1898] Whiteaves — On SOME Fossil Cephalopoda. 127 



GOMPHOCERAS EXLMIUM, Hall. 



Gomphoceras eximium. Hall. 1861. Fourteenth Reg. Rep. N.Y. 



St. Cab. Nat. Hist., p. 109. 



" " 1876. Illustr. Devon. Fossils : Ce- 



phalopoda, pi. 44, figs. I and 2. 



1879. Pal. N. York, vol. V, pt. 2, 

 p. 329, pi. 44, figs. 1,2: and Sup- 

 plement (1888) p. 32, pi. 120, figs. 

 1-3 ; and pi. 121, figs, i and 2. 



In the Museum of the Survey there are two good specimens 

 of this species, from the Corniferous limestone of St. Marys, one 

 presented by Mr. Blackader, of Montreal, about the year 1879 or 

 1880, and the other obtained through Mr. David Boyle, of 

 Toronto, in 1884. 



GyrOCERAS Numa, Billings. 



Gyroceras Niivia, Billings. 1874. Canad. Xat. and GeoL, N.S., 

 vol. VII, p. 238. 



The type and for many years the only known specimen of 

 this rather obscurely defined species, is a very imperfect cast of 

 the interior of the shell, which is said to be "about 10 inches " 

 in its maximum diameter, from the Corniferous limestone at 

 Kilworth, collected by E. or J. DcCew. In 1884 a somewhat 

 more perfect and rather smaller but otherwise essentially similar 

 specimen, from the Corniferous limestone of Pelee Island, was 

 presented to the Museum of the Survey by the Rev. W. Minter 

 Seaborn. This specimen, which is about seven inches in its 

 maximum diameter, shows that the sutures of the septa are 

 flexuous, and sigmoidally curved on each side ot the shell. The 

 surface markings, and the shape and relative^j^ositioij^^of the 

 siphuncle of G. Niiina are still unknown. 



Ottawa, July 28th, 1898. Afi*/0 ®A^\ 



f!ilLIFRARY|ao 



