Orthoceras CADMUS, Billings. 



Orthoceras cancellatum, Hall (not Eichwald. ) 1852. Paleeont. of the State 



of N. Y., Vol. II., p. 292, pi. 63, figs. 1 and 

 4a,, b; and pi. 65, figs. 4a. b. 



Orthoceras Cadmus, Billings 1866. Cat. Sil. Foss. of Antioosti, p. 83. 



Orthoceras subcancellatum, Hall 1877. Cat. of Am. Pal. Fossils, by S. A. Mil- 

 ler, p. 245. 



Blora, T. C. Weston, ISGY : a single fragment identified with the 

 above-named species by E. Billings. The types of 0. Cadmus are nor 

 from Anticosti, but from the Niagara formation at Grimsby, Ont. 



Orthoceras annulatum, Sowerby. 



Orthoceras annulatum, Sowerby 1818. Min. Conch. Tab. 133. 



Orthoceralites undulatus, Hismger . .Anteckn. V., Tab. 4, fig. 6, Vet. Akad. Hand- 



lingar, Tab. 7, fig. 8. 

 Orthoceralites undulatus, Hisinger . . Lethea Suecica, 1827, p. 28, Tab. 10, flg. 2. 

 Orthoceras annulatum, Sowerby.-. . . Murchison's Silurian System and Siluria. 



.... Hall, Pal. N.Y., Vol. II., p. 293, pis. 64 and 65. 

 "...." Twentieth Reg. Eep., p. 351, pi. 20, figs, 



4 and 5. 

 " . . . . Hall and Whitf. Pal. Ohio, Vol. II., p. 147. 

 pi. 9, fig. 1. 

 Orthoceras nodocostum,McCh6sney. 1861. New Pal. Foss., p. 94. 



Trans. Chic. Ac. Nat. Sc, p. 53, pi. 9, fig. 5. 

 Orthoceras Laphami, " 1861. New Pal. Foss., p. 91. 



Hespeler, T. C. "Weston, 1867: Blora, one specimen, presented by 

 the Trustees of the School Museum through Mr. David Boyle. 



This species is not uncommon in the ISTiagara formation at Grimsby 

 and St. Catherines, Ont., and one example of it has been found in the 

 " Chaleur Groui^" of L'Anse au Gascon in the Bale des Chalem-s. 



Orthoceras Darwini, Billings. 

 Plate 6, figs. 2 and 2a. 



Orthoceras Darwini, Billings. 1862. Pal. Foss. Canada, Vol, I., p. 101. 



The type of this species, which has not previously been figured, is a 

 very imperfect and badly preserved cast of the interior of part of the 

 septate end of the shell. The siphunole is visible only on the terminal 

 septum of the smaller end, whose supposed ventral surface is partly 

 removed by weathering, so that some allowance should probably be 

 made for Mr. Billings' qualified statement that the centre of its siph- 



