTON FORMATION OF ONTARIO. 38& 



This fine species, which is nob uncommon in the neighbourhood of 

 Thedford, is the type of Hall and Clarke's genus Cyclorhina, published 

 in 1893. 



EUNELLA HARMONIA, Hall. 



TerchratuJa harmonia, YLalX. 1867. Pal. N. York, vol. IV., p. 388, pi. 60, figs. 11— 16. 

 " " Nettelroth. 1889. Kentucky Fossil Shells, Mem. Kent. Geol. 



Surv., p. 154, pi. 17, figs. 1—4. 

 Enndla harnioaia. Hall .-md Clarke. 1893. Pal. N. York, vol. VIII, pt. 2, p. 290, pi. 

 80, figs. 33—35. 



" Middle third of the section at Barblett's Mills," C. Schuchert, 1895 : 

 three specimens which Mr. Schuchert identifies with this species, and 

 which the writer has had the opportunity of studying. 



EuNELLA SIMDLATOR, Hall. 



Terehratula simulator, Hall. 1867. Pal. N. York, vol. IV., p. 391, pi. 60, figs. 69- 70. 

 Eundla nmulator. Hall. 1893. Rep. St. Geol. N. York, vol. II., p. 862, fig. 496; and pL 



52, fig. 29; also fig. 24 of expl. of that plate. 

 Terehratula (Eunella) simulator. Hall and Clarke. 1894. Pal. N. York, vol. VIII., pt. 



2, p. 290, fig. 209. 

 Eunella simulator. Hall and Clarke, 1894. lb., pi. 80, fig. 27, and expl. of that plate. 



The original description and figures of this species were based upon a 

 " specimen received from Dr. Rominger, collected in the Hamilton group 

 at Widder, Canada West," or, as it is now called, at Thedford, Ontario. 

 E. simulator would seem to be quite a rare shell, as it has not been recog- 

 nized by the writer in any of the Survey collections, nor in any of the 

 local collections at Thedford, and Mr. Schuchert did not find it at that 

 locality nor at Bartlett's Mills. 



Eunella attenuata. (N. Sp.) 



Fig. 4. Eunella attenuata. a, Dorsal, and '<, edge view, of an adult 

 specimen, in outline and of twice the natural size. 



Shell elongated, compressed, the maximum thickness through the closed 

 valves being little more than one half of their greatest breadth, narrowly- 



